Telit Communications S p A GE864QC2 Quadband GSM/ GPRS Module User Manual GE864 QUAD Hardware User Guide

Telit Communications S.p.A. Quadband GSM/ GPRS Module GE864 QUAD Hardware User Guide

User Manual

GE864-QUAD Hardware User Guide For GE864-QUAD 1vv0300872 Rev.1 2010-04-02
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 2 of 77 APPLICABILITY TABLE PRODUCT GE864-QUAD
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 3 of 77 DISCLAIMER The information contained in this document is the proprietary information of Telit Communications S.p.A. and its affiliates (“TELIT”). The contents are confidential and any disclosure to persons other than the officers, employees, agents or subcontractors of the owner or licensee of this document, without the prior written consent of Telit, is strictly prohibited. Telit makes every effort to ensure the quality of the information it makes available. Notwithstanding the foregoing, Telit does not make any warranty as to the information contained herein, and does not accept any liability for any injury, loss or damage of any kind incurred by use of or reliance upon the information. Telit disclaims any and all responsibility for the application of the devices characterized in this document, and notes that the application of the device must comply with the safety standards of the applicable country, and where applicable, with the relevant wiring rules. Telit reserves the right to make modifications, additions and deletions to this document due to typographical errors, inaccurate information, or improvements to programs and/or equipment at any time and without notice. Such changes will, nevertheless be incorporated into new editions of this document. Copyright: Transmittal, reproduction, dissemination and/or editing of this document as well as utilization of its contents and communication thereof to others without express authorization are prohibited. Offenders will be held liable for payment of damages. All rights are reserved. Copyright © Telit Communications S.p.A. 2010
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 4 of 77 Contents APPLICABILITY TABLE ........................................................................................................................................................ 2 1. INTRODUCTION .................................................................................................................................................... 7 1.1. SCOPE .................................................................................................................................................................... 7 1.2. AUDIENCE............................................................................................................................................................... 7 1.3. CONTACT INFORMATION, SUPPORT ............................................................................................................................. 7 1.4. DOCUMENT ORGANIZATION ....................................................................................................................................... 8 1.5. TEXT CONVENTIONS ................................................................................................................................................. 9 1.6. RELATED DOCUMENTS .............................................................................................................................................. 9 1.7. DOCUMENT HISTORY .............................................................................................................................................. 10 2. OVERVIEW .......................................................................................................................................................... 11 3. GE864 MECHANICAL DIMENSIONS ..................................................................................................................... 12 4. GE864 MODULE CONNECTIONS .......................................................................................................................... 13 4.1. PIN-OUT ........................................................................................................................................................... 13 4.1.1. BGA Balls Layout ................................................................................................................................... 17 5. HARDWARE COMMANDS ................................................................................................................................... 19 5.1. TURNING ON THE GE864-QUAD ........................................................................................................................ 19 5.2. TURNING OFF THE GE864-QUAD ...................................................................................................................... 21 5.2.1. Hardware Unconditional Restart........................................................................................................ 22 6. POWER SUPPLY .................................................................................................................................................. 25 6.1. POWER SUPPLY REQUIREMENTS ......................................................................................................................... 25 6.2. GENERAL DESIGN RULES .................................................................................................................................... 27 6.2.1. Electrical Design Guidelines ............................................................................................................... 27 6.2.1.1. +5V input Source Power Supply Design Guidelines ............................................................................................... 27 6.2.1.2. +12V input Source Power Supply Design Guidelines ............................................................................................. 28 6.2.1.3. Battery Source Power Supply Design Guidelines ................................................................................................... 30 6.2.1.4. Battery Charge Control Circuitry Design Guidelines .............................................................................................. 30 6.2.2. Thermal Design Guidelines ................................................................................................................. 32 6.2.3. Power Supply PCB Layout Guidelines................................................................................................ 33 7. ANTENNA ........................................................................................................................................................... 35 7.1. GSM ANTENNA REQUIREMENTS .......................................................................................................................... 35 7.2. GSM ANTENNA – PCB LINE GUIDELINES ............................................................................................................ 36 7.3. GSM ANTENNA – INSTALLATION GUIDELINES ...................................................................................................... 37 8. LOGIC LEVEL SPECIFICATIONS ............................................................................................................................. 38 8.1. RESET SIGNAL .................................................................................................................................................... 39 9. SERIAL PORTS ..................................................................................................................................................... 40 9.1. MODEM SERIAL PORT .......................................................................................................................................... 40 9.2. RS232 LEVEL TRANSLATION .............................................................................................................................. 42 9.3. 5V UART LEVEL TRANSLATION........................................................................................................................... 44 10. AUDIO SECTION OVERVIEW ........................................................................................................................... 46
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 5 of 77 1.1 SELECTION MODE .......................................................................................................................................................... 46 1.2 ELECTRICAL CHARACTERISTICS .......................................................................................................................................... 48 10.1.1. Input Lines Characteristics ................................................................................................................. 48 1.2.1 Output Lines Characteristics ....................................................................................................................... 49 11. EXTERNAL SIM HOLDER IMPLEMENTATION ................................................................................................... 51 12. GENERAL PURPOSE I/O .................................................................................................................................. 52 12.1. GPIO LOGIC LEVELS ....................................................................................................................................... 54 12.2. USING A GPIO PAD AS INPUT ........................................................................................................................ 55 12.3. USING A GPIO PAD AS OUTPUT .................................................................................................................... 55 12.4. USING THE RF TRANSMISSION CONTROL GPIO4 .............................................................................................. 55 12.5. USING THE RFTXMON OUTPUT GPIO5 .......................................................................................................... 55 12.6. USING THE ALARM OUTPUT GPIO6 ................................................................................................................. 56 12.7. USING THE BUZZER OUTPUT GPIO7 ................................................................................................................ 57 12.8. MAGNETIC BUZZER CONCEPTS......................................................................................................................... 58 12.8.1. Short Description .................................................................................................................................. 58 12.8.2. Frequency Behavior.............................................................................................................................. 59 12.8.3. Power Supply Influence ....................................................................................................................... 59 12.8.4. Working Current Influence .................................................................................................................. 59 12.9. USING THE TEMPERATURE MONITOR FUNCTION ............................................................................................... 60 12.9.1. Short Description .................................................................................................................................. 60 12.9.2. Allowed GPIO ......................................................................................................................................... 60 12.10. INDICATION OF NETWORK SERVICE AVAILABILITY ............................................................................................. 61 12.11. RTC BYPASS OUT ........................................................................................................................................... 62 12.12. VAUX1 POWER OUTPUT ................................................................................................................................. 62 13. DAC AND ADC SECTION .................................................................................................................................. 63 13.1. DAC CONVERTER ............................................................................................................................................ 63 13.1.1. Description ............................................................................................................................................. 63 13.1.2. Enabling DAC .......................................................................................................................................... 63 13.1.3. Low Pass Filter Example ..................................................................................................................... 64 13.2. ADC CONVERTER ............................................................................................................................................ 64 13.2.1. Description ............................................................................................................................................. 64 13.2.2. Using ADC Converter ............................................................................................................................ 64 14. MOUNTING THE GE864 ON THE BOARD ......................................................................................................... 65 14.1. GENERAL ........................................................................................................................................................ 65 14.1.1. Module Finishing & Dimensions ......................................................................................................... 65 14.1.2. Recommended Foot Print for the Application (GE864) ................................................................... 66 14.1.3. Suggested Inhibit Area ......................................................................................................................... 67 14.1.4. Debug of the GE864 in Production ...................................................................................................... 68 14.1.5. Stencil ..................................................................................................................................................... 68 14.1.6. PCB Pad Design ..................................................................................................................................... 68 14.1.7. Solder Paste ........................................................................................................................................... 69 14.1.8. GE864 Solder Reflow ............................................................................................................................ 70 14.2. PACKING SYSTEM ........................................................................................................................................... 71 GE864 Orientation on the Tray ............................................................................................................................. 72 14.2.1. Moisture Sensibility .............................................................................................................................. 73
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 6 of 77 15. CONFORMITY ASSESSMENT ISSUES ................................................................................................................ 74 16. SAFETY RECOMMENDATIONS ........................................................................................................................ 76
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 7 of 77 1. Introduction 1.1. Scope The aim of this document is the description of some hardware solutions useful for developing a product with the Telit GE864-QUAD module. 1.2. Audience This document is intended for Telit customers, who are integrators, about to implement their applications using our GE864 modules. 1.3. Contact Information, Support For general contact, technical support, to report documentation errors and to order manuals, contact Telit’s Technical Support Center (TTSC) at: TS-EMEA@telit.com TS-NORTHAMERICA@telit.com TS-LATINAMERICA@telit.com TS-APAC@telit.com Alternatively, use: http://www.telit.com/en/products/technical-support-center/contact.php For detailed information about where you can buy the Telit modules or for recommendations on accessories and components visit: http://www.telit.com To register for product news and announcements or for product questions contact Telit’s Technical Support Center (TTSC). Our aim is to make this guide as helpful as possible. Keep us informed of your comments and suggestions for improvements. Telit appreciates feedback from the users of our information.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 8 of 77 1.4. Document Organization This document contains the following chapters: provides a scope for this document, target audience, contact and support information, and text conventions. Ch provides an overview of the document. 864 Chapter 4 864 deals with the pin out configuration and layout. How to operate on the module via hardware. Power supply requirements and general design rules. The antenna connection and board layout design are the most important parts in the full product design. Specific values adopted in the implementation of logic levels for this module. The serial port on the Telit GE864 is the core of the interface between the module and OEM hardware Refers to the audio blocks of the Base Band Chip of the GE864 Telit Modules. How the general purpose I/O pads can be configured. Deals with these two kind of converters. g the GE864 Recommendations and
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 9 of 77 1.5. Text Conventions Danger – This information MUST be followed or catastrophic equipment failure or bodily injury may occur. Caution or Warning – Alerts the user to important points about integrating the module, if these points are not followed, the module and end user equipment may fail or malfunction. Tip or Information – Provides advice and suggestions that may be useful when integrating the module. All dates are in ISO 8601 format, i.e. YYYY-MM-DD. 1.6. Related Documents Telit's GSM/GPRS Family Software User Guide, 1vv0300784 Audio settings application note , 80000NT10007a Digital voice Interface Application Note, 80000NT10004a GE864 Product description SIM Holder Design Guides, 80000NT10001a AT Commands Reference Guide, 80000ST10025a
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 10 of 77 1.7. Document History RReevviissiioonn DDaattee CChhaannggeess ISSUE#0 2010-01-18 Release First ISSUE# 0 ISSUE#1 2010-04-02 Added FCC documentation
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 11 of 77 2. Overview In this document all the basic functions of a mobile phone will be taken into account; for each one of them a proper hardware solution will be suggested and eventually the wrong solutions and common errors to be avoided will be evidenced. Obviously this document cannot embrace the whole hardware solutions and products that may be designed. The wrong solutions to be avoided shall be considered as mandatory, while the suggested hardware configurations shall not be considered mandatory, instead the information given shall be used as a guide and a starting point for properly developing your product with the Telit GE864-QUAD module. For further hardware details that may not be explained in this document refer to the Telit GE864-QUAD Product Description document where all the hardware information is reported. NOTICE: The integration of the GSM/GPRS GE864-QUAD cellular module within user application shall be done according to the design rules described in this manual. The information presented in this document is believed to be accurate and reliable. However, no responsibility is assumed by Telit Communications S.p.A. for its use, nor any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of Telit Communications S.p.A. other than for circuitry embodied in Telit products. This document is subject to change without notice.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 12 of 77 3. GE864 Mechanical Dimensions The Telit GE864 module overall dimensions are: Length: 30 mm Width: 30 mm Thickness: 2.9 mm
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 13 of 77 4. GE864 Module Connections 4.1. PIN-OUT Ball Signal I/O Function Internal PULL UP Type Audio H9 EAR_MT- AO Handset earphone signal output, phase - Audio G10 EAR_MT+ AO Handset earphone signal output, phase + Audio H10 EAR_HF+ AO Handsfree ear output, phase + Audio J10 EAR_HF- AO Handsfree ear output, phase - Audio J8 MIC_MT+ AI Handset mic.signal input; phase+ Audio G9 MIC_MT- AI Handset mic.signal input; phase- Audio G8 MIC_HF+ AI Handsfree mic. input; phase + Audio J9 MIC_HF- AI Handsfree mic.input; phase - Audio F9 AXE I Handsfree switching 100K CMOS 2.8V SIM card interface C10 SIMCLK O External SIM signal Clock 1,8 / 3V E9 SIMRST O External SIM signal Reset 1,8 / 3V D10 SIMIO I/O External SIM signal Data I/O 1,8 / 3V C11 SIMIN I External SIM signal Presence (active low) 47K 1,8 / 3V D41 SIMVCC - External SIM signal Power supply for the SIM 1,8 / 3V Trace D11 TX_TRACE O TX Data for debug monitor CMOS 2.8V F10 RX_TRACE I RX Data for debug monitor CMOS 2.8V Prog. / Data + HW Flow Control E7 C103/TXD I Serial data input (TXD) from DTE CMOS 2.8V H8 C104/RXD O Serial data output to DTE CMOS 2.8V B7 C108/DTR I Input for Data terminal ready signal (DTR) from DTE CMOS 2.8V F7 C105/RTS I Input for Request to send signal (RTS) from DTE CMOS 2.8V F6 C106/CTS O Output for Clear to send signal (CTS) to DTE CMOS 2.8V D9 C109/DCD O Output for Data carrier detect signal (DCD) to DTE CMOS 2.8V E11 C107/DSR O Output for Data set ready signal (DSR) to DTE CMOS 2.8V B6 C125/RING O Output for Ring indicator signal (RI) to DTE CMOS 2.8V DAC and ADC C7 DAC_OUT AO Digital/Analog converter output D/A J11 ADC_IN1 AI Analog/Digital converter input A/D H11 ADC_IN2 AI Analog/Digital converter input A/D G11 ADC_IN3 AI Analog/Digital converter input A/D Miscellaneous Functions A2 RESET* I Reset input 1 On this line a maximum of 10nF bypass capacitor is allowed
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 14 of 77 Ball Signal I/O Function Internal PULL UP Type E2 VRTC AO VRTC Backup capacitor Power D8 STAT_LED O Status indicator led CMOS 1.8V G1 CHARGE AI Charger input Power G2 CHARGE AI Charger input Power J5 ON_OFF* I Input command for switching power ON or OFF (toggle command). 47K Pull up to VBATT D5 VAUX1 - Power output for external accessories - L8 PWRMON O Power ON Monitor CMOS 2.8V L4 Antenna O Antenna output 50 ohm RF D7 DVI2_CLK - DVI2_CLK (Digital Voice Interface) 4.7K CMOS 2.8 C6 DVI1_TX - Digital Transmitting Data 4.7K CMOS 2.8 GPIO G4 TGPIO_12 I/O Telit GPIO12 Configurable GPIO CMOS 2.8V C2 TGPIO_03 I/O Telit GPIO03 Configurable GPIO CMOS 2.8V B3 TGPIO_04 I/O Telit GPIO04 Configurable GPIO / RF Transmission Control CMOS 2.8V C3 TGPIO_20 I/O Telit GPIO20 Configurable GPIO CMOS 2.8V B4 TGPIO_14 I/O Telit GPIO14 Configurable GPIO CMOS 2.8V D1 TGPIO_11 I/O Telit GPIO11 Configurable GPIO CMOS 2.8V B1 TGPIO_19 I/O Telit GPIO19 Configurable GPIO CMOS 2.8V C1 TGPIO_01 I/O Telit GPIO01 Configurable GPIO CMOS 2.8V K7 TGPIO_18 I/O Telit GPIO18 Configurable GPIO/ DVI2_RX (Digital Voice Interface) CMOS 2.8V H5 TGPIO_17 I/O Telit GPIO17 Configurable GPIO / DVI2_WA (Digital Voice Interface) CMOS 2.8V F5 TGPIO_15 I/O Telit GPIO15 Configurable GPIO CMOS 2.8V K11 TGPIO_08 I/O Telit GPIO08 Configurable GPIO CMOS 2.8V B5 TGPIO_06 / ALARM I/O Telit GPIO06 Configurable GPIO / ALARM CMOS 2.8V C9 TGPIO_09 I/O Telit GPIO09 GPIO I/O pin CMOS 2.8V E6 TGPIO_02 / JDR I/O Telit GPIO02 I/O pin / Jammer detect report CMOS 2.8V L9 TGPIO_07 / BUZZER I/O Telit GPIO07 Configurable GPIO / Buzzer CMOS 2.8V H6 TGPIO_16 I/O Telit GPIO16 Configurable GPIO CMOS 2.8V K10 TGPIO_13 I/O Telit GPIO13 Configurable GPIO CMOS 2.8V K8 TGPIO_05 / RFTXMON I/O Telit GPIO05 Configurable GPIO / Transmitter ON monitor CMOS 2.8V L10 TGPIO_21 I/O Telit GPIO21 Configurable GPIO CMOS 2.8V E8 TGPIO_22 I/O Telit GPIO22 Configurable GPIO CMOS 1.8V (not 2.8V !!) H3 TGPIO_10 I/O Telit GPIO10 Configurable GPIO / DVI2_TX (Digital Voice Interface) CMOS 2.8V Power Supply J1 VBATT - Main power supply Power K1 VBATT - Main power supply Power J2 VBATT - Main power supply Power K2 VBATT - Main power supply Power A1 GND - Ground Power
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 15 of 77 Ball Signal I/O Function Internal PULL UP Type F1 GND - Ground Power H1 GND - Ground Power L1 GND - Ground Power H2 GND - Ground Power L2 GND - Ground Power J3 GND - Ground Power K3 GND - Ground Power L3 GND - Ground Power K4 GND - Ground Power K5 GND - Ground Power D6 GND - Ground Power K6 GND - Ground Power L6 GND - Ground Power A11 GND - Ground Power F11 GND - Ground Power L11 GND - Ground Power RESERVED A10 - A3 - A4 - A5 - A6 - A7 - A8 - A9 - B10 - B11 - B2 - B8 - B9 - C4 - C8 - D2 - D3 - E1 - E10 - E3 - E4 - F2 - F3 - F4 - G6 - G7 - H4 -
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 16 of 77 Ball Signal I/O Function Internal PULL UP Type H7 - J4 - J6 - J7 - K9 - L5 - E5 - L7 - G5 - G3 - F8 - C5 - NOTE: The GE864-QUAD has one DVI port on the system interface. the DVI2 port as this minimizes the impact on the module functionality. NOTE: RESERVED pins must not be connected NOTE: If not used, almost all pins must be left disconnected. The only exceptions are the following pins2: 2 RTS should be connected to the GND (on the module side) if flow control is not used. pin signal J1,K1,J2,K2 VBATT A1,F1,H1,L1,H2,L2,J3,K3,L3, K4,K5,D6,K6,L6,A11,F11,L11 GND J5 ON/OFF* E7 TXD A2 RESET* H8 RXD F7 RTS
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 17 of 77 4.1.1. BGA Balls Layout Top view A B C D E F G H J K L 1 GND TGPIO_19 TGPIO_01 TGPIO_11 - GND CHARGE GND VBATT VBATT GND 2 RESET* - TGPIO_03 - VRTC - CHARGE GND VBATT VBATT GND 3 - TGPIO_04 TGPIO_20 - - - - TGPIO_10 GND GND GND 4 -- TGPIO_14 - SIMVCC - - TGPIO_12 - - GND Antenna 5 - TGPIO_06 / ALARM VAUX1 - TGPIO_15 - TGPIO_17 ON_OFF* GND - 6 - C125/RING GND TGPIO_02 / JDR C106 / CTS - TGPIO_16 - GND GND 7 - C108 / DTR DAC_OUT DVI2_CLK C103 / TXD C105 / RTS - - - TGPIO_18 - 8 - - - STAD_ LED TGPIO_22 - MIC_HF+ C104 / RXD MIC_MT+ TGPIO_05 / RFTXMON PWRMON 9 - - TGPIO_09 C109 / DCD SIMRST AXE MIC_MT- EAR_MT- MIC_HF- - TGPIO_07 / BUZZER 10 - - SIMCLK SIMIO - RX_TRACE EAR_MT+ EAR_HF+ EAR_HF- TGPIO_13 TGPIO_21 11 GND - SIMIN TX_TRACE C107 / DSR GND ADC_IN3 ADC_IN2 ADC_IN1 TGPIO_08 GND
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 18 of 77 AUDIO Signals balls SIM CARD interface balls TRACE Signals balls Prog. / data + Hw Flow Control signals balls DAC and ADC signals balls MISCELLANEOUS functions signals balls TELIT GPIO balls POWER SUPPLY VBATT balls POWER SUPPLY GND balls RESERVED
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 19 of 77 5. Hardware Commands 5.1. Turning ON the GE864-QUAD To turn on the GE864-QUAD the pad ON# must be tied low for at least 1 second and then released. The maximum current that can be drained from the ON# pad is 0,1 mA. A simple circuit to do it is: NOTE: Do not use any pull up resistor on the ON# line, it is internally pulled up. Using pull up resistor may bring to latch up problems on the GE864-QUAD power regulator and improper power on/off of the module. The line ON# must be connected only in open collector configuration. NOTE: In this document all the lines that are inverted, hence have active low signals are labeled with a name that ends with a “#” or with a bar over the name. NOTE: The GE864-QUAD turns fully on also by supplying power to the Charge pad (Module provided with a battery on the VBATT pads).
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 20 of 77 A flow chart showing the proper turn on procedure is displayed below: TIP: To check if the device has powered on, the hardware line PWRMON must be monitored. After 900ms the line raised up the device could be considered powered on. PWRMON line rises up also when supplying power to the Charge pad
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 21 of 77 For example: Let us assume you need to drive the ON# pad with a totem pole output of a +3/5 V micro controller (uP_OUT1): Let us assume you need to drive the ON# pad directly with an ON/OFF button: 5.2. Turning OFF the GE864-QUAD The turning off of the device can be done in two ways: via AT command (see GE864-QUAD Software User Guide) by tying low pin ON# Either ways, when the device issues a detach request to the network informing that the device will not be reachable any more. To turn OFF the GE864-QUAD the pad ON# must be tied low for at least 2 seconds and then released. The same circuitry and timing for the power on shall be used. The device shuts down after the release of the ON# pad.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 22 of 77 TIP: To check if the device has powered off, the hardware line PWRMON must be monitored. When PWRMON goes low, the device has powered off. 5.2.1. Hardware Unconditional Restart WARNING: The hardware unconditional Restart must not be used during normal operation of the device since it does not detach the device from the network. It shall be kept as an emergency exit procedure to be done in the rare case that the device gets stacked waiting for some network or SIM responses. To unconditionally restart the GE864-QUAD, the pad RESET# must be tied low for at least 200 milliseconds and then released. The maximum current that can be drained from the ON# pad is 0.15 mA.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 23 of 77 A simple circuit to do it is: NOTE: Do not use any pull up resistor on the RESET# line nor any totem pole digital output. Using pull up resistor may bring to latch up problems on the GE864-QUAD power regulator and improper functioning of the module. The line RESET# must be connected only in open collector configuration. TIP: The unconditional hardware Restart must always be implemented on the boards and must be used by the software as an emergency exit procedure.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 24 of 77 The following flow chart shows the proper Reset procedure: For example: Let us assume you need to drive the RESET# pad with a totem pole output of a +3/5 V microcontroller (uP_OUT2): This signal is internally pulled up so the pin can be left floating if not used.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 25 of 77 6. Power Supply The power supply circuitry and board layout are a very important part in the full product design and they strongly reflect on the product overall performances, hence read carefully the requirements and the guidelines that will follow for a proper design. 6.1. Power Supply Requirements POWER SUPPLY Nominal Supply Voltage 3.8 V Normal Operating Voltage Range 3.4 V÷ 4.20 V Extended Operating Voltage Range 3.22 V÷ 4.50 V NOTE: The Operating Voltage Range MUST never be exceeded; care must be taken in order to fulfil min/max voltage requirement. NOTE: Overshoot voltage (regarding MAX Extended Operating Voltage) and drop in voltage (regarding MIN Extended Operating Voltage) MUST never be exceeded; The “Extended Operating Voltage Range” can be used only with completely assumption and application of the HW User guide suggestions.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 26 of 77 The table below shows the mod power consumptions: GE864-QUAD Mode Average (mA) Mode description SWITCHED OFF Module supplied but Switched Off Switched Off <62uA IDLE mode AT+CFUN=1 19,0 Normal mode: full functionality of the module AT+CFUN=4 18,0 Disabled TX and RX; module is not registered on the network AT+CFUN=0 or =5 3,9 Paging Multiframe 2 2,9 Paging Multiframe 4 2,1 Paging Multiframe 6 1,9 Paging Multiframe 8 1,6 Paging Multiframe 9 CSD TX and RX mode GSM VOICE CALL GSM900 CSD PL5 305,0 DCS1800 CSD PL0 208,0 GPRS (class 10) 1TX GPRS Sending data mode GSM900 PL5 264,0 DCS1800 PL0 176,0 GPRS (class 10) 2TX GPRS Sending data mode GSM900 PL5 473,8 DCS1800 PL0 307,8 The GSM system is made in a way that the RF transmission is not continuous, else it is packed into bursts at a base frequency of about 216 Hz, the relative current peaks can be as high as about 2A. Therefore the power supply has to be designed in order to withstand with these current peaks without big voltage drops; this means that both the electrical design and the board layout must be designed for this current flow. If the layout of the PCB is not well designed a strong noise floor is generated on the ground and the supply; this will reflect on all the audio paths producing an audible annoying noise at 216 Hz; if the voltage drop during the peak current absorption is too much, then the device may even shutdown as a consequence of the supply voltage drop. TIP: The power supply must be designed so that it is capable of a peak current output of at least 2 A.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 27 of 77 6.2. General Design Rules The principal guidelines for the Power Supply Design embrace three different design steps: the electrical design the thermal design the PCB layout. 6.2.1. Electrical Design Guidelines The electrical design of the power supply depends strongly from the power source where this power is drained. We will distinguish them into three categories: +5V input (typically PC internal regulator output) +12V input (typically automotive) Battery 6.2.1.1. +5V input Source Power Supply Design Guidelines The desired output for the power supply is 3.8V, hence there is not a big difference between the input source and the desired output and a linear regulator can be used. A switching power supply will not be suited because of the low drop out requirements. When using a linear regulator, a proper heat sink shall be provided in order to dissipate the power generated. A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks close to the GE864-QUAD, a 100μF tantalum capacitor is usually suited. Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is rated at least 10V. A protection diode must be inserted close to the power input, in order to save the GE864-QUAD from power polarity inversion.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 28 of 77 An example of linear regulator with 5V input is: 6.2.1.2. +12V input Source Power Supply Design Guidelines The desired output for the power supply is 3.8V; hence due to the big difference between the input source and the desired output, a linear regulator is not suited and shall not be used. A switching power supply will be preferable because of its better efficiency especially with the 2A peak current load represented by the GE864-QUAD. When using a switching regulator, a 500kHz or more switching frequency regulator is preferable because of its smaller inductor size and its faster transient response. This allows the regulator to respond quickly to the current peaks absorption. In any case the frequency and Switching design selection is related to the application to be developed due to the fact the switching frequency could also generate EMC interferences. For car PB battery the input voltage can rise up to 15.8V and this must be kept in mind when choosing components: all components in the power supply must withstand this voltage. A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks, a 100μF tantalum capacitor is usually suited.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 29 of 77 Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is rated at least 10V. For Car applications a spike protection diode must be inserted close to the power input, in order to clean the supply from spikes. A protection diode must be inserted close to the power input, in order to save the GE864-QUAD from power polarity inversion. This can be the same diode as for spike protection. An example of switching regulator with 12V input is in the below schematic (it is split in 2 parts):
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 30 of 77 6.2.1.3. Battery Source Power Supply Design Guidelines The desired nominal output for the power supply is 3.8V and the maximum voltage allowed is 4.5 V , hence a single 3.7V Li-Ion cell battery type is suited for supplying the power to the Telit GE864-QUAD module. CAUTION: The three cells Ni/Cd or Ni/MH 3,6 V Nom. battery types or 4V PB types MUST NOT BE USED DIRECTLY since their maximum voltage can rise over the absolute maximum voltage for the GE864-QUAD and damage it. CAUTION: DO NOT USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with GE864-QUAD. Their use can lead to overvoltage on the GE864-QUAD and damage it. USE ONLY Li-Ion battery types. A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks, a 100μF tantalum capacitor is usually suited. Make sure the low ESR capacitor (usually a tantalum one) is rated at least 10V. A protection diode must be inserted close to the power input, in order to save the GE864-QUAD from power polarity inversion. Otherwise the battery connector must be done in a way to avoid polarity inversions when connecting the battery. The battery capacity must be at least 500mAh in order to withstand the current peaks of 2A; the suggested capacity is from 500mAh to 1000mAh. 6.2.1.4. Battery Charge Control Circuitry Design Guidelines The charging process for Li-Ion Batteries can be divided into 4 phases: Qualification and trickle charging Fast charge 1 – constant current Final charge – constant voltage or pulsed charging Maintenance charge The qualification process consists in a battery voltage measure, indicating roughly its charge status. If the battery is deeply discharged, that means its voltage is lower than the trickle charging threshold, then the charge must start slowly possibly with a current limited pre-charging process where the current is kept very low with respect to the fast charge value: the trickle charging. During the trickle charging the voltage across the battery terminals rises; when it reaches the fast charge threshold level the charging process goes into fast charge phase.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 31 of 77 During the fast charge phase the process proceeds with a current limited charging; this current limit depends on the required time for the complete charge and from the battery pack capacity. During this phase the voltage across the battery terminals still raises but at a lower rate. Once the battery voltage reaches its maximum voltage then the process goes into its third state: Final charging. The voltage measure to change the process status into final charge is very important. It must be ensured that the maximum battery voltage is never exceeded, otherwise the battery may be damaged and even explode. Moreover for the constant voltage final chargers, the constant voltage phase (final charge) must not start before the battery voltage has reached its maximum value, otherwise the battery capacity will be highly reduced. The final charge can be of two different types: constant voltage or pulsed. GE864-QUAD uses constant voltage. The constant voltage charge proceeds with a fixed voltage regulator (very accurately set to the maximum battery voltage) and hence the current will decrease while the battery is becoming charged. When the charging current falls below a certain fraction of the fast charge current value, then the battery is considered fully charged, the final charge stops and eventually starts the maintenance. The pulsed charge process has no voltage regulation, instead the charge continues with pulses. Usually the pulse charge works in the following manner: the charge is stopped for some time, let us say few hundreds of ms, then the battery voltage will be measured and when it drops below its maximum value a fixed time length charging pulse is issued. As the battery approaches its full charge the off time will become longer, hence the duty-cycle of the pulses will decrease. The battery is considered fully charged when the pulse duty-cycle is less than a threshold value, typically 10%, the pulse charge stops and eventually the maintenance starts. The last phase is not properly a charging phase, since the battery at this point is fully charged and the process may stop after the final charge. The maintenance charge provides an additional charging process to compensate for the charge leak typical of a Li-Ion battery. It is done by issuing pulses with a fixed time length, again few hundreds of ms, and a duty-cycle around 5% or less. This last phase is not implemented in the GE864-QUAD internal charging algorithm, so that the battery once charged is left discharging down to a certain threshold so that it is cycled from full charge to slight discharge even if the battery charger is always inserted. This guarantees that anyway the remaining charge in the battery is a good percentage and that the battery is not damaged by keeping it always fully charged (Li-Ion rechargeable battery usually deteriorates when kept fully charged). Last but not least, in some applications it is highly desired that the charging process restarts when the battery is discharged and its voltage drops below a certain threshold, GE864-QUAD internal charger does it.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 32 of 77 As you can see, the charging process is not a trivial task to be done; moreover all these operations must start only if battery temperature is inside a charging range, usually 5°C – 45°C. The GE864-QUAD measures the temperature of its internal component, in order to satisfy this last requirement, it is not exactly the same as the battery temperature but in common application the two temperature must not differ too much and the charging temperature range must be guaranteed. NOTE: For all the threshold voltages, inside the GE864-QUAD all thresholds are fixed in order to maximize Li-Ion battery performances and do not need to be changed. NOTE: In this application the battery charger input current must be limited to less than 400mA. This can be done by using a current limited wall adapter as the power source. NOTE: When starting the charger from Module powered off the startup will be in CFUN4; to activate the normal mode a command AT+CFUN=1 has to be provided. This is also possible using the POWER ON. There is also the possibility to activate the normal mode using the ON_OFF* signal. In this case, when HW powering off the module with the same line (ON_OFF*) and having the charger still connected, the module will go back to CFUN4. NOTE: It is important having a 100uF Capacitor to VBAT in order to avoid instability of the charger circuit if the battery is accidentally disconnected during the charging activity. 6.2.2. Thermal Design Guidelines The thermal design for the power supply heat sink must be done with the following specifications: Average current consumption during transmission @ max PWR level: 500mA Average current consumption during transmission @ min PWR level: 100mA Average current during Power Saving (CFUN=5): 4mA Average current during idle (Power Saving disabled): 24mA
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 33 of 77 NOTE: The average consumption during transmissions depends on the power level at which the device is requested to transmit by the network. The average current consumption hence varies significantly. Considering the very low current during idle, especially if Power Saving function is enabled, it is possible to consider from the thermal point of view that the device absorbs current significantly only during calls. If we assume that the device stays into transmission for short periods of time (let us say few minutes) and then remains for a quite long time in idle (let us say one hour), then the power supply has always the time to cool down between the calls and the heat sink could be smaller than the calculated one for 500mA maximum RMS current, or even could be the simple chip package (no heat sink). Moreover in the average network conditions the device is requested to transmit at a lower power level than the maximum and hence the current consumption will be less than the 500mA, being usually around 150mA. For these reasons the thermal design is rarely a concern and the simple ground plane where the power supply chip is placed can be enough to ensure a good thermal condition and avoid overheating. For the heat generated by the GE864-QUAD, you can consider it to be during transmission 1W max during CSD/VOICE calls and 2W max during class10 GPRS upload. This generated heat will be mostly conducted to the ground plane under the GE864-QUAD; you must ensure that your application can dissipate it. 6.2.3. Power Supply PCB Layout Guidelines As seen on the electrical design guidelines the power supply shall have a low ESR capacitor on the output to cut the current peaks and a protection diode on the input to protect the supply from spikes and polarity inversion. The placement of these components is crucial for the correct working of the circuitry. A misplaced component can be useless or can even decrease the power supply performances. The Bypass low ESR capacitor must be placed close to the Telit GE864-QUAD power input pads or in the case the power supply is a switching type it can be placed close to the inductor to cut the ripple provided the PCB trace from the capacitor to the GE864-QUAD is wide enough to ensure a dropless connection even during the 2A current peaks.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 34 of 77 The protection diode must be placed close to the input connector where the power source is drained. The PCB traces from the input connector to the power regulator IC must be wide enough to ensure no voltage drops occur when the 2A current peaks are absorbed. Note that this is not made in order to save power loss but especially to avoid the voltage drops on the power line at the current peaks frequency of 216 Hz that will reflect on all the components connected to that supply, introducing the noise floor at the burst base frequency. For this reason while a voltage drop of 300-400 mV may be acceptable from the power loss point of view, the same voltage drop may not be acceptable from the noise point of view. If your application does not have audio interface but only uses the data feature of the Telit GE864-QUAD, then this noise is not so disturbing and power supply layout design can be more forgiving. The PCB traces to the GE864-QUAD and the Bypass capacitor must be wide enough to ensure no significant voltage drops occur when the 2A current peaks are absorbed. This is for the same reason as previous point. Try to keep this trace as short as possible. The PCB traces connecting the Switching output to the inductor and the switching diode must be kept as short as possible by placing the inductor and the diode very close to the power switching IC (only for switching power supply). This is done in order to reduce the radiated field (noise) at the switching frequency (100-500 kHz usually). The use of a good common ground plane is suggested. The placement of the power supply on the board must be done in such a way to guarantee that the high current return paths in the ground plane are not overlapped to any noise sensitive circuitry as the microphone amplifier/buffer or earphone amplifier. The power supply input cables must be kept separate from noise sensitive lines such as microphone/earphone cables.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 35 of 77 7. Antenna The antenna connection and board layout design are the most important part in the full product design and they strongly reflect on the product overall performances, hence read carefully and follow the requirements and the guidelines for a proper design. 7.1. GSM Antenna Requirements As suggested on the Product Description the antenna and antenna line on PCB for a Telit GE864-QUAD device shall fulfill the following requirements: ANTENNA REQUIREMENTS Frequency range Depending by frequency band(s) provided by the network operator, the customer shall use the most suitable antenna for that/those band(s) Bandwidth 70 MHz in GSM850, 80 MHz in GSM900, 170 MHz in DCS & 140 MHz PCS band Gain Gain < 3dBi Impedance 50 Ω Input power > 2 W peak power VSWR absolute max <= 10:1 VSWR recommended <= 2:1 When using the Telit GE864-QUAD, since there is no antenna connector on the module, the antenna must be connected to the GE864-QUAD through the PCB with the antenna pad. In the case that the antenna is not directly developed on the same PCB, hence directly connected at the antenna pad of the GE864-QUAD, then a PCB line is needed in order to connect with it or with its connector. This line of transmission shall fulfill the following requirements: ANTENNA LINE ON PCB REQUIREMENTS Impedance 50 Ω Max Attenuation 0,3 dB No coupling with other signals allowed Cold End (Ground Plane) of antenna shall be equipotential to the GE864-QUAD ground pins
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 36 of 77 Furthermore if the device is developed for the US market and/or Canada market, it shall comply to the FCC and/or IC approval requirements: This device is to be used only for mobile and fixed application. The antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter. End-Users must be provided with transmitter operation conditions for satisfying RF exposure compliance. OEM integrators must ensure that the end user has no manual instructions to remove or install the GE864-QUAD module. Antennas used for this OEM module must not exceed 3dBi gain for mobile and fixed operating configurations. 7.2. GSM Antenna PCB Line Guidelines Ensure that the antenna line impedance is 50Ω; Keep the antenna line on the PCB as short as possible, since the antenna line loss shall be less than 0,3 dB; Antenna line must have uniform characteristics, constant cross section, avoid meanders and abrupt curves; Keep, if possible, one layer of the PCB used only for the Ground plane; Surround (on the sides, over and under) the antenna line on PCB with Ground, avoid having other signal tracks facing directly the antenna line track; The ground around the antenna line on PCB has to be strictly connected to the Ground Plane by placing vias once per 2mm at least; Place EM noisy devices as far as possible from GE864-QUAD antenna line; Keep the antenna line far away from the GE864-QUAD power supply lines; If you have EM noisy devices around the PCB hosting the GE864-QUAD such as fast switching ICs, take care of the shielding of the antenna line by burying it inside the layers of PCB and surround it with Ground planes, or shield it with a metal frame cover. If you do not have EM noisy devices around the PCB of GE864-QUAD, by using a strip-line on the superficial copper layer for the antenna line, the line attenuation will be lower than a buried one;
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 37 of 77 7.3. GSM Antenna Installation Guidelines Install the antenna in a place covered by the GSM signal. The Antenna must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter; Antenna shall not be installed inside metal cases Antenna shall be installed also according Antenna manufacturer instructions.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 38 of 77 8. Logic Level Specifications Where not specifically stated, all the interface circuits work at 2.8V CMOS logic levels. The following table shows the logic level specifications used in the Telit GE864-QUAD interface circuits: Absolute Maximum Ratings –Not Functional Parameter Min Max Input level on any digital pin when on -0.3V +3.6V Input voltage on analog pins when on -0.3V +3.0 V Operating Range – Interface Levels (2.8V CMOS) Level Min Max Input high level 2.1V 3.3V Input low level 0V 0.5V Output high level 2.2V 3.0V Output low level 0V 0.35V For 1.8V signals: Operating Range – Interface Levels (1.8V CMOS) Level Min Max Input high level 1.6V 2.2V Input low level 0V 0.4V Output high level 1,65V 2.2V Output low level 0V 0.35V Current Characteristics Level Typical Output Current 1mA Input Current 1uA
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 39 of 77 8.1. Reset Signal Signal Function I/O Bga Ball RESET Phone reset I A2 RESET is used to reset the GE864-QUAD modules. Whenever this signal is pulled low, the GE864-QUAD is reset. When the device is reset it stops any operation. After the release of the reset GE864-QUAD is unconditionally shut down, without doing any detach operation from the network where it is registered. This behavior is not a proper shut down because any GSM device is requested to issue a detach request on turn off. For this reason the Reset signal must not be used to normally shutting down the device, but only as an emergency exit in the rare case the device remains stuck waiting for some network response. The RESET is internally controlled on start-up to achieve always a proper power-on reset sequence, so there is no need to control this pin on start-up. It may only be used to reset a device already on that is not responding to any command. NOTE: Do not use this signal to power off the GE864-QUAD. Use the ON/OFF signal to perform this function or the AT#SHDN command. Reset Signal Operating Levels: Signal Min Max RESET Input high 2.0V* 2.2V RESET Input low 0V 0.2V This signal is internally pulled up so the pin can be left floating if not used. If unused, this signal may be left unconnected. If used, then it must always be connected with an open collector transistor, to permit to the internal circuitry the power on reset and under voltage lockout functions.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 40 of 77 9. Serial Ports The serial port on the Telit GE864-QUAD is the core of the interface between the module and OEM hardware. 2 serial ports are available on the module: MODEM SERIAL PORT MODEM SERIAL PORT 2 (DEBUG) 9.1. Modem Serial Port Several configurations can be designed for the serial port on the OEM hardware, but the most common are: RS232 PC com port Micro controller UART @ 2.8V – 3V (Universal Asynchronous Receive Transmit) Micro controller UART@ 5V or other voltages different from 2.8V Depending from the type of serial port on the OEM hardware a level translator circuit may be needed to make the system work. The only configuration that does not need a level translation is the 2.8V UART. The serial port on the GE864-QUAD is a +2.8V UART with all the 7 RS232 signals. It differs from the PC-RS232 in the signal polarity (RS232 is reversed) and levels. The levels for the GE864-QUAD UART are the CMOS levels: Absolute Maximum Ratings – Not Functional Parameter Min Max Input level on any digital pad when on -0.3V +3.6V Input voltage on analog pads when on -0.3V +3.0 V
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 41 of 77 Operating Range – Interface Levels (2.8V CMOS) Level Min Max Input high level VIH 2.1V 3.3V Input low level VIL 0V 0.5V Output high level VOH 2.2V 3.0V Output low level VOL 0V 0.35V The table below shows the signals of the GE864 serial port: RS232 Pin Number Signal GE864-QUAD Pad Number Name Usage 1 DCD dcd_uart D9 Data Carrier Detect Output from the GE864-QUAD that indicates the carrier presence 2 RXD tx_uart H8 Transmit line * see Note Output transmit line of GE864-QUAD UART 3 TXD rx_uart E7 Receive line *see Note Input receive of the GE864-QUAD UART 4 DTR dtr_uart B7 Data Terminal Ready Input to the GE864-QUAD that controls the DTE READY condition 5 GND A1,F1,H1,L1, H2, Ground ground 6 DSR dsr_uart E11 Data Set Ready Output from the GE864-QUAD that indicates the module is ready 7 RTS rts_uart F7 Request to Send Input to the GE864-QUAD that controls the Hardware flow control 8 CTS cts_uart F6 Clear to Send Output from the GE864-QUAD that controls the Hardware flow control 9 RI ri_uart B6 Ring Indicator Output from the GE864-QUAD that indicates the incoming call condition *NOTE: According to V.24, RX/TX signal names are referred to the application side, therefore on the GE864 side these signal are on the opposite direction: TXD on the application side will be connected to the receive line (here named TXD/ rx_uart ) of the GE864 serial port and vice versa for RX. TIP: For a minimum implementation, only the TXD and RXD lines can be connected, the other lines can be left open provided a software flow control is implemented. TIP: In order to avoid noise or interferences on the RXD lines it is suggested to add a pull up resistor (100K Ω to 2.8V)
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 42 of 77 9.2. RS232 Level Translation In order to interface the Telit GE864 with a PC com port or a RS232 (EIA/TIA-232) application a level translator is required. This level translator must invert the electrical signal in both directions change the level from 0/3V to +15/-15V Actually, the RS232 UART 16450, 16550, 16650 & 16750 chipsets accept signals with lower levels on the RS232 side (EIA/TIA-562) , allowing for a lower voltage-multiplying ratio on the level translator. Note that the negative signal voltage must be less than 0V and hence some sort of level translation is always required. The simplest way to translate the levels and invert the signal is by using a single chip level translator. There are a multitude of them, differing in the number of driver and receiver and in the levels (be sure to get a true RS232 level translator not a RS485 or other standards). By convention the driver is the level translator from the 0-3V UART level to the RS232 level, while the receiver is the translator from RS232 level to 0-3V UART. In order to translate the whole set of control lines of the UART you will need: 5 driver 3 receiver NOTE: The digital input lines working at 2.8VCMOS have an absolute maximum input voltage of 3,75V; therefore the level translator IC shall not be powered by the +3.8V supply of the module. Instead it shall be powered from a +2.8V / +3.0V (dedicated) power supply. This is because in this way the level translator IC outputs on the module side (i.e. GE864 inputs) will work at +3.8V interface levels, stressing the module inputs at its maximum input voltage. This can be acceptable for evaluation purposes, but not on production devices. NOTE: In order to be able to do in circuit reprogramming of the GE864 firmware, the serial port on the Telit GE864 shall be available for translation into RS232 and either it is controlling device shall be placed into tristate, disconnected or as a gateway for the serial data when module reprogramming occurs. Only RXD, TXD, GND and the On/off module turn on pad are required to the reprogramming of the module, the other lines are unused. All applicator shall include in their design such a way of reprogramming the GE864.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 43 of 77 An example of level translation circuitry of this kind is: The RS232 serial port lines are usually connected to a DB9 connector with the following layout:
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 44 of 77 9.3. 5V UART Level Translation If the OEM application uses a microcontroller with a serial port (UART) that works at a voltage different from 2.8 – 3V, then a circuitry has to be provided to adapt the different levels of the two sets of signals. As for the RS232 translation there are a multitude of single chip translators. For example a possible translator circuit for a 5V TRANSMITTER/RECEIVER can be: TIP: This logic IC for the level translator and 2.8V pull-ups (not the 5V one) can be powered directly from VAUX line of the GE864-QUAD. Note that the TC7SZ07AE has open drain output; therefore the resistor R2 is mandatory. TIP: The UART input line TXD (rx_uart) of the GE864-QUAD is NOT internally pulled up with a resistor, so there may be the need to place an external 47KΩ pull-up resistor, either the DTR (dtr_uart) and RTS (rts_uart) input lines are not pulled up internally, so an external pull-up resistor of 47KΩ may be required.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 45 of 77 A power source of the internal interface voltage corresponding to the 2.8VCMOS high level is available at the VAUX pin on the connector, A maximum of 9 resistors of 47 KΩ pull-up can be connected to the PWRMON pin, provided no other devices are connected to it and the pulled-up lines are GE864-QUAD input lines connected to open collector outputs in order to avoid latch-up problems on the GE864-QUAD. Care must be taken to avoid latch-up on the GE864-QUAD and the use of this output line to power electronic devices shall be avoided, especially for devices that generate spikes and noise such as switching level translators, micro controllers, failure in any of these condition can severely compromise the GE864-QUAD functionality. NOTE: The input lines working at 2.8VCMOS can be pulled-up with 47KΩ resistors that can be connected directly to the VAUX line provided they are connected as in this example. In case of reprogramming of the module has to be considered the use of the RESET line to start correctly the activity. The preferable configuration is having an external supply for the buffer.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 46 of 77 10. Audio Section Overview The Baseband chip was developed for the cellular phones, which needed two separated amplifiers both in RX and in TX section. A couple of amplifiers had to be used with internal audio transducers while the other couple of amplifiers had to be used with external audio transducers. To distinguish the schematic signals and the Software identifiers, two different definitions were introduced, with the following meaning: internal audio transducers  HS/MT (from HandSet or MicroTelephone ) external audio transducers  HF (from HandsFree ) Actually the acronyms have not the original importance. In other words this distinction is not necessary, being the performances between the two blocks like the same. Only if the customer needs higher output power to the speaker , he has a constraint. Otherwise the choice could be done in order to overcome the PCB design difficulties. For these reasons we have not changed the HS and HF acronyms, keeping them in the Software and on the schematics. The Base Band Chip of the GE864Telit Module maintains the same architecture. For more information refer to Telit document : “ 80000NT10007a Audio Settings Application Note“. 1.1 Selection mode Only one block can be active at a time , and the activation of the requested audio path is done via hardware by AXE line or via software by AT#CAP command . Moreover the Sidetone functionality could be implemented by the amplifier fitted between the transmit path and the receive path, enabled at request in both modes.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 47 of 77 Audio Section Block Diagram
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 48 of 77 1.2 Electrical Characteristics TIP: Being the microphone circuitry the more noise sensitive, its design and layout must be done with particular care. Both microphone paths are balanced and the OEM circuitry must be balanced designed to reduce the common mode noise typically generated on the ground plane. However the customer can use the unbalanced circuitry for particular application. 10.1.1. Input Lines Characteristics differential microphone paths Line Coupling AC* Line Type Balanced Coupling capacitor ≥ 100nF Differential input resistance 50kΩ Differential input voltage ≤ 1,03Vpp @ MicG=0dB (*) WARNING : AC means that the signals from the microphone have to be connected to input lines of the module through capacitors which value has to be ≥ 100nf. not respecting this constraint, the input stages will be damaged. WARNING: when particular OEM application needs a Single Ended Input configuration, it is forbidden connecting the unused input directly to Ground, but only through a 100nF capacitor. in Single Ended configuration the useful input signal will be halved.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 49 of 77 1.2.1 Output Lines Characteristics TIP: We suggest driving the load differentially from both output drivers, thus the output swing will double and the need for the output coupling capacitor avoided. However if particular OEM application needs also a Single Ended circuitry can be implemented, but the output power will be reduced four times. The OEM circuitry shall be designed to reduce the common mode noise typically generated on the ground plane and to get the maximum power output from the device (low resistance tracks). WARNING: The loads are directly connected to the amplifier outputs when in Differential configuration, through a capacitor when in Single Ended configuration. Using Single Ended configuration, the unused output line must be left open. Not respecting this constraint, the output stage will be damaged. TIP: Remember that there are slightly different electrical performances between the two internal audio amplifiers: the Ear_MTlines can directly drive a 16 Ω load at 12dBFS (**) in Differential configuration Ear_HFlines can directly drive a 16Ω load in Differential or Single Ended configurations There is no difference if the amplifiers drive an external amplifier (**) 0dBFS is the normalized overall Analog Gain for each Output channel equal to 3,7Vpp differential
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 50 of 77 “EAR_MT” Output Lines line coupling AC single-ended DC differential output load resistance ≥ 14 Ω internal output resistance 4 Ω (typical) signal bandwidth 150 - 4000 Hz @ -3 dB max. differential output voltage 1.31 Vrms (typical, open circuit) differential output voltage 328mVrms /16 Ω /@ -12dBFS volume increment 2 dB per step volume steps 10 “EAR_HF” Output Lines line coupling: AC single-ended DC differential output load resistance : ≥ 14 Ω internal output resistance: 4 Ω (>1,7 Ω) signal bandwidth: 150 - 4000 Hz @ -3 dB max. differential output voltage 1.31 Vrms (typical, open circuit) max. S.E. output voltage 656 mVrms (typical, open circuit) volume increment 2 dB per step volume steps 10
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 51 of 77 11. External SIM Holder Implementation Please refer to the related Telit User Guide : “80000NT10001a SIM Holder Design Guides”
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 52 of 77 12. General Purpose I/O The general purpose I/O pads can be configured to act in three different ways: input output alternate function (internally controlled) Input pads can only be read and report the digital value (high or low) present on the pad at the read time; output pads can only be written or queried and set the value of the pad output; an alternate function pad is internally controlled by the GE864-QUAD firmware and acts depending on the function implemented. For Logic levels please refer to chapter 7. The following GPIO are available on the GE864-QUAD: Ball Signal I/O Function Type Input / output current Default State ON_OFF state State during Reset Note C1 TGPIO_01 I/O GPIO01 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 E6 TGPIO_02 I/O GPIO02 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 Alternate function (JDR) C2 TGPIO_03 I/O GPIO03 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 B3 TGPIO_04 I/O GPIO04 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 Alternate function (RF Transmission Control) K8 TGPIO_05 I/O GPIO05 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 Alternate function (RFTXMON) B5 TGPIO_06 I/O GPIO06 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 Alternate function (ALARM) L9 TGPIO_07 I/O GPIO07 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 Alternate function (BUZZER) K11 TGPIO_08 I/O GPIO08 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 C9 TGPIO_09 I/O GPIO09 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 H3 TGPIO_10 I/O GPIO10 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 D1 TGPIO_11 I/O GPIO11 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 G4 TGPIO_12 I/O GPIO12 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 K10 TGPIO_13 I/O GPIO13 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 B4 TGPIO_14 I/O GPIO14 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 F5 TGPIO_15 I/O GPIO15 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 H6 TGPIO_16 I/O GPIO16 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 H5 TGPIO_17 I/O GPIO17 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 K7 TGPIO_18 I/O GPIO18 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 B1 TGPIO_19 I/O GPIO19 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 C3 TGPIO_20 I/O GPIO20 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 0 L10 TGPIO_21 I/O GPIO21 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT 1 E8 TGPIO_22 I/O GPIO22 Configurable GPIO CMOS 1.8V (not 2.8V !!) 1uA / 1mA INPUT 0
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 53 of 77 Not all GPIO pads support all these three modes: GPIO2 supports all three modes and can be input, output, Jamming Detect Output (Alternate function) GPIO4 supports all three modes and can be input, output, RF Transmission Control (Alternate function) GPIO5 supports all three modes and can be input, output, RFTX monitor output (Alternate function) GPIO6 supports all three modes and can be input, output, alarm output (Alternate function) GPIO7 supports all three modes and can be input, output, buzzer output (Alternate function)
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 54 of 77 12.1. GPIO Logic Levels Where not specifically stated, all the interface circuits work at 2.8V CMOS logic levels. The following tables show the logic level specifications used in the GE864-QUAD interface circuits: Absolute Maximum Ratings – Not Functional Parameter Min Max Input level on any digital pin when on -0.3V +3.6V Input voltage on analog pins when on -0.3V +3.0 V Operating Range – Interface Levels (2.8V CMOS) Level Min Max Input high level 2.1V 3.3V Input low level 0V 0.5V Output high level 2.2V 3.0V Output low level 0V 0.35V For 1.8 V signals: Operating Range – Interface Levels (1.8V CMOS) Level Min Max Input high level 1.6V 2.2V Input low level 0V 0.4V Output high level 1,65V 2.2V Output low level 0V 0.35V
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 55 of 77 12.2. Using a GPIO Pad as INPUT The GPIO pads, when used as inputs, can be connected to a digital output of another device and report its status, provided this device has interface levels compatible with the 2.8V CMOS levels of the GPIO. If the digital output of the device to be connected with the GPIO input pad has interface levels different from the 2.8V CMOS, then it can be buffered with an open collector transistor with a 47K pull up to 2.8V. 12.3. Using a GPIO Pad as OUTPUT The GPIO pads, when used as outputs, can drive 2.8V CMOS digital devices or compatible hardware. When set as outputs, the pads have a push-pull output and therefore the pull-up resistor may be omitted. The illustration below shows the base circuit of a push-pull stage: 12.4. Using the RF Transmission Control GPIO4 The GPIO4 pin, when configured as RF Transmission Control Input, permits to disable the Transmitter when the GPIO is set to Low by the application. In the design is necessary to add a pull up resistor (47K to VAUX). 12.5. Using the RFTXMON Output GPIO5 The GPIO5 pin, when configured as RFTXMON Output, is controlled by the GE864-QUAD module and will rise when the transmitter is active and fall after the transmitter activity is completed. For example, if a call is started, the line will be HIGH during all the conversation and it will be again LOW after hanged up. The line rises up 300ms before first TX burst and will became again LOW from 500ms to 1sec after last TX burst. Q1Q2VDDGPIO7
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 56 of 77 12.6. Using the Alarm Output GPIO6 The GPIO6 pad, when configured as Alarm Output, is controlled by the GE864-QUAD module and will rise when the alarm starts and fall after the issue of a dedicated AT command. This output can be used to power up the GE864-QUAD controlling micro controller or application at the alarm time, giving you the possibility to program a timely system wake-up to achieve some periodic actions and completely turn off either the application and the GE864-QUAD during sleep periods, dramatically reducing the sleep consumption to few μA. In battery-powered devices this feature will greatly improve the autonomy of the device. NOTE: During RESET the line is set to HIGH logic level.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 57 of 77 12.7. Using the Buzzer Output GPIO7 As Alternate Function, the GPIO7 is controlled by the firmware that depends on the function implemented internally. This setup places always the GPIO7 pin in OUTPUT direction and the corresponding function must be activated properly by AT#SRP command (refer to AT commands specification). Also in this case, the dummy value for the pin state can be both “0” or “1”. Send the command AT#GPIO=7, 1, 2<cr>: Wait for response OK Send the command AT#SRP=3 The GPIO7 pin will be set as Alternate Function pin with its dummy logic status set to HIGH value. The "Alternate function” permits your application to easily implement Buzzer feature with some small hardware extension of your application as shown in the sample figure below. Example of Buzzer’s driving circuit NOTE: To correctly drive a buzzer, a driver must be provided; its characteristics depend on the Buzzer and for them refer to your buzzer vendor. TR1BCR141WTR2SMBT2907AR14,7KR21KD1D1N4148 C133pF +-+V buzzerGPIO7
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 58 of 77 12.8. Magnetic Buzzer Concepts 12.8.1. Short Description A magnetic Buzzer is a sound-generating device with a coil located in the magnetic circuit consisting of a permanent magnet, an iron core, a high permeable metal disk, and a vibrating diaphragm. Drawing of the Magnetic Buzzer The disk and diaphragm are attracted to the core by the magnetic field. When an oscillating signal is moved through the coil, it produces a fluctuating magnetic field, which vibrates the diaphragm at a frequency of the drive signal. Thus the sound is produced relative to the frequency applied. Diaphragm movement
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 59 of 77 12.8.2. Frequency Behavior The frequency behavior represents the effectiveness of the reproduction of the applied signals. Because its performance is related to a square driving waveform (whose amplitude varies from 0V to Vpp), if you modify the waveform (e.g. from square to sinus) the frequency response will change. 12.8.3. Power Supply Influence Applying a signal whose amplitude is different from that suggested by manufacturer, the performance change following the rule: “if resonance frequency fo increases, amplitude decreases”. Because of resonance frequency depends from acoustic design, lowering the amplitude of the driving signal the response bandwidth tends to become narrow, and vice versa. Summarizing: Vpp ↑  fo ↓ Vpp ↓  fo ↑ The risk is that the fo could easily fall outside of new bandwidth; consequently the SPL could be much lower than the expected. WARNING: It is very important to respect the sense of the applied voltage: never apply to the "-" pin a voltage more positive than the "+" pin: if this happens, the diaphragm vibrates in the opposite direction with a high probability to be expelled from its physical position. This damages the device permanently. 12.8.4. Working Current Influence In the component data sheet you will find the value of MAX CURRENT that represents the maximum average current that can flow at nominal voltage without current limitation. In other words it is not the peak current, which could be twice or three times higher. If driving circuitry does not support these peak values, the SPL will never reach the declared level or the oscillations will stop.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 60 of 77 12.9. Using the Temperature Monitor Function 12.9.1. Short Description The Temperature Monitor is a function of the module that permits to control its internal temperature and if properly set (see the #TEMPMON command on AT Interface guide) it raise to High Logic level a GPIO when the maximum temperature is reached. 12.9.2. Allowed GPIO The AT#TEMPMON set command could be used with one of the following GPIO: Ball Signal Function Type Input / output current Note C1 TGPIO_01 GPIO01 Configurable GPIO CMOS 2.8V 1μA / 1mA C2 TGPIO_03 GPIO03 Configurable GPIO CMOS 2.8V 1μA / 1mA K11 TGPIO_08 GPIO08 Configurable GPIO CMOS 2.8V 1μA / 1mA C9 TGPIO_09 GPIO09 Configurable GPIO CMOS 2.8V 1μA / 1mA H3 TGPIO_10 GPIO10 Configurable GPIO CMOS 2.8V 1μA / 1mA D1 TGPIO_11 GPIO11 Configurable GPIO CMOS 2.8V 1μA / 1mA G4 TGPIO_12 GPIO12 Configurable GPIO CMOS 2.8V 1μA / 1mA K10 TGPIO_13 GPIO13 Configurable GPIO CMOS 2.8V 1μA / 1mA B4 TGPIO_14 GPIO14 Configurable GPIO CMOS 2.8V 1μA / 1mA F5 TGPIO_15 GPIO15 Configurable GPIO CMOS 2.8V 1μA / 1mA H6 TGPIO_16 GPIO16 Configurable GPIO CMOS 2.8V 1μA / 1mA H5 TGPIO_17 GPIO17 Configurable GPIO CMOS 2.8V 1μA / 1mA K7 TGPIO_18 GPIO18 Configurable GPIO CMOS 2.8V 1μA / 1mA B1 TGPIO_19 GPIO19 Configurable GPIO CMOS 2.8V 1μA / 1mA C3 TGPIO_20 GPIO20 Configurable GPIO CMOS 2.8V 1μA / 1mA E8 TGPIO_22 GPIO22 Configurable GPIO CMOS 1.8V (not 2.8V !!) 1μA / 1mA The set command could be used also with one of the following GPIO but in that case the alternate function is not usable: Ball Signal Function Type Input / output current Note E6 TGPIO_02 GPIO02 Configurable GPIO CMOS 2.8V 1μA / 1mA Alternate function (JDR) B3 TGPIO_04 GPIO04 Configurable GPIO CMOS 2.8V 1μA / 1mA Alternate function (RF Transmission Control) K8 TGPIO_05 GPIO05 Configurable GPIO CMOS 2.8V 1μA / 1mA Alternate function (RFTXMON) L9 TGPIO_07 GPIO07 Configurable GPIO CMOS 2.8V 1μA / 1mA Alternate function (BUZZER)
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 61 of 77 12.10. Indication of Network Service Availability The STAT_LED pin status shows information on the network service availability and Call status. In the GE864 modules, the STAT_LED usually needs an external transistor to drive an external LED. Therefore, the status indicated in the following table is reversed with respect to the pin status. LED status Device Status Permanently off Device off Fast blinking (Period 1s, Ton 0,5s) Net search / Not registered / turning off Slow blinking (Period 3s, Ton 0,3s) Registered full service Permanently on a call is active A schematic example could be:
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 62 of 77 12.11. RTC Bypass Out The VRTC pin brings out the Real Time Clock supply, which is separate from the rest of the digital part, allowing having only RTC going on when all the other parts of the device are off. To this power output a backup capacitor can be added in order to increase the RTC autonomy during power off of the battery. NO Devices must be powered from this pin. 12.12. VAUX1 Power Output A regulated power supply output is provided in order to supply small devices from the module. This output is active when the module is ON and goes OFF when the module is shut down. The operating range characteristics of the supply are: Operating Range – VAUX1 power supply Min Typical Max Output voltage 2.75V 2.85V 2.95V Output current 100mA Output bypass capacitor (inside the module) 2.2μF
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 63 of 77 13. DAC and ADC Section 13.1. DAC Converter 13.1.1. Description The GE864-QUAD module provides a Digital to Analog Converter. The signal (named DAC_OUT) is available on BGA Ball C7 of the GE864-QUAD module and on pin 17 of PL102 on EVK2 Board (CS1152). The on board DAC is a 10-bit converter, able to generate a analogue value based a specific input in the range from 0 up to 1023. However, an external low-pass filter is necessary Min Max Units Voltage range (filtered) 0 2,6 Volt Range 0 1023 Steps The precision is 10 bits so, if we consider that the maximum voltage is 2V, the integrated voltage could be calculated with the following formula: Integrated output voltage = 2 * value / 1023 DAC_OUT line must be integrated (for example with a low band pass filter) in order to obtain an analog voltage. 13.1.2. Enabling DAC The AT command below is available to use the DAC function: AT#DAC[=<enable>[,<value>]] <value> – scale factor of the integrated output voltage (0..1023 – 10 bit precision) it must be present if <enable>=1 Refer to SW User Guide or AT Commands Reference Guide for the full description of this function. NOTE: The DAC frequency is selected internally. D/A converter must not be used during POWERSAVING.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 64 of 77 13.1.3. Low Pass Filter Example 13.2. ADC Converter 13.2.1. Description The on board A/D are 11-bit converter. They are able to read a voltage level in the range of 0÷2 volts applied on the ADC pin input, store and convert it into 11 bit word. Min Max Units Input Voltage range 0 2 Volt AD conversion - 11 bits Resolution - < 1 mV The GE864-QUAD module provides 3 Analog to Digital Converters. The input lines are: ADC_IN1 available on Ball J11 and Pin 19 of PL102 on EVK2 Board (CS1152). ADC_IN2 available on Ball H11 and Pin 20 of PL102 on EVK2 Board (CS1152). ADC_IN3 available on Ball G11 and Pin 21 of PL102 on EVK2 Board (CS1152). 13.2.2. Using ADC Converter The AT command below is available to use the ADC function: AT#ADC=1,2 The read value is expressed in mV Refer to SW User Guide or AT Commands Reference Guide for the full description of this function.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 65 of 77 14. Mounting the GE864 on the Board 14.1. General The Telit GE864 modules have been designed in order to be compliant with a standard lead-free SMT process. 14.1.1. Module Finishing & Dimensions Lead-free Alloy: Surface finishing Sn/Ag/Cu for all solder pads Pin A1
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 66 of 77 14.1.2. Recommended Foot Print for the Application (GE864) Top view
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 67 of 77 14.1.3. Suggested Inhibit Area In order to easily rework the GE864 is suggested to consider on the application a 1.5mm Inhibit area around the module: Top view It is also suggested, as common rule for an SMT component, to avoid having a mechanical part of the application in direct contact with the module. 1.5mm 1.5mm
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 68 of 77 14.1.4. Debug of the GE864 in Production To test and debug the mounting of the GE864, we strongly recommend to foreseen test pads on the host PCB, in order to check the connection between the GE864 itself and the application and to test the performance of the module connecting it with an external computer. Depending by the customer application, these pads include, but are not limited to the following signals: TXD RXD ON/OFF RESET GND VBATT TX_TRACE RX_TRACE PWRMON 14.1.5. Stencil Stencil’s apertures layout can be the same of the recommended footprint (1:1), we suggest a thickness of stencil foil ≥ 120µm. 14.1.6. PCB Pad Design Non solder mask defined” (NSMD) type is recommended for the solder pads on the PCB.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 69 of 77 Recommendations for PCB pad dimensions: Ball pitch [mm] 2,5 Solder resist opening diameter A [mm] 1,150 Metal pad diameter B [mm] 1 ± 0.05 It is recommended no microvia without solder resist cover under the module and no microvia around the pads (see following figure). Holes in pad are allowed only for blind holes and not for through holes. Recommendations for PCB pad surfaces: Finish Layer thickness [µm] Properties Electro-less Ni / Immersion Au 3 7 / 0.05 0.15 good solder ability protection, high shear force values The PCB must be able to resist the higher temperatures which are occurring at the lead-free process. This issue must be discussed with the PCB-supplier. Generally, the wettability of tin-lead solder paste on the described surface plating is better compared to lead-free solder paste. 14.1.7. Solder Paste Lead free Solder paste Sn/Ag/Cu
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 70 of 77 14.1.8. GE864 Solder Reflow The illustration below shows the recommended solder reflow profile: Profile Feature Pb-Free Assembly Average ramp-up rate (TL to TP) 3°C/second max Preheat 8 Temperature Min (Tsmin) 8 Temperature Max (Tsmax) Time (min to max) (ts) 150°C 200°C 60-180 seconds Tsmax to TL Ramp-up Rate 3°C/second max Time maintained above: 8 Temperature (TL) Time (tL) 217°C 60-150 seconds Peak Temperature (Tp) 245 +0/-5°C Time within 5°C of actual Peak Temperature (tp) 10-30 seconds Ramp-down Rate 6°C/second max. Time 25°C to Peak Temperature 8 minutes max.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 71 of 77 14.2. Packing System The Telit GE864 modules are packaged on trays of 20 pieces each. This is especially suitable for the GE864 according to SMT processes for pick & place movement requirements. TRAY DRAWING The size of the tray is: 329 x 176mm NOTE: All temperatures refer to topside of the package, measured on the package body surface. NOTE: GE864 module can accept only one reflow process. Section A-A
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 72 of 77 WARNING: These trays can withstand the maximum temperature of 65° C. GE864 Orientation on the Tray
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 73 of 77 Reel Drawing 14.2.1. Moisture Sensibility The level of moisture sensibility of GE864 module is “3”, in according with standard IPC/JEDEC J-STD-020, take care all the relatives requirements for using this kind of components.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 74 of 77 15. Conformity Assessment Issues The Telit GE864 has been assessed in order to satisfy the essential requirements of the R&TTE Directive 1999/05/EC (Radio Equipment & Telecommunications Terminal Equipments) to demonstrate the conformity against the harmonized standards with the final involvement of a Notified Body. If the module is installed in conformance to the Telit installation manuals, no further evaluation under Article 3.2 of the R&TTE Directive and do not require further involvement of a R&TTE Directive Notified Body for the final product. In all other cases, or if the manufacturer of the final product is in doubt, then the equipment integrating the radio module must be assessed against Article 3.2 of the R&TTE Directive. In all cases the assessment of the final product must be made against the Essential requirements of the R&TTE Directive Articles 3.1(a) and (b), Safety and EMC respectively, and any relevant Article 3.3 requirements. This Product Description, the Hardware User Guide and Software User Guide contain all the information you may need for developing a product meeting the R&TTE Directive. Furthermore the GE864 module is FCC Approved as module to be installed in other devices. This device is to be used only for fixed and mobile applications. If the final product after integration is intended for portable use, a new application and FCC is required. The GE864 is conforming to the following US Directives: • Use of RF Spectrum. Standards: FCC 47 Part 24 (GSM 1900) • EMC (Electromagnetic Compatibility). Standards: FCC47 Part 15 This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. To meet the FCC's RF exposure rules and regulations: • The system antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all the persons and must not be co-located or operating in conjunction with any other antenna or transmitter. • The system antenna(s) used for this module must not exceed 1.4dBi (850MHz) and 3.0dBi (1900MHz) for mobile and fixed or mobile operating configurations. • Users and installers must be provided with antenna installation instructions and transmitter operating conditions for satisfying RF exposure compliance. 0889
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 75 of 77 Manufacturers of mobile, fixed or portable devices incorporating this module are advised to clarify any regulatory questions and to have their complete product tested and approved for FCC compliance.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 76 of 77 16. SAFETY RECOMMENDATIONS NOTE: Read this section carefully to ensure the safe operation. Be sure the use of this product is allowed in the country and in the environment required. The use of this product may be dangerous and has to be avoided in the following areas: Where it can interfere with other electronic devices in environments such as hospitals, airports, aircrafts, etc Where there is risk of explosion such as gasoline stations, oil refineries, etc It is responsibility of the user to enforce the country regulation and the specific environment regulation. Do not disassemble the product; any mark of tampering will compromise the warranty validity. We recommend following the instructions of the hardware user guides for a correct wiring of the product. The product has to be supplied with a stabilized voltage source and the wiring has to be conforming to the security and fire prevention regulations. The product has to be handled with care, avoiding any contact with the pins because electrostatic discharges may damage the product itself. Same cautions have to be taken for the SIM, checking carefully the instruction for its use. Do not insert or remove the SIM when the product is in power saving mode. The system integrator is responsible of the functioning of the final product; therefore, care has to be taken to the external components of the module, as well as of any project or installation issue, because the risk of disturbing the GSM network or external devices or having impact on the security. Should there be any doubt, please refer to the technical documentation and the regulations in force. Every module has to be equipped with a proper antenna with specific characteristics. The antenna has to be installed with care in order to avoid any interference with other electronic devices and has to guarantee a minimum distance from the body (20 cm). In case of this requirement cannot be satisfied, the system integrator has to assess the final product against the SAR regulation EN 50360.
GE864-QUAD Hardware User Guide 1vv0300872 Rev.1 2010-04-02 - All Rights Reserved. Page 77 of 77 The European Community provides some Directives for the electronic equipments introduced on the market. All the relevant information are available on the European Community website: http://europa.eu.int/comm/enterprise/rtte/dir99-5.htm The text of the Directive 99/05 regarding telecommunication equipments is available, while the applicable Directives (Low Voltage and EMC) are available at: http://europa.eu.int/comm/enterprise/electr_equipment/index_en.htm

Navigation menu