WF111-E-V1 - SILICON LABS - Datasheet.Live

WF111 Data Sheet: 802.11 B/G/N Module

WF111 is a fully integrated single 2.4 GHz 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.

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

• Single stream 2.4 GHz band

• Bit rates up to 72.2 Mbps

• Integrated antenna or U.FL connector

• Hardware support for WEP, WPA and

WPA2 encryption

• Soft-AP support

• Temperature range: -40 to +85 ºC

• SDIO or CSPI host interfaces

•Fully CE, FCC, IC, Japan and South-

Korea certified

• Operating system drivers for Linux

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1. Ordering Information

WF1 1 1- X

Antenna:

A = Internal antenna

E = External

N = RF pin

WF111 Product Numbering

Table 1.1. 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 (Please contact Silicon Labs sales at www.silabs.com for availa-

bility)

DKWF111 WF111-A SDIO evaluation kit

WF111 Data Sheet: 802.11 B/G/N Module

Ordering Information

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Table of Contents

1. Ordering Information ............................2

2. Pinout and terminal descriptions ........................5

3. Interfaces.................................8

3.1 Host interfaces .............................8

3.1.1 Host selection ............................8

3.1.2 SDIO interface ...........................8

3.1.3 CSR Serial Peripheral Interface (CSPI) ...................9

3.1.4 SDIO/CSPI deep-sleep control schemes ...................10

3.2 Other interfaces .............................10

3.2.1 Debug SPI interface ..........................10

3.2.2 I/O pads ..............................10

3.3 Power Control and Regulation ........................11

3.4 REGEN ................................12

3.5 RESET ................................12

4. Example Application Schematic .......................13

5. Wi-Fi radio ...............................15

5.1 Wi-Fi receiver ..............................15

5.2 Wi-Fi transmitter .............................15

6. Electrical characteristics ..........................16

6.1 Absolute maximum ratings .........................16

6.2 Recommended Operating Conditions ......................16

6.3 Input/Output terminal characteristics ......................17

7. RF Characteristics ............................18

8. Power Consumption ...........................20

9. Physical Dimensions ...........................21

10. Layout Guidelines ............................22

10.1 WF111-A ...............................22

10.2 WF111-E ...............................22

10.3 WF111-N ...............................23

10.4 Thermal considerations ..........................24

10.5 EMC considerations ...........................25

11. Soldering Recommendations ........................26

12. Product packaging ............................27

13. Certifications ..............................28

13.1 CE .................................28

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13.2 FCC and IC ..............................29

13.2.1 FCC et IC .............................31

13.3 MIC Japan ..............................32

13.4 KCC (South-Korea) ...........................32

13.5 Anatel (Brazil) .............................32

13.6 Qualified Antenna Types for WF111-E .....................32

14. Revision History............................. 33

14.1 Revision 1.0 ..............................33

14.2 Revision 1.1 ..............................33

14.3 Revision 1.1.1 .............................33

14.4 Revision 1.1.2 .............................33

14.5 Revision 1.1.3 .............................33

14.6 Revision 1.1.4 .............................33

14.7 Revision 1.1.5 .............................33

14.8 Revision 1.1.6 .............................33

14.9 Revision 1.1.7 .............................33

14.10 Revision 1.1.8 .............................33

14.11 Revision 1.1.9 .............................33

14.12 Revision 1.2.0 .............................33

14.13 Revision 1.2.1 .............................33

14.14 Revision 1.2.2 .............................33

14.15 Revision 1.2.3 .............................34

14.16 Revision 1.2.4 .............................34

14.17 Revision 1.2.5 .............................34

14.18 Revision 1.2.6 .............................34

14.19 Revision 1.2.7 .............................34

14.20 Revision 1.2.8 .............................34

14.21 Revision 1.2.9 .............................34

14.22 Revision 1.2.10 ............................34

14.23 Revision 1.3.0 .............................34

14.24 Revision 1.4.0 .............................34

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2. Pinout and terminal descriptions

Figure 2.1. WF111 pinout

Table 2.1. Supply Terminal Descriptions

POWER SUPPLIES PIN NUMBER DESCRIPTION

VDD_REGIN 17 Input for the internal regulators

REGEN 23 Pull high to enable internal voltage regulators (2.0 V 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

WF111 Data Sheet: 802.11 B/G/N Module

Pinout and terminal descriptions

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Table 2.2. GPIO 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.

PIO[1] 24

PIO[2] 16

PIO[3] 20

PIO[4] 18

PIO[5] 27

Table 2.3. Host Interface Terminal Descriptions

SDIO/CSPI Interfaces PIN NUMBER PAD TYPE DESCRIPTION

SDIO_DATA[0]

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]

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]

5Bi-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

6Input, weak internal

pull-up

SDIO clock

SDIO_SPI_SCLK SDIO SPI clock

CSPI_CLK CSPI clock

SDIO_CMD

7Bi-directional, weak in-

ternal pull-up

SDIO data input

SDIO_SPI_MOSI SDIO SPI data input

CSPI_MOSI CSPI data input

Table 2.4. Other Terminal Descriptions

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 coexistence antenna sharing pin. Not

supported by the firmware. Don’t connect.

WF111 Data Sheet: 802.11 B/G/N Module

Pinout and terminal descriptions

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Table 2.5. Debug SPI Terminal Descriptions

DEBUG SPI INTER-

FACE 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 Chip select, active low

WF111 Data Sheet: 802.11 B/G/N Module

Pinout and terminal descriptions

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3. Interfaces

3.1 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 con-

nection 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.

3.1.1 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.

3.1.2 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 inter-

nal registers. IO_RW_EXTENDED (CMD53) is used for block transfer to/from module MMU buffers.

Table 3.1. Supported Commands per Mode

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

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

• SD Specification Part E1 SDIO Specification v.1.10

WF111 Data Sheet: 802.11 B/G/N Module

Interfaces

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3.1.3 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 as

follows:

• 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

CSPI read/write cycles

Burst read/write cycles are used to access the MMU.

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 3.1. CSPI Register Write Cycle

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

Figure 3.2. CSPI Register Read Cycle

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.

WF111 Data Sheet: 802.11 B/G/N Module

Interfaces

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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 3.3. CSPI Burst Write Cycle

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 Burst-

Padding 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 3.4. CSPI Burst Read Cycle

3.1.4 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 availa-

ble, while attempts to access 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.

3.2 Other interfaces

3.2.1 Debug SPI interface

A separate SPI bus is provided at the module pads for device access during testing and uploading settings during application develop-

ment 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.

3.2.2 I/O pads

A number of programmable bi-directional input/outputs (I/O) are present. Some of these are usable for driving a status LED. The

PIO[0:5] logic levels are referred to the VDD_PADS supply line. All the PIO lines have internal pull-downs and should be left unconnec-

ted when not used.

WF111 Data Sheet: 802.11 B/G/N Module

Interfaces

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3.3 Power Control and Regulation

Figure 3.5. System Block Diagram

WF111 contains four linear regulators supplying clean voltages for the different parts of the system. All of them produce a 1.2 V output

voltage, and are fed from a common input, VDD_REGIN. This input can be supplied with a voltage between 1.45-2.0 V, typically 1.5 V

or 1.8 V. The VDD_REGIN supply should be relatively clean of ripple and switching spikes in order to avoid degrading the RF perform-

ance.

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 and other functions. This

can range from 1.7 V to 3.6 V. 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

1.7 V and 3.6 V. 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 2.7 V to 4.8 V 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 ca-

pable of reacting to load changes within 5 µs. Note: VDD_PA has an internal 2.2 µF 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.

In a 3.3 V logic level host system all other supplies would usually be tied to the 3.3 V supply, with a separate regulator providing the

1.45-2.0 V supply for the Wi-Fi core. A switch mode regulator with 1.5 V output is recommended for minimum power consumption.

Please see the example schematic in this datasheet.

In a 1.8 V logic level host system, all other supplies can be connected to the 1.8V supply rail except VDD_PA which should be connec-

ted to a 2.7-4.8 V 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 100 µF should be

connected close to the module.

Note: All supply voltages and ground lines must be connected.

WF111 Data Sheet: 802.11 B/G/N Module

Interfaces

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3.4 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, so the SDIO Function 0 are available even when the

core is powered off.

3.5 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 impe-

dance 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.

WF111 Data Sheet: 802.11 B/G/N Module

Interfaces

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4. Example Application Schematic

Figure 4.1. Example Application Circuit with SDIO Host Connection, 3.3 V Level Host Logic and 1.5/1.8 V 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.

WF111 Data Sheet: 802.11 B/G/N Module

Example Application Schematic

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Figure 4.2. Example Application Circuit with SDIO Host Connection, 1.8 V 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.

WF111 Data Sheet: 802.11 B/G/N Module

Example Application Schematic

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5. Wi-Fi radio

5.1 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 perform-

ance against in-band interference.

5.2 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 +14dBm 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.

WF111 Data Sheet: 802.11 B/G/N Module

Wi-Fi radio

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6. Electrical characteristics

6.1 Absolute maximum ratings

Table 6.1. 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

6.2 Recommended Operating Conditions

Table 6.2. Recommended Operating Conditions

Rating Min Max Unit

Operating temperature range1-40 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

Note:

1. The module will heat up depending on use, at high transmit duty cycles the maximum operating temperature may need to be

derated. See chapter 10.4 Thermal considerations.

WF111 Data Sheet: 802.11 B/G/N Module

Electrical characteristics

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6.3 Input/Output terminal characteristics

Table 6.3. Digital Terminal Electrical Characteristics

Digital Terminals Min Typ Max Unit

Input Voltage Levels

VIL input logic level low 1.7 V ≤ VDD ≤ 3.6 V -0.3 — 0.25*Vdd V

VIH input logic level low 1.7 V ≤ VDD ≤ 3.6 V 0.625*Vdd — VDD+0.3 V

Output Voltage Levels

VOL output logic level low 1.7 V ≤ VDD ≤ 3.6 V,

(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 the following:

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

WF111 Data Sheet: 802.11 B/G/N Module

Electrical characteristics

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7. RF Characteristics

Table 7.1. Supported Frequencies

Min max Unit

Channel 1 11

Frequency 2412 2462 MHz

Table 7.2. Supported Modulations

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 7.3. Receiver Sensitivity

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 7.4. Transmitter Output Power at Maximum Setting

Modulation type Measurement type Typical value Unit Measurement according

802.11b (1 Mbps) RMS +16 dBm FCC/IC/ETSI

802.11b (1 Mbps) Peak, max hold, 10 MHz RBW +19.6 dBm Anatel

802.11g (54 Mbps) RMS +14 dBm FCC/IC/ETSI

802.11g (54 Mbps) 20 MHz channel power, max hold, 1

MHz RBW

+20.6 dBm Anatel

802.11n (72.2 Mbps) RMS +14 dBm FCC/IC/ETSI

802.11n (72.2 Mbps) 20 MHz channel power, max hold, 1

MHz RBW

+21.1 dBm Anatel

WF111 Data Sheet: 802.11 B/G/N Module

RF Characteristics

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Table 7.5. BT Antenna Sharing Interface Properties

Operating mode Min Typ Max Unt

Switch loss (TX and RX) -2.5 -3 -3.5 dB

Table 7.6. Carrier Frequency Accuracy

Description Typ Max 802.11 limit (total error) Unit

Variation between individual units ±5 ±10 ±25 ppm

Variation with temperature ±5 ±10 ±25 ppm

WF111 Data Sheet: 802.11 B/G/N Module

RF Characteristics

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8. Power Consumption

Table 8.1. Current Consumption During Specific Operating Modes

Operating mode VDD_PA/peak VDD_PA/typ VDD_REGIN/peak VDD_REGIN/typ

Transmit (802.11b, 1M, +16 dBm) 248 mA 190 mA 240 mA 100 mA

Transmit (802.11b, 1M, +8 dBm) — 144 mA — 90 mA

Transmit (802.11g, 54M, +15 dBm) — 154 mA — 104 mA

Receive, no data 12 mA 10.5 mA 240 mA 114 mA

Deep sleep — 9 µA — 75 µA

Table 8.2. Average Current Consumption in Normal Use with Various Constant Throughputs Measured from Evaluation Board

Test Point (Preliminary)

Operating mode Bit rate Throughput (sw. limited) Current/3.3 V

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 mA1

Idle, associated 1.7 mA2

Idle, non-associated 110µA

Note:

1. The module draws about 70 mA in idle mode without power saves enabled.

2. With 100 ms beacon interval and full power save enabled. Increasing beacon interval will reduce consumption further.

WF111 Data Sheet: 802.11 B/G/N Module

Power Consumption

silabs.com | Building a more connected world. Rev. 1.4 | 20

9. Physical Dimensions

Figure 9.1. Physical Dimensions

Figure 9.2. WF111 Recommended PCB Land Pattern

WF111 Data Sheet: 802.11 B/G/N Module

Physical Dimensions

silabs.com | Building a more connected world. Rev. 1.4 | 21

10. Layout Guidelines

10.1 WF111-A

Figure 10.1. Recommended Layouts, On-Board Corner and On-Board Edge

See figure above for the suggested module layout. The impedance matching of the antenna is designed for a layout similar to the mod-

ule evaluation board. For an optimal performance of the antenna the layout should strictly follow the layout example shown in Figure

4.1 Example Application Circuit with SDIO Host Connection, 3.3 V Level Host Logic and 1.5/1.8 V Core Supply, REGEN Hard Wired to

the Core Supply and RST Pad Used to Reset the Module on page 13 and the thickness of FR4 should be between 1 and 2 mm, pref-

erably 1.6 mm.

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.

10.2 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.

WF111 Data Sheet: 802.11 B/G/N Module

Layout Guidelines

silabs.com | Building a more connected world. Rev. 1.4 | 22

10.3 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. The figure below shows a typical 50 ohm trace from the RF pin to a SMA connector.

Figure 10.2. 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. The figure below shows an example for two different 50 ohm transmission lines.

WF111 Data Sheet: 802.11 B/G/N Module

Layout Guidelines

silabs.com | Building a more connected world. Rev. 1.4 | 23

Figure 10.3. Example Cross Section of Two Different 50 ohm Transmission Line

10.4 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 ampli-

fier. 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 pref-

erably 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 tempera-

ture should be reduced due to inherent heating of the module, especially with small fully plastic enclosed applications where heat trans-

fer 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 continuous-

ly transmitting IEEE 802.11b at full power with minimal off-times and no collision detection (a worst case scenario regarding power dis-

sipation). An insufficiently cooled module will rapidly heat beyond operating range in ambient room temperature.

WF111 Data Sheet: 802.11 B/G/N Module

Layout Guidelines

silabs.com | Building a more connected world. Rev. 1.4 | 24

10.5 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. The 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 10.1 Recommended Layouts, On-Board Corner and On-Board Edge on page 22.

• When using overlapping ground areas use conductive vias separated max. 3 mm apart at the edge of the ground areas. This pre-

vents 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 resonan-

ces.

• 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.

Figure 10.4. Use of Stitching Vias to Avoid Emissions from the Edges of the PCB

WF111 Data Sheet: 802.11 B/G/N Module

Layout Guidelines

silabs.com | Building a more connected world. Rev. 1.4 | 25

11. 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.

Silicon Labs 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 fol-

lowing 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 150μm 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 0.3 mm, 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.

WF111 Data Sheet: 802.11 B/G/N Module

Soldering Recommendations

silabs.com | Building a more connected world. Rev. 1.4 | 26

12. Product packaging

WF111 Data Sheet: 802.11 B/G/N Module

Product packaging

silabs.com | Building a more connected world. Rev. 1.4 | 27

13. Certifications

WF111 is compliant to the following specifications:

13.1 CE

WF111 is in conformity with the essential requirements and other relevant requirements of the R&TTE Directive (1999/5/EC). The prod-

uct is conformity with the following standards and/or normative documents.

EMC (immunity only): EN 301 489

Radiated emissions: EN 300 328

Safety standards: EN 60950

WF111 Data Sheet: 802.11 B/G/N Module

Certifications

silabs.com | Building a more connected world. Rev. 1.4 | 28

13.2 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 specif-

ic 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 the support at www.si-

labs.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 unde-

sired 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 communi-

cation.

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 Cana-

da to operate with the antenna types listed below with the maximum permissible gain and required antenna impedance for each anten-

na type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strict-

ly 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 respon-

sible 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”

“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 mod-

ule.

WF111 Data Sheet: 802.11 B/G/N Module

Certifications

silabs.com | Building a more connected world. Rev. 1.4 | 29

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.

WF111 Data Sheet: 802.11 B/G/N Module

Certifications

silabs.com | Building a more connected world. Rev. 1.4 | 30

13.2.1 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 :

cet appareil ne doit pas créer d’interférence susceptible de causer un quelconque dommage et,

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 utilisa-

teurs finaux doivent se conformer aux instructions d’utilisation spécifiées afin de satisfaire aux normes d’exposition en matière de radio-

fréquence. 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 détaill-

ées, veuillez contacter le support technique, www.silabs.com.

Déclaration de conformité IC :

Ce matériel respecte les standards RSS exempt de licence d’Industrie Canada. Son utilisation est soumise aux deux conditions sui-

vantes :

l’appareil ne doit causer aucune interférence, et

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 utilisa-

teurs, 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 In-

dustrie 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 appartiennent sont strictement interdites d’utilisation avec ce matériel. Veuillez vous référer au tableau 22 con-

cernant 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. Ce-

pendant, l’intégrateur est responsable des tests effectués sur le produit final afin de se mettre en conformité avec d’éventuelles exigen-

ces complémentaires lorsque le module est installé (exemple : émissions provenant d’appareils numériques, exigences vis-à-vis de pé-

riphériques 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 nu-

méro 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 »

WF111 Data Sheet: 802.11 B/G/N Module

Certifications

silabs.com | Building a more connected world. Rev. 1.4 | 31

« Inclut la certification FCC QOQWF111 »

« 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.

13.3 MIC Japan

WF111 has type approval for Japan with certification ID R 209- J00061

13.4 KCC (South-Korea)

WF111 has modular certification for Korean market with certification ID KCC-CRM-BGT-WF111

13.5 Anatel (Brazil)

WF111 has type approval in Brazil with identification number 01234-16-03402.

13.6 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 inclu-

ded 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.

Table 13.1. Qualified Antenna Types for WF111-E

Qualified Antenna Types for WF111-E

Antenna Type Maximum Gain

Dipole 2.14 dBi

Inverted F-antenna 2.2 dBi

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 retest-

ing. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotrop-

ically 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 the technical support at www.silabs.com for more

information.

WF111 Data Sheet: 802.11 B/G/N Module

Certifications

silabs.com | Building a more connected world. Rev. 1.4 | 32

14. Revision History

14.1 Revision 1.0

• Initial release.

14.2 Revision 1.1

• Product codes updated.

14.3 Revision 1.1.1

• Added sleep clock specifications.

14.4 Revision 1.1.2

• Added frequency variation table.

14.5 Revision 1.1.3

• FCC and IC information added.

14.6 Revision 1.1.4

• WT111-N layout guide.

14.7 Revision 1.1.5

• Some new consumption measurements.

14.8 Revision 1.1.6

• Added CE information, corrected supported channels for default FCC version.

14.9 Revision 1.1.7

• Different coexistence pad bindings, replaced MIB keys with MIB file names.

14.10 Revision 1.1.8

• Listed supported coexistence schemes.

14.11 Revision 1.1.9

• Added tape & reel info.

14.12 Revision 1.2.0

• Removed unnecessary register information, changes to coexistence description, removed references to engineering sample ver-

sions.

14.13 Revision 1.2.1

• Repaired broken ToC.

14.14 Revision 1.2.2

• MIC Japan and KCC certification info.

WF111 Data Sheet: 802.11 B/G/N Module

Revision History

silabs.com | Building a more connected world. Rev. 1.4 | 33

14.15 Revision 1.2.3

• Improved footprint drawing.

14.16 Revision 1.2.4

• EN 300 328 V1.7.1 -> V1.8.1.

14.17 Revision 1.2.5

• Added notes on host bus layout.

14.18 Revision 1.2.6

• Part numbers updated.

14.19 Revision 1.2.7

• Contact and antenna information updated.

14.20 Revision 1.2.8

• TX power table updated.

14.21 Revision 1.2.9

• .11gn power specification fixed.

14.22 Revision 1.2.10

• Anatel measurements.

14.23 Revision 1.3.0

• Removed references to coexistence, CE standard version numbers, replaced contact information, updated Bluegiga references to

Silicon Labs.

14.24 Revision 1.4.0

August 3, 2017

• Anatel certification number added. Custom OPN support for 13 channels removed.

WF111 Data Sheet: 802.11 B/G/N Module

Revision History

silabs.com | Building a more connected world. Rev. 1.4 | 34

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Silicon Labs intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or

intending to use the Silicon Labs products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "Typical"

parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Labs reserves the right to make changes

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