Silicon Laboratories Finland WF111 IEEE 802.11 b/g/n Wi-Fi module WF111 User Manual Product Data Sheet

Silicon Laboratories Finland Oy IEEE 802.11 b/g/n Wi-Fi module WF111 Product Data Sheet

Contents

User Manual

WF111 – 802.11 B/G/N MODULE DATA SHEET Tuesday, 29 September 2015 Version 1.2.7
Bluegiga Technologies Oy Copyright © 2000-2015 Bluegiga Technologies All rights reserved. Bluegiga Technologies assumes no responsibility for any errors which may appear in this manual. Furthermore, Bluegiga Technologies reserves the right to alter the hardware, software, and/or specifications detailed here at any time without notice and does not make any commitment to update the information contained here. Bluegiga’s products are not authorized for use as critical components in life support devices or systems. The WRAP, Bluegiga Access Server, Access Point and iWRAP are registered trademarks of Bluegiga Technologies. The Bluetooth trademark is owned by the Bluetooth SIG Inc., USA and is licensed to Bluegiga Technologies. All other trademarks listed herein are owned by their respective owners.
Bluegiga Technologies Oy VERSION HISTORY Version Comment 1.0 First public version 1.1 Product codes updated 1.1.1 Added sleep clock specifications 1.1.2 Added frequency variation table 1.1.3 FCC and IC information added 1.1.4 WT111-N layout guide 1.1.5 Some new consumption measurements 1.1.6 Added CE information, corrected supported channels for default FCC version 1.1.7 Different coexistence pad bindings, replaced MIB keys with MIB file names 1.1.8 Listed supported coexistence schemes 1.1.9 Added tape & reel info 1.2.0 Removed unnecessary register information, changes to coexistence description, removed references to engineering sample versions 1.2.1 Repaired broken ToC 1.2.2 MIC Japan and KCC certification info 1.2.3 Improved footprint drawing 1.2.4 EN 300 328 V1.7.1 -> V1.8.1 1.2.5 Added notes on host bus layout 1.2.6 Part numbers updated 1.2.7 Contact and antenna information updated
Bluegiga Technologies Oy TABLE OF CONTENTS 1 Product description ........................................................................................................................................6 2 Ordering Information......................................................................................................................................7 3 Pinout and terminal descriptions ...................................................................................................................8 4 Interfaces .................................................................................................................................................... 12 4.1 Host interfaces ................................................................................................................................... 12 4.1.1 Host selection ................................................................................................................................ 12 4.1.2 SDIO interface ............................................................................................................................... 12 4.1.3 CSR Serial Peripheral Interface (CSPI) ......................................................................................... 13 4.1.4 SDIO/CSPI deep-sleep control schemes ...................................................................................... 14 4.2 Other interfaces ................................................................................................................................. 16 4.2.1 Debug SPI interface ....................................................................................................................... 16 4.2.2 Bluetooth coexistence .................................................................................................................... 16 4.2.3 Configurable I/O pads .................................................................................................................... 17 5 Power Control and Regulation ................................................................................................................... 18 5.1 Power Control and Regulation ........................................................................................................... 18 5.2 REGEN .............................................................................................................................................. 19 5.3 RESET ............................................................................................................................................... 19 6 Example Application Schematic ................................................................................................................. 20 7 Wi-Fi radio .................................................................................................................................................. 22 7.1 Wi-Fi receiver ..................................................................................................................................... 22 7.2 Wi-Fi transmitter ................................................................................................................................ 22 7.3 Antenna switch for Bluetooth coexistence ......................................................................................... 22 8 Electrical characteristics ............................................................................................................................. 23 8.1 Absolute maximum ratings ................................................................................................................ 23 8.2 Recommended Operating Conditions ............................................................................................... 23 8.3 Input/Output terminal characteristics ................................................................................................. 24 9 RF Characteristics ...................................................................................................................................... 25 10 Power Consumption .............................................................................................................................. 27 11 Physical Dimensions .............................................................................................................................. 28 12 Layout Guidelines .................................................................................................................................. 29 12.1 WF111-A ............................................................................................................................................ 29 12.2 WF111-E ............................................................................................................................................ 29 12.3 WF111-N............................................................................................................................................ 29 12.4 Thermal considerations ..................................................................................................................... 31 12.5 EMC considerations ........................................................................................................................... 31 13 Soldering Recommendations................................................................................................................. 33 14 Product packaging ................................................................................................................................. 34
Bluegiga Technologies Oy 15 Certifications .......................................................................................................................................... 35 15.1 CE ...................................................................................................................................................... 35 15.2 FCC and IC ........................................................................................................................................ 35 15.2.1 FCC et IC ................................................................................................................................... 37 15.3 MIC Japan.......................................................................................................................................... 40 15.4 KCC (South-Korea) ............................................................................................................................ 40 15.5 Qualified Antenna Types for WF111-E .............................................................................................. 40 Contact Information ........................................................................................................................................... 41
Bluegiga Technologies Oy 1 Product description DESCRIPTION WF111 is a fully integrated single 2.4GHz band 802.11 b/g/n module, intended for portable and battery powered applications, where Wi-Fi connectivity is needed. WF111 integrates an IEEE 802.11 b/g/n radio, antenna or U.FL antenna connector and SDIO or CSPI host interfaces. WF111 provides a low cost and simple Wi-Fi solution for devices that run an operating system and a TCP/IP stack on-board, but still offers the benefits of a module – small form factor, easy integration and certifications. Bluegiga also provides WF111 drivers for the Linux operating system. TARGET APPLICATIONS:  PoS terminals  RFID and laser scanners  Wi-Fi internet radios and audio streaming products  Wireless cameras  Portable navigation devices  Portable handheld devices  Wi-Fi medical sensors  Wireless picture frames KEY FEATURES:  IEEE 802.11 b/g/n radio o Single stream 2.4 GHz band o Bit rates up to 72.2Mbps  Integrated antenna or U.FL connector  Hardware support for WEP, WPA and WPA2 encryption  Soft-AP support  Temperature range: -40oC to +85oC  SDIO or CSPI host interfaces  Fully CE, FCC, IC, Japan and South-Korea certified  Operating system drivers for Linux PHYSICAL OUTLOOK: Figure 1: WF111-A
Bluegiga Technologies Oy Page 7 of 41 2 Ordering Information WF1 1 1- X Antenna:A = Internal antennaE = ExternalN = RF pinWF111 Product Numbering Confirmed products and codes Product code Description WF111-A-v1 WF111 module with internal chip antenna WF111-E-v1 WF111 module with U.FL connector for external antenna WF111-N-v1 WF111 module with 50 RF pin (contact sales@bluegiga.com for availability) DKWF111 WF111-A SDIO evaluation kit
Bluegiga Technologies Oy Page 8 of 41 3 Pinout and terminal descriptions Figure 2: WF111 pinout
Bluegiga Technologies Oy Page 9 of 41 POWER SUPPLIES PIN NUMBER DESCRIPTION VDD_REGIN 17 Input for the internal regulators REGEN 23 Pull high to enable internal voltage regulators (2.0V max) GND 1, 8, 14, 21, 29, 30, 32 Ground GND_PAD 33 Thermal pad, on bottom of WF111 VDD_ANA 10 Positive supply for PA control VDD_PADS 19 Positive supply for the digital interfaces VDD_SDIO 15 Positive supply for the SDIO interface VDD_PA 28 Positive supply for the power amplifier Table 1: Supply Terminal Descriptions PIO PORT PIN NUMBER PAD TYPE DESCRIPTION PIO[0] 22 Bi-directional, programmable strength internal pull-down/pull-up Programmable input/output line. Can be used for Bluetooth co-existence. PIO[1] 24 PIO[2] 16 PIO[3] 20 PIO[4] 18 PIO[5] 27 Table 2: GPIO Terminal Descriptions
Bluegiga Technologies Oy Page 10 of 41 SDIO/CSPI Interfaces PIN NUMBER PAD TYPE DESCRIPTION SDIO_DATA[0] 2 Bi-directional, tri-state, weak internal pull-up Synchronous data input/output SDIO_SPI_DI SDIO SPI data output CSPI_MISO CSPI data output SDIO_DATA[1] 3 Synchronous data input/output SDIO_SPI_INT SDIO SPI interrupt output CSPI_INT CSPI data input SDIO_DATA[2] 4 Synchronous data input/output SDIO_DATA[3] 5 Bi-directional, weak/strong internal pull-up Synchronous data input/output SDIO_SPI_CS# SDIO SPI chip select, active low CSPI_CS# CSPI chip select, active low SDIO_CLK 6 Input, weak internal pull-up SDIO clock SDIO_SPI_SCLK SDIO SPI clock CSPI_CLK CSPI clock SDIO_CMD 7 Bi-directional, weak internal pull-up SDIO data input SDIO_SPI_MOSI SDIO SPI data input CSPI_MOSI CSPI data input Table 3: Host Interface Terminal Descriptions
Bluegiga Technologies Oy Page 11 of 41 OTHER SIGNALS PIN NUMBER PAD TYPE DESCRIPTION RST 25 Input, weak internal pull-up, active low System reset ANT 31 RF, DC blocked Antenna output on N variant, on A and E variants not connected BT 9 RF, DC blocked Bluetooth antenna sharing RF input Table 4: Other Terminal Descriptions DEBUG SPI INTERFACE PIN NUMBER PAD TYPE DESCRIPTION SPI_MISO 11 Output, tri-state, weak internal pull-down Synchronous data output SPI_CLK 12 Input, weak internal pull-down Synchronous clock input SPI_MOSI 13 Synchronous data input SPI_CS 26 Debug SPI Chip select, active low Table 5: Debug SPI Terminal Descriptions
Bluegiga Technologies Oy Page 12 of 41 4 Interfaces 4.1 Host interfaces WF111 can be interfaced by the host using SDIO in 1bit or 4bit mode, SDIO SPI or CSR proprietary CSPI connection. The host connection buses can be clocked up to 50MHz. Due to the relatively high clock rate, the bus layout should be done carefully. To prevent radiated emissions and bus errors due to reflections, the host bus should be kept short, the signals should run over an uninterrupted ground plane and the clock line should be series terminated with a 22 to 33 ohm resistor as close to the clock output pin of the host processor as possible. 4.1.1 Host selection WF111 will default to 1-bit SDIO mode. The host interface can be set with 1-bit SDIO or SDIO SPI commands to the required mode. After mode selection, it will then remain in that mode until the module is reset either with the RESET pin or the internal power supply supervisor. 4.1.2 SDIO interface This is a host interface which allows a Secure Digital Input Output (SDIO) host to gain access to the internals of the chip. All defined slave modes (SPI, SD 1bit, SD 4bit) are provided. Two functions are supported:  Function 0 is mandatory function used for SDIO slave configuration. This contains CCCR, FBR and CIS. CCCR registers support sleep and wakeup signaling.  Function 1 provides access to the IEEE 802.11 functionality. Command IO_RW_DIRECT (CMD52) is used to directly access internal registers. IO_RW_EXTENDED (CMD53) is used for block transfer to/from module MMU buffers. Command SD Mode (1/4 bit) SDIO SPI Mode GO_IDLE_STATE (CMD0) Y Y SEND_RELATIVE_ADDR (CMD3) Y N IO_SEND_OP_COND (CMD5) Y Y SELECT/DESELECT_CARD (CMD7) Y N GO_INACTIVE_STATE (CMD15) Y N IO_RW_DIRECT (CMD52) Y Y IO_RW_EXTENDED (CMD53) Y Y CRC_ON_OFF (CMD59) N Y Table 6: Supported commands per mode For more information and detailed descriptions of above functions and commands, see the following specifications:  SD Specifications Part 1 Physical Layer Specification v.1.10
Bluegiga Technologies Oy Page 13 of 41  SD Specification Part E1 SDIO Specification v.1.10 4.1.3 CSR Serial Peripheral Interface (CSPI) The CSPI is a host interface which shares pins with the SDIO. It contains a number of modifications on the SDIO SPI specification aimed at increasing the host bus efficiency in hosts supporting SPI but not SDIO. The main advantages compared to SDIO SPI are:  Burst transfer is continuous instead of blocks with CRC  Timings are deterministic (fixed number of clocks) reducing the required interaction  16 bit registers are transferred as a single command instead of two 8 bit writes MMU buffers are accessed using burst read/writes. The command and address fields are used to select the correct buffer. The CSPI is able to generate an interrupt to the host when a memory access fails. This interrupt line is shared with the SDIO functions. The CSPI Interface is an extension of the basic SPI Interface, with the access type determined by the following fields:  8-bit command  24-bit address  16-bit burst length (optional). Only applicable for burst transfers into or out of the MMU 4.1.3.1 CSPI read/write cycles Register read/write cycles are used to access Function 0, Bluetooth acceleration and MCU registers. Burst read/write cycles are used to access the MMU. 4.1.3.2 CSPI register write cycle The command and address are locked into the slave, followed by 16bits of write data. An Error Byte is returned on the MISO signal indicating whether or not the transfer has been successful. Figure 3: CSPI Register Write Cycle 4.1.3.3 CSPI register read cycle The command and address field are clocked into the slave, the slave then returns the following:  Bytes of padding data (MISO held low)  Error byte  16-bits of read data
Bluegiga Technologies Oy Page 14 of 41 Figure 4: CSPI Register Read Cycle 4.1.3.4 CSPI register burst write cycle Burst transfers are used to access the MMU buffers. They cannot be used to access registers. Burst read/write cycles are selected by setting the nRegister/Burst bit in the command field to 1. Burst transfers are byte orientated, have a minimum length of 0 bytes and a maximum length of 64kbytes. Setting the length field to 0 results in no data being transferred to or from the MMU. As with a register access, the command and address fields are transferred first. There is an optional length field transferred after the address. The use of the length field is controlled by the LengthFieldPresent bit in the Function 0 registers, which is cleared on reset. Figure 5: CSPI Burst Write Cycle 4.1.3.5 CSPI register read cycle Burst reads have a programmable amount of padding data that is returned by the slave. 0-15 bytes are returned as defined in the BurstPadding register. Following this the Error byte is returned followed by the data. Once the transfer has started, no further padding is needed. A FIFO within SDIO_TOP will pre-fetch the data. The address is not retransmitted, and is auto-updated within the slave. The length field is transmitted if LengthFieldPresent in the Function 0 registers is set. In the absence of a length field the CSB signal is used to indicate the end of the burst. Figure 6: CSPI Burst Read Cycle 4.1.4 SDIO/CSPI deep-sleep control schemes The module automatically enters deep sleep to minimize power consumption after a while of idling. Deep sleep is the lowest power mode, where the processor, the internal reference (fast) clock, and much of the digital and analogue hardware are shut down. The SDIO communication system however remains on, and is clocked by the host system. During deep sleep only the function 0 is available, while attempts to access
Bluegiga Technologies Oy Page 15 of 41 Function 1 will likely result in bus timeouts. Function 0 is also available when the Wi-Fi core is physically powered off, as long as the VDD_SDIO supply is present. Control of when the module is allowed to enter deep sleep is done via Vendor Unique Register in CCCR in function 0. Wake-up is also initiated through this register. The module will initiate an SDIO interrupt when the wake-up is complete.
Bluegiga Technologies Oy Page 16 of 41 4.2 Other interfaces 4.2.1 Debug SPI interface A separate SPI bus is provided at the module pads for device access during testing and uploading settings during application development and manufacturing. This interface cannot be used as a host interface. It is recommended to bring these to a connector or test pads in case RF certification measurements that cannot be made through the host connection are required with the finished design. If it is not expected that certification measurements would be needed, the debug SPI pads should be left unconnected. The pads do not need external pull-ups when unconnected. The debug SPI bus has logic levels set by the VDD_PADS reference supply line. 4.2.2 Bluetooth coexistence Bluetooth coexistence systems allow co-located Wi-Fi and Bluetooth devices to be aware of each other and to avoid simultaneous transfers that would degrade link performance. WF111 supports a number of different coexistence schemes with up to 6 control lines for hardware communication between the two devices. For reliable simultaneous communication both stacks need to be able to communicate together, in practice a common driver system needs to be used so the packet priorities can be communicated between the stacks. With separate stacks the only communication channel is the hardware interface and the devices have only high and low priorities in use. As Wi-Fi data will automatically get higher priority than Bluetooth, high data throughput on Wi-Fi may lead to poor Bluetooth operation when used simultaneously. Wi-Fi and Bluetooth may use separate antennas, or share a single antenna through a switch. With a shared antenna, usually two additional signals are needed to control the front end switch. WF111 contains an internal switch for separating Wi-Fi and Bluetooth transmissions. (See chapter 7.3.) For use with CSR-based Bluetooth (BC4 to BC6 with firmware version 21 or later, BC7 and onwards with all versions), Unity-3e+ is recommended as the coexistence scheme. Unity-3e is an enhanced version of the 3-wire Unity-3 –scheme that uses tighter timings and uses the three control lines also for antenna switch control, removing the need for the two separate switch control lines. Unity-3e+, or Unity-3e with Unity+ adds an additional BT_PERIODIC signal to communicate the need for a periodic transmission from the Bluetooth to the Wi-Fi, allowing a guaranteed low-latency throughput for certain Bluetooth applications despite high Wi-Fi usage. This allows reliable audio connections that would otherwise suffer from the Wi-Fi’s higher priority. Use of Unity+ requires the use of a combined stack driver. Without software support, the periodic signaling cannot be initialized. Figure 7: Coexistence signals between WF111 and WT21 Bluetooth module (not showing antenna sharing connection)
Bluegiga Technologies Oy Page 17 of 41 Using the Unity-3e+ scheme and the pictured PIO pad bindings, the MIB file mib111_drv_coex.dat should be used. If needed, the PIO pads PIO[3], PIO[5], PIO[4] and PIO[2] can also be used for BT_STATUS, BT_ACTIVE, WLAN_DENY and BT_PERIODIC, respectively, in which case the MIB file mib111_drv_coex_alt.dat should be chosen. On the DKWF111 evaluation board, the PIO[5] pad is connected to an activity led, which is supported by the MIB files mib111_drv_led.dat and mib111_drv_coex_led.dat, the latter of which contains signal bindings for the scheme pictured above. The PSKEYs for the Unity-3e+ on the WT21 are: PSKEY_LC_COMBO_DISABLE_PIO_MASK (0x0028) = 0x0200 0x0000 0x0000 PSKEY_LC_COMBO_DOT11_CHANNEL_PIO_BASE (0x002A) = 0x0011 PSKEY_LC_COMBO_DOT11_ESCO_RTX_PRIORITY ( 0x0050) = 0x0001 PSKEY_LC_COMBO_DOT11_PULL_DISABLE_MASK (0x005A) = 0x0200 PSKEY_LC_COMBO_DOT11_PERIODIC_PIO_MASK (0x005C) = 0x0010 0x0000 PSKEY_LC_COMBO_DOT11_T1 (0x005E) = 0x0043 PSKEY_LC_COMBO_DOT11_T2 (0x005F) = 0x000A PSKEY_TXRX_PIO_CONTROL (0x0209) = 0x0001 WF111 has hardware support for 3-wire, 4-wire, Unity-3e and Unity+ coexistence schemes. The default MIB files support only Unity-3e with Unity+. For other coexistence schemes a custom MIB is required, for more information please contact Bluegiga technical support. 4.2.3 Configurable I/O pads A number of programmable bi-directional input/outputs (I/O) are provided. PIO[0:5] logic levels are referred to the VDD_PADS supply line. PIO lines can be configured through software to implement various automated functions or as generic inputs or outputs. As inputs the lines can be configured to have either weak or strong pull-ups or pull-downs. All PIO lines are configured as inputs with weak pull-downs at reset. In addition to the coexistence functions, any of the PIO lines can be configured as interrupt request lines, wake-up lines from sleep modes, status led drivers with multiple internally generated modes, general I/O pins controlled by the host, or as a 32.768 kHz sleep clock input. For further information, please contact Bluegiga technical support. Note: All unused signals can be left floating. The GPIO lines have internal pull-downs.
Bluegiga Technologies Oy Page 18 of 41 5 Power Control and Regulation 5.1 Power Control and Regulation Figure 8: System block diagram WF111 contains four linear regulators supplying clean voltages for the different parts of the system. All of them produce a 1.2V output voltage, and are fed from a common input, VDD_REGIN. This input can be supplied with a voltage between 1.45-2.0V, typically 1.5V or 1.8V. The VDD_REGIN supply should be relatively clean of ripple and switching spikes in order to avoid degrading the RF performance. WF111 also needs four other supply lines connected in addition to VDD_REGIN:  VDD_PADS provides a reference voltage for matching voltage levels of the host system to the GPIO pins used for Bluetooth coexistence and other functions. This can range from 1.7V to 3.6V. The current drawn from this supply is negligible.  VDD_SDIO provides a reference voltage for matching voltage levels of the host system to the SDIO connection. This can range from 1.7V to 3.6V. The current drawn from this supply depends on bus usage, but with no active data transfer will be negligible.  VDD_ANA provides a reference voltage for communication between the Wi-Fi chip and the power amplifier. This should be between 1.7V and 3.6V. The current drawn from this supply is negligible.  VDD_PA is a separate supply voltage for the Wi-Fi power amplifier. This supply will draw considerable currents in pulses. The power traces should be relatively wide. This voltage can range from 2.7V to 4.8V making use directly from a single lithium cell possible. A higher supply voltage will not affect the power amplifiers current draw significantly. The regulator supplying VDD_PA should be capable of reacting to load changes within 5µs. Note: VDD_PA has an internal 2.2µF ceramic bypass capacitor, it should be made certain the regulator feeding VDD_PA is stable with ceramic load capacitors. These voltages are not tied to each other and any combination of supply voltages within the specified limits can be used.
Bluegiga Technologies Oy Page 19 of 41 In a 3.3V logic level host system all other supplies would usually be tied to the 3.3V supply, with a separate regulator providing the 1.45-2.0V supply for the Wi-Fi core. A switch mode regulator with 1.5V output is recommended for minimum power consumption. Please see the example schematic in this datasheet. In a 1.8V logic level host system, all other supplies can be connected to the 1.8V supply rail except VDD_PA which should be connected to a 2.7-4.8V supply. The higher voltage supplies should be powered before or at the same time as the core supply line, i.e. the VDD_REGIN should be powered up last. Powering the core first may lead to the GPIO and SDIO blocks booting into an inaccessible state. External high frequency bypassing for any the supply lines is not required, all supplies contain internal capacitors. If the VDD_PA line is fed directly from a battery or there are concerns about the speed of the regulator feeding it, a capacitor of around 100µF should be connected close to the module. Note: All supply voltages and ground lines must be connected. 5.2 REGEN The regulator enable pin REGEN is used to enable the WF111. REGEN enables the regulators of the digital and analog core supply voltages. The pin is active high, with a logic threshold of around 1V, and has a weak pull-down. REGEN can tolerate voltages up to 2.0V, and may be connected directly to the internal voltage regulator input (VDD_REGIN) to permanently enable the device. Part of the regulators can also be disabled by firmware in power saving modes. The VDD_REGIN supply can also be externally switched off while leaving the other supply voltages powered. Cutting power to the core will fully shut down the module internal processors and returning power will cause a power-on reset, requiring a full initialization of the module. The REGEN pin will not disable system blocks not supplied by the core supply, meaning the coexistence interface and the SDIO Function 0 are available even when the core is powered off. 5.3 RESET WF111 may be reset from several sources: RESET pin, power-on reset, via software configured watchdog timers as well as through the SDIO/CSPI host interface. The RESET pin is an active low reset and is internally filtered using the internal low frequency clock oscillator. A reset is performed between 1.5 and 4.0ms following RESET being active. It is recommended that RESET be applied for a period greater than 5ms. The power-on reset occurs when the core supply (generated by the internal 1.2V linear regulator) falls below typically 1.05V and is released when core voltage rises above typically 1.10V. At reset regardless of the source the digital I/O pins are set to a high impedance state with weak pull-downs, except RESET and DEBUG_SPI_CS# which have a weak pull-up. The host connection interface is only reset by the RESET pin or a power-on reset. A power-on reset can be achieved through powering down the digital core by either externally cutting the VDD_REGIN supply or giving a low pulse to the REGEN-pad. If REGEN is connected to the host system for powering down the module, or a separate core power switch is implemented, the RESET pin can be tied permanently to a supply voltage line. Following a reset, WF111 automatically generates internally the clocks needed for safe boot-up of the internal processors. The crystal oscillator is then configured by software with the correct input frequency. Note: holding the RESET line low will not drive the module into a low power consumption mode, it can’t be used as a power-off signal
Bluegiga Technologies Oy Page 20 of 41 6 Example Application Schematic Figure 9: An example application circuit with SDIO host connection, 3.3V level host logic and 1.5/1.8V core supply, REGEN hard wired to the core supply and RST pad used to reset the module (Note: with N-variant ANT-pad and associated grounds would also be connected)
Bluegiga Technologies Oy Page 21 of 41 Figure 10: An example application circuit with SDIO host connection, 1.8V level host logic and a separate power amplifier supply, RST hard wired to the core supply and REGEN pad used to power off and reset the module (Note: with N-variant ANT-pad and associated grounds would also be connected)
Bluegiga Technologies Oy Page 22 of 41 7 Wi-Fi radio 7.1 Wi-Fi receiver The receiver features direct conversion architecture. Sufficient out-of-band blocking specification at the Low Noise Amplifier (LNA) input allows the receiver to be used in close proximity to Global System for Mobile Communications (GSM) and Wideband Code Division Multiple Access (W-CDMA) cellular phone transmitters without being desensitized. High-order baseband filters ensure good performance against in-band interference. 7.2 Wi-Fi transmitter The transmitter features a direct IQ modulator. Digital baseband transmit circuitry provides the required spectral shaping and on-chip trims are used to reduce IQ modulator distortion. Transmitter gain can be controlled on a per-packet basis, allowing the optimization of the transmit power as a function of modulation scheme. The internal Power Amplifier (PA) has a maximum output power of +15dBm for IEEE 802.11g/n and +16dBm for IEEE 802.11b. The module internally compensates for PA gain and reference oscillator frequency drifts with varying temperature and supply voltage. 7.3 Antenna switch for Bluetooth coexistence WF111 supports sharing the integrated antenna or antenna connector with a Bluetooth device through the BT_RF pad. The module contains a bypass switch to route the Bluetooth signal directly to the antenna, and supports using the internal LNA for Bluetooth reception. The switch is controlled through the coexistence interface. Using the switch will require either two extra control lines or support for Unity-3e scheme for both devices. Antenna sharing will require full re-certification of both modules used for FCC due to the changed antenna path and some radiated emission measurements for CE. Without a combined stack driver, the coexistence system will have reduced performance and antenna sharing will reduce it further during simultaneous communication. The antenna switch will also have some losses which will reduce Bluetooth range. For low rate communication or non-simultaneous use the system should function well. Currently, Bluegiga does not recommend antenna sharing due to the suboptimal performance.
Bluegiga Technologies Oy Page 23 of 41 8 Electrical characteristics 8.1 Absolute maximum ratings Rating Min Max Unit Storage temperature -40 85 °C VDD_PADS, VDD_ANA, VDD_SDIO -0.4 3.6 V VDD_REGIN, REGEN -0.4 2.5 V VDD_PA -0.4 6 V Other terminal voltages VSS+0.3 VDD+0.3 V Table 7: Absolute Maximum Ratings 8.2 Recommended Operating Conditions Rating Min Max Unit Operating temperature range (a) -40 85 °C VDD_PADS, VDD_SDIO, VDD_ANA 1.7 3.6 V VDD_PA 2.7 4.8 V VDD_REGIN 1.45 2 V Table 8: Recommended Operating Conditions (a) The module will heat up depending on use, at high transmit duty cycles the maximum operating temperature may need to be derated. See chapter 12.4
Bluegiga Technologies Oy Page 24 of 41 8.3 Input/Output terminal characteristics Digital Terminals Min Typ Max Unit Input Voltage Levels VIL input logic level low 1.7V ≤ VDD ≤ 3.6V -0.3 - 0.25*Vdd V VIH input logic level low 1.7V ≤ VDD ≤ 3.6V 0.625*Vdd - VDD+0.3 V Output Voltage Levels VOL output logic level low 1.7V ≤ VDD ≤ 3.6V, (Io = 4.0 mA) - - 0.4 V VOH output logic level low 1.7V ≤ VDD ≤ 3.6V, (Io = -4.0 mA) 0.75*Vdd - Vdd V Input Tri-state Current with: Strong pull-up -150 -40 -10 µA Strong pull-down 10 40 150 µA Weak pull-up -5 -1 -0.33 µA Weak pull-down 0.33 1 5 µA I/O pad leakage current -1 0 1 µA Pad input capacitance 1 - 5 pF Table 9: Digital terminal electrical characteristics
Bluegiga Technologies Oy Page 25 of 41 9 RF Characteristics Min max Channel 1 11 (13) Support for modules with 13 channels enabled can be by specific order by contacting Bluegiga Sales. MOQ will apply. With 13 channels enabled, the FCC certification will not apply. Frequency 2412 2462 (2472) MHz Table 10: Supported frequencies Standard Supported bit rates 802.11b 1, 2, 5.5, 11 Mbps 802.11g 6, 9, 12, 18, 24, 36, 48, 54 Mbps 802.11n, HT, 20MHz, 800ns 6.5, 13, 19.5, 26, 39, 52, 58.5, 65 Mbps 802.11n, HT, 20MHz, 400ns 7.2, 14.4, 21.7, 28.9, 43.3, 57.8, 65, 72.2 Mbps Table 11: Supported modulations 802.11b Typ 802.11g Typ 802.11n short GI Typ 802.11n long GI Typ 1 Mbps -97 dBm 6 Mbps -92 dBm 6.5 Mbps -91 dBm 7.2 Mbps -92 dBm 2 Mbps -95 dBm 9 Mbps -91 dBm 13 Mbps -87 dBm 14.4 Mbps -90 dBm 5.5 Mbps -93 dBm 12 Mbps -89 dBm 19.5 Mbps -85 dBm 21.7 Mbps -87 dBm 11 Mbps -89 dBm 18 Mbps -87 dBm 26 Mbps -82 dBm 28.9 Mbps -84 dBm 24 Mbps -84 dBm 39 Mbps -78 dBm 43.3 Mbps -80 dBm 36 Mbps -80 dBm 52 Mbps -74 dBm 57.8 Mbps -75 dBm 48 Mbps -75 dBm 58.5 Mbps -71 dBm 65 Mbps -72 dBm 54 Mbps -73 dBm 65 Mbps -68 dBm 72.2 Mbps -69 dBm Table 12: Receiver sensitivity
Bluegiga Technologies Oy Page 26 of 41 Modulation type Min Typ Max 802.11b +15 +16 +17 dBm 802.11g +14 +15 +16 dBm 802.11n +14 +15 +16 dBm Table 13: Transmitter output power at maximum setting Operating mode Min Typ Max Switch loss (TX and RX) -2.5 -3 -3.5 dB Table 14: BT antenna sharing interface properties Typ Max 802.11 limit (total error) Variation between individual units +/-5 +/-10 +/-25 ppm Variation with temperature +/-3 +/-10 +/-25 ppm Table 15: Carrier frequency accuracy
Bluegiga Technologies Oy Page 27 of 41 10 Power Consumption Operating mode VDD_PA/peak VDD_PA/typ VDD_REGIN/peak VDD_REGIN/typ Transmit (802.11b, 1M, +16dBm) 248 mA 190 mA 240 mA 100 mA Transmit (802.11b, 1M, +8dBm) 144 mA 90 mA Transmit (802.11g, 54M, +15dBm) 154 mA 104 mA Receive, no data 12 mA 10.5 mA 240 mA 114 mA Deep sleep 9 µA 75 µA Table 16: Current consumption during specific operating modes Operating mode Bit rate Throughput (sw. limited) Current/3.3V Transmit/802.11n 65 Mbps 12 Mbps 144 mA Transmit/802.11g 18 Mbps 5.9 Mbps 192 mA Transmit/802.11b 11 Mbps 4.8 Mbps 192 mA Transmit/802.11b 1 Mbps 920 kbps 184 mA Transmit/802.11n 72.2 Mbps 1 Mbps 74 mA* Transmit/802.11g 54 Mbps 1 Mbps 78 mA Transmit/802.11g 18 Mbps 1 Mbps 86 mA Transmit/802.11b 11 Mbps 1 Mbps 94 mA Transmit/802.11b 2 Mbps 1 Mbps 158 mA Receive 72 Mbps 16.5 Mbps 88 mA Receive 72 Mbps 1 Mbps 70 mA* Idle, associated 1.7 mA** Idle, non-associated 110µA Table 17: Average current consumption in normal use with various constant throughputs measured from evaluation board test point (Preliminary) *) Note 1: The module draws about 70mA in idle mode without power saves enabled. **) Note 2: With 100ms beacon interval and full power save enabled. Increasing beacon interval will reduce consumption further.
Bluegiga Technologies Oy Page 28 of 41 11 Physical Dimensions Figure 11: Physical dimensions Figure 12: WF111 recommended PCB land pattern
Bluegiga Technologies Oy Page 29 of 41 12 Layout Guidelines 12.1 WF111-A Figure 13: Recommended layouts, on board corner and on board edge See figure 13: recommended layout for the suggested module layout. The impedance matching of the antenna is designed for a layout similar to the module evaluation board. For an optimal performance of the antenna the layout should strictly follow the layout example shown in figure 8 and the thickness of FR4 should be between 1 and 2 mm, preferably 1.6mm. Any dielectric material close to the antenna will change the resonant frequency and it is recommended not to place a plastic case or any other dielectric closer than 5 mm from the antenna. ANY metal in close proximity of the antenna will prevent the antenna from radiating freely. It is recommended not to place any metal or other conductive objects closer than 20 mm to the antenna except in the directions of the ground planes of the module itself. For optimal performance, place the antenna end of the module outside any metal surfaces and objects in the application, preferably on the device corner. The larger the angle in which no metallic object obstructs the antenna radiation, the better the antenna will work. DO NOT place WF111-A in the middle of the application board. Even with a board cutout around the antenna the range will be bad. The three pads on the antenna end of the WF111-A can be connected to the ground or left unsoldered. 12.2 WF111-E RF output can be taken directly from the U.FL connector of the module, and no antenna clearances need to be made for the module. The three pads on the antenna end of the module can be connected to the ground or left unsoldered. 12.3 WF111-N Antenna connection is routed to pad 31. Pads 30 and 32 beside the antenna connection should be properly connected to the ground plane. No antenna clearances are needed for the module itself. The antenna trace should be properly impedance controlled and kept short. Figure 14 shows a typical 50 ohm trace from the RF pin to a SMA connector.
Bluegiga Technologies Oy Page 30 of 41 Figure 14: Typical 50 trace for WF111-N A transmission line impedance calculator, such as TX-Line made by AWR, can be used to approximate the dimensions for the 50 ohm transmission line. Figure 15 shows an example for two different 50 ohm transmission lines. FR4, εr= 4.6Prepreg, εr= 3.7W = 0.15 mmh = 0.076 mmG = 0.25 mmGND stitching viasRF GROUNDRF GROUND RF GROUNDRF GROUNDFR4, εr= 4.6 h = 1 mmW = 1.8 mmMICROSTRIPCPW Ground Figure 15: Example cross section of two different 50 ohm transmission line
Bluegiga Technologies Oy Page 31 of 41 12.4 Thermal considerations The WF111 module may at continuous full power transmit consume up to 1 W of DC power, most of which is drawn by the power amplifier. Most of this will be dissipated as heat. In any application where high ambient temperatures and constant transmissions for more than a few seconds can occur, it is important that a sufficient cooling surface is provided to dissipate the heat. The thermal pad in the bottom of the module must be connected to the application board ground planes by soldering. The application board should provide a number of vias under and around the pad to conduct the produced heat to the board ground planes, and preferably to a copper surface on the other side of the board in order to dissipate the heat into air. The module internal thermal resistance should in most cases be negligible compared to the thermal resistance from the module into air, and common equations for surface area required for cooling can be used to estimate the temperature rise of the module. Only copper planes on the circuit board surfaces with a solid thermal connection to the module ground pad will dissipate heat. For an application with high transmit duty cycles (low bit rate, high throughput, long bursts or constant streaming) the maximum allowed ambient temperature should be reduced due to inherent heating of the module, especially with small fully plastic enclosed applications where heat transfer to ambient air is low due to low thermal conductivity of plastic. The module measured on the evaluation board exhibits a temperature rise of about 25oC above ambient temperature when continuously transmitting IEEE 802.11b at full power with minimal off-times and no collision detection (a worst case scenario regarding power dissipation). An insufficiently cooled module will rapidly heat beyond operating range in ambient room temperature. 12.5 EMC considerations Following recommendations helps to avoid EMC problems arising in the design. Note that each design is unique and the following list do not consider all basic design rules such as avoiding capacitive coupling between signal lines. Following list is aimed to avoid EMC problems caused by RF part of the module.  Do not remove copper from the PCB more than needed. For proper operation the antenna requires a solid ground plane with as much surface area as possible. Use ground filling as much as possible. Connect all grounds together with multiple vias. Do not leave small floating unconnected copper areas or areas connected by just one via, these will act as additional antennas and raise the risk of unwanted radiations.  Do not place a ground plane underneath the antenna. The grounding areas under the module should be designed as shown in Figure 13: Recommended layout.  When using overlapping ground areas use conductive vias separated max. 3 mm apart at the edge of the ground areas. This prevents RF from penetrating inside the PCB. Use ground vias extensively all over the PCB. All the traces in (and on) the PCB are potential antennas. Especially board edges should have grounds connected together at short intervals (stitching) to avoid resonances.  Avoid current loops. Keep the traces with sensitive, high current or fast signals short, and mind the return current path, having a short signal path is not much use if the associated ground path between the ends of the signal trace is long. Remember, ground is also a signal trace. The ground will conduct the same current as the signal path and at the same frequency, power and sensitivity.  Split a ground plane ONLY if you know exactly what you are doing. Splitting the plane may cause more harm than good if applied incorrectly. The ground plane acts as a part of the antenna system. Insufficient ground planes or large separate sensitive signal ground planes will easily cause the coupled transmitted pulses to be AM-demodulated by semiconductor junctions around the board, degrading system performance.
Bluegiga Technologies Oy Page 32 of 41 Overlapping GND layers without GND stitching vias Overlapping GND layers with GND stitching vias shielding the RF energy Figure 16: Use of stitching vias to avoid emissions from the edges of the PCB
Bluegiga Technologies Oy Page 33 of 41 13 Soldering Recommendations WF111 is compatible with industrial standard reflow profile for Pb-free solders. The reflow profile used is dependent on the thermal mass of the entire populated PCB, heat transfer efficiency of the oven and particular type of solder paste used. Consult the datasheet of particular solder paste for profile configurations. Bluegiga Technologies will give following recommendations for soldering the module to ensure reliable solder joint and operation of the module after soldering. Since the profile used is process and layout dependent, the optimum profile should be studied case by case. Thus following recommendation should be taken as a starting point guide. - Refer to technical documentations of particular solder paste for reflow profile configurations - Avoid using more than one flow. - Reliability of the solder joint and self-alignment of the component are dependent on the solder volume. Minimum of 150m stencil thickness is recommended. - Aperture size of the stencil should be 1:1 with the pad size. - A low residue, “no clean” solder paste should be used due to low mounted height of the component. - If the vias used on the application board have a diameter larger than 0.3mm, it is recommended to mask the via holes at the module side to prevent solder wicking through the via holes. Solders have a habit of filling holes and leaving voids in the thermal pad solder junction, as well as forming solder balls on the other side of the application board which can in some cases be problematic.
Bluegiga Technologies Oy Page 34 of 41 14 Product packaging
Bluegiga Technologies Oy Page 35 of 41 15 Certifications WF111 is compliant to the following specifications: 15.1 CE WF111 is in conformity with the essential requirements and other relevant requirements of the R&TTE Directive (1999/5/EC). The product is conformity with the following standards and/or normative documents.  EMC (immunity only) EN 301 489-17 V.1.3.2 in accordance with EN 301 489-1 V1.8.1  Radiated emissions EN 300 328 V1.8.1 15.2 FCC and IC 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. FCC RF Radiation Exposure Statement: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. End users must follow the specific operating instructions for satisfying RF exposure compliance. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. This transmitter is considered as mobile device and should not be used closer than 20 cm from a human body. To allow portable use in a known host class 2 permissive change is required. Please contact support@bluegiga.com for detailed information. IC Statements: This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication. If detachable antennas are used: This radio transmitter (identify the device by certification number, or model number if Category II) has been approved by Industry Canada to operate with the antenna types listed below with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list,
Bluegiga Technologies Oy Page 36 of 41 having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device. See table 22 for the approved antennas for WF111-E and WF111-N. OEM Responsibilities to comply with FCC and Industry Canada Regulations The WF111 Module has been certified for integration into products only by OEM integrators under the following conditions:  The antenna(s) must be installed such that a minimum separation distance of 20cm is maintained between the radiator (antenna) and all persons at all times.  The transmitter module must not be co-located or operating in conjunction with any other antenna or transmitter. As long as the two conditions above are met, further transmitter testing will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed (for example, digital device emissions, PC peripheral requirements, etc.). IMPORTANT NOTE: In the event that these conditions cannot be met (for certain configurations or co-location with another transmitter), then the FCC and Industry Canada authorizations are no longer considered valid and the FCC ID and IC Certification Number cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate FCC and Industry Canada authorization. End Product Labeling The WF111 Module is labeled with its own FCC ID and IC Certification Number. If the FCC ID and IC Certification Number are not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module. In that case, the final end product must be labeled in a visible area with the following: “Contains Transmitter Module FCC ID: QOQWF111” “Contains Transmitter Module IC: 5123A-BGTWF111” or “Contains FCC ID: QOQWF111 “Contains IC: 5123A-BGTWF111” The OEM of the WF111 Module must only use the approved antenna(s) described in table 22, which have been certified with this module. The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module or change RF related parameters in the user manual of the end product. To comply with FCC and Industry Canada RF radiation exposure limits for general population, the antenna(s) used for this transmitter must be installed such that a minimum separation distance of 20cm is maintained between the radiator (antenna) and all persons at all times and must not be co-located or operating in conjunction with any other antenna or transmitter.
Bluegiga Technologies Oy Page 37 of 41 15.2.1 FCC et IC Cet appareil est conforme à l’alinéa 15 des règles de la FCC. Deux conditions sont à respecter lors de son utilisation : (1) cet appareil ne doit pas créer d’interférence susceptible de causer un quelconque dommage et, (2) cet appareil doit accepter toute interférence, quelle qu’elle soit, y compris les interférences susceptibles d’entraîner un fonctionnement non requis. Déclaration de conformité FCC d’exposition aux radiofréquences (RF): Ce matériel respecte les limites d’exposition aux radiofréquences fixées par la FCC dans un environnement non contrôlé. Les utilisateurs finaux doivent se conformer aux instructions d’utilisation spécifiées afin de satisfaire aux normes d’exposition en matière de radiofréquence. Ce transmetteur ne doit pas être installé ni utilisé en concomitance avec une autre antenne ou un autre transmetteur. Ce transmetteur est assimilé à un appareil mobile et ne doit pas être utilisé à moins de 20 cm du corps humain. Afin de permettre un usage mobile dans le cadre d’un matériel de catégorie 2, il est nécessaire de procéder à quelques adaptations. Pour des informations détaillées, veuillez contacter le support technique Bluegiga : support@bluegiga.com. Déclaration de conformité IC : Ce matériel respecte les standards RSS exempt de licence d’Industrie Canada. Son utilisation est soumise aux deux conditions suivantes : (1) l’appareil ne doit causer aucune interférence, et (2) l’appareil doit accepter toute interférence, quelle qu’elle soit, y compris les interférences susceptibles d’entraîner un fonctionnement non requis de l’appareil. Selon la réglementation d’Industrie Canada, ce radio-transmetteur ne peut utiliser qu’un seul type d’antenne et ne doit pas dépasser la limite de gain autorisée par Industrie Canada pour les transmetteurs. Afin de réduire les interférences potentielles avec d’autres utilisateurs, le type d’antenne et son gain devront être définis de telle façon que la puissance isotrope rayonnante équivalente (EIRP) soit juste suffisante pour permettre une bonne communication. Lors de l’utilisation d’antennes amovibles : Ce radio-transmetteur (identifié par un numéro certifié ou un numéro de modèle dans le cas de la catégorie II) a été approuvé par Industrie Canada pour fonctionner avec les antennes référencées ci-dessous dans la limite de gain acceptable et l’impédance requise pour chaque type d’antenne cité. Les antennes non référencées possédant un gain supérieur au gain maximum autorisé pour le type d’antenne auquel elles
Bluegiga Technologies Oy Page 38 of 41 appartiennent sont strictement interdites d’utilisation avec ce matériel. Veuillez vous référer au tableau 22 concernant les antennes approuvées pour les WF111. Les responsabilités de l’intégrateur afin de satisfaire aux réglementations de la FCC et d’Industrie Canada : Les modules WF111 ont été certifiés pour entrer dans la fabrication de produits exclusivement réalisés par des intégrateurs dans les conditions suivantes :  L’antenne (ou les antennes) doit être installée de façon à maintenir à tout instant une distance minimum de 20cm entre la source de radiation (l’antenne) et toute personne physique.  Le module transmetteur ne doit pas être installé ou utilisé en concomitance avec une autre antenne ou un autre transmetteur. Tant que ces deux conditions sont réunies, il n’est pas nécessaire de procéder à des tests supplémentaires sur le transmetteur. Cependant, l’intégrateur est responsable des tests effectués sur le produit final afin de se mettre en conformité avec d’éventuelles exigences complémentaires lorsque le module est installé (exemple : émissions provenant d’appareils numériques, exigences vis-à-vis de périphériques informatiques, etc.) ; IMPORTANT : Dans le cas où ces conditions ne peuvent être satisfaites (pour certaines configurations ou installation avec un autre transmetteur), les autorisations fournies par la FCC et Industrie Canada ne sont plus valables et les numéros d’identification de la FCC et de certification d’Industrie Canada ne peuvent servir pour le produit final. Dans ces circonstances, il incombera à l’intégrateur de faire réévaluer le produit final (comprenant le transmetteur) et d’obtenir une autorisation séparée de la part de la FCC et d’Industrie Canada. Etiquetage du produit final Chaque module WF111 possède sa propre identification FCC et son propre numéro de certification IC. Si l’identification FCC et le numéro de certification IC ne sont pas visibles lorsqu’un module est installé à l’intérieur d’un autre appareil, alors l’appareil en question devra lui aussi présenter une étiquette faisant référence au module inclus. Dans ce cas, le produit final doit comporter une étiquette placée de façon visible affichant les mentions suivantes : « Contient un module transmetteur certifié FCC QOQWF111 » « Contient un module transmetteur certifié IC 5123A-BGTWF111 » ou « Inclut la certification FCC QOQWF111 »
Bluegiga Technologies Oy Page 39 of 41 « Inclut la certification IC 5123A-BGTWF111 » L’intégrateur du module WF111 ne doit utiliser que les antennes répertoriées dans le tableau 25 certifiées pour ce module. L’intégrateur est tenu de ne fournir aucune information à l’utilisateur final autorisant ce dernier à installer ou retirer le module RF, ou bien changer les paramètres RF du module, dans le manuel d’utilisation du produit final. Afin de se conformer aux limites de radiation imposées par la FCC et Industry Canada, l’antenne (ou les antennes) utilisée pour ce transmetteur doit être installée de telle sorte à maintenir une distance minimum de 20cm à tout instant entre la source de radiation (l’antenne) et les personnes physiques. En outre, cette antenne ne devra en aucun cas être installée ou utilisée en concomitance avec une autre antenne ou un autre transmetteur.
Bluegiga Technologies Oy Page 40 of 41 15.3 MIC Japan WF111 has type approval for Japan with certification ID R 209- J00061 15.4 KCC (South-Korea) WF111 has modular certification for Korean market with certification ID KCC-CRM-BGT-WF111 15.5 Qualified Antenna Types for WF111-E This device has been designed to operate with the antennas listed below, and having a maximum gain of 2.14 dBi. Antennas not included in this list or having a gain greater than 2.14 dBi are strictly prohibited for use with this device. The required antenna impedance is 50 ohms. Qualified Antenna Types for WF111-E Antenna Type Maximum Gain Dipole 2.14 dBi Inverted F-antenna 2.2 dBi Table 18: Qualified Antenna Types for WF111-E Any antenna that is of the same type and of equal or less directional gain as listed in table above can be used without a need for retesting. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that permitted for successful communication. Using an antenna of a different type or gain more than 2.14 dBi will require additional testing for FCC, CE and IC. Please, contact support@bluegiga.com for more information.
Bluegiga Technologies Oy Page 41 of 41 Contact Information Sales: www.bluegiga.com Technical Support: www.bluegiga.com/support Orders: bluegiga-orders@silabs.com WWW: www.bluegiga.com SILICON LABS Phone: +1 877.444.3032 400 West Cesar Chavez Austin, TX 78701 USA FINLAND OFFICE Phone: +358 9 435 5060 Fax: +358 9 435 50660 Sinikalliontie 5A, 5th floor 02630 Espoo, Finland

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