Silicon Laboratories WFM200S User Manual

UG407: WFM200S Wi-Fi® Expansion Kit
User's Guide

The WFM200S Wi-Fi Expansion Kit is an excellent way to ex­plore and evaluate the WFM200S Wi-Fi Transceiver Module with
a Raspberry Pi or an EFM32 MCU for your embedded applica­tion.

The WFM200S Wi-Fi Transceiver Module is an easy to use and easy to interface Wi-Fi
Network Co-Processor (NCP). Most of the associated complexity of Wi-Fi and the pro­tocol stack is offloaded to the NCP and allows for easy Wi-Fi integration into any em­bedded system.

The kit easily integrates and brings Wi-Fi connectivity to a compatible Silicon Labs
MCU Starter Kit through the EXP header. The WFM200S Wi-Fi Expansion Kit has also
been designed after the Raspberry Pi Hardware Attached on Top (HAT) board specifi­cation, allowing the WFM200S Wi-Fi Expansion Kit to connect to a Raspberry Pi.

WFM200S EXPANSION BOARD FEATURES

• Selectable SPI or SDIO host interface

• EXP connector for interfacing Silicon
Labs Starter Kits

• Allows board detection and
identification

• Raspberry Pi compatible HAT

• 40-pin header

• HAT EEPROM for identification

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Table of Contents

1. Introduction ................................3

1.1 Kit Contents ...............................4

2. Hardware Overview .............................5

2.1 Hardware Layout .............................5

3. WFM200S Wi-Fi NCP Expansion Kit .......................6

3.1 Host Interfaces ..............................6

3.2 Power-on and Manual Reset Circuit .......................7

4. Connectors ................................8

4.1 EXP Header ...............................9

4.1.1 Pass-through EXP Header ........................9

4.1.2 EXP Header Pinout ...........................10

4.2 Raspberry Pi Connector ...........................11

4.2.1 Raspberry Pi Connector Pinout .......................12

4.3 External FEM Connector ..........................13

4.3.1 External FEM Connector Pinout .......................13

4.4 PTA Connector ..............................14

4.4.1 PTA Connector Pinout ..........................14

4.5 Secondary RF Connector ..........................14

4.6 Power Supply ..............................15

5. Schematics, Assembly Drawings, and BOM ...................16

6. Kit Revision History ............................17

6.1 SLEXP8023A Revision History ........................17

6.2 SLEXP8023C Revision History ........................17

7. Document Revision History .........................18

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UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

Introduction

1. Introduction

This user guide describes the WFM200S Wi-Fi Expansion Kit. The kit connects to either a Silicon Labs EFM32 MCU starter kit (STK), a
Silicon Labs EFR32 wireless starter kit (WSTK) or a Raspberry Pi equipped with the 40-pin Raspberry Pi hardware-attached-on-top
(HAT) connector. SDIO support is available only with selected hosts.

Figures 1.1 and 1.2 shows the kit connected to a Silicon Labs MCU STK through the Expansion Header and a Raspberry Pi, respec­tively.

Figure 1.1. WFM200S Wi-Fi Expansion Kit Connected to a Silicon Labs EFM32GG11 MCU STK

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UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

Introduction

Figure 1.2. WFM200S Wi-Fi Expansion Kit Connected to a Raspberry Pi

Note: Do not connect the kit to both a Silicon Labs MCU STK and a Raspberry Pi at the same time.

1.1 Kit Contents

The WFM200S Wi-Fi Expansion Kit comes in two versions, which differs in what's included in the box:

• SLEXP8023A:

• BRD8023A WFM200S Wi-Fi EXP Board

• 8 GB Micro-SD card with software image for Raspberry Pi 2

• SLEXP8023C:

• BRD8023A WFM200S Wi-Fi EXP Board

• 8 GB Micro-SD card with software image for Raspberry Pi 2

• Raspberry Pi 2 Model B Single-Board Computer

• Raspberry Pi Power Supply 5.1 V, 2.5 A

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2. Hardware Overview

EXP-header for
Starter Kits

Power source
select switch

Pass-through EXP-header

Not mounted

WFM200S Wi-Fi Transceiver

Raspberry Pi connector

On bottom side

Current consumption
measurement header

Not mounted

WFM200S Wi-Fi

Expansion Board

Host interface
select switch

Secondary RF output
coaxial connector

TX/RX Activity LED

External FEM header

Not mounted

PTA header

Not mounted

Reset button

2.1 Hardware Layout

The layout of the WFM200S Wi-Fi Expansion Kit is shown in the figure below.

UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

Hardware Overview

Figure 2.1. WFM200S Wi-Fi Expansion Kit Hardware Layout

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UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

WFM200S Wi-Fi NCP Expansion Kit

3. WFM200S Wi-Fi NCP Expansion Kit

The WFM200S Wi-Fi Transceiver Module is a Wi-Fi Network Co-Processor (NCP) transceiver from Silicon Labs.

3.1 Host Interfaces

SPI and SDIO are the two available host interfaces (HIF) on the WFM200S Wi-Fi Expansion Kit. A slide switch, whose state is sampled
during power-on reset or manually issued reset is used to select the interface. The slide switch must remain in the same position
throughout the duration of the session since it also controls HIF selection multiplexer circuits.

When the WFM200S Wi-Fi Expansion Kit is connected to an EFM32/EFR32 starter kit through the EXP header, the state of the HIF
selection switch can be read (but not controlled) by the kit mcu through a GPIO pin.

The WFM200S Wi-Fi Expansion Kit incorporates a set of multiplexer circuits which allows the user to use the same kit for evaluating the
WFM200S in both applications requiring SPI or SDIO connectivity to the host. These circuits will normally not be needed in an end-user
application since in most cases the interface to use will be fixed.

A simplified circuit diagram showing the host interface multiplexer circuits is shown below. The EXP_HEADER9 signal is connected to
pin 9 on the EXP header, while the HIF_OEn output enable signal is controlled by the power-on reset circuit (explained later).

Figure 3.1. Host Interface Multiplexer Circuit

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UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

WFM200S Wi-Fi NCP Expansion Kit

3.2 Power-on and Manual Reset Circuit

To ensure that the state of the host interface selection signal is sampled correctly at the rising edge of the WFM200S RESETn signal, a
power-on reset circuit has been added to the WFM200S Wi-Fi Expansion Kit. This circuit achieves this by

• Adding a delay of 1ms to the rising edge of the RESETn signal with respect to the rising edge of the power supply

• Isolating the host from the WFM200S DAT2/HIF_SEL pin during the rising edge of the RESETn signal

The figure below shows the circuit diagram for the power-on and manual reset circuit. Its functionality is as follows:

• NCP_RESETn is the active-low reset signal of the WFM200S. The WFM200S RESETn pin has an internal pull-up of approximately
43 kOhms. The on-board reset button is connected to this signal.

• HIF_SEL_CTRL is the signal from the HIF selection switch

• HIF_OEn is the active-low output enable signal of the HIF multiplexer circuits

• WF_DAT2_HIF_SEL is the combined SDIO DAT2 signal and HIF selection signal of the WFM200S

• U114 is an open-drain active low output reset monitor which with the installed capacitor connected to the CD pin keeps NCP_RE­SETn tied to ground for about 1 ms after VMCU_NCP has exceeded the threshold voltage of 0.9 V

• U115 is a tri-state output buffer with an active low output enable signal connected to NCP_RESETn which pulls the CD pin of U116
low while NCP_RESETn is low

• U116 is a push-pull active high output reset monitor which drives HIF_OEn high for 1 ms after the output of U115 is disabled

• U109 is a tri-state output buffer with an active high output enable signal which connects the HIF_SEL_CTRL signal to the
WF_DAT2_HIF_SEL signal as long as HIF_OEn is high

The NCP_RESETn signal is available on both the EXP header and the Raspberry Pi connector and can be used for issuing a manual
reset sequence by pulling it low for at least 1 ms.

Note: Reset button is effective when board is not connected to MCU or Raspberry Pi boards. When connected, change of host inter­face is effective after reboot.

Figure 3.2. Power-on and Manual Reset Circuit Diagram

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Pass-through

EXP Header

(Not Mounted)

EXP Header

Raspberry Pi

Connector

(Bottom side)

External FEM

connector

(Not Mounted)

PTA connector

(Not Mounted)

Secondary RF

output connector

Current consumption header

(Not Mounted)

UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

4. Connectors

This chapter gives an overview of the WFM200S Wi-Fi Expansion Kit connectivity and power connections.

Connectors

Figure 4.1. WFM200S Wi-Fi Expansion Kit Connector Layout

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12

4

8
6

10

3

5

9
7

12

13

14

11

1516

17

18

20 19

VMCU

SPI_MOSI / SDIO_DAT1

SPI_MISO / SDIO_DAT0

SPI_SCLK / SDIO_CMD

SPI_CS / SDIO_CLK

SPI_WIRQ / SDIO_DAT3

SDIO_DAT2

Not Connected (NC)

5V

3V3

GND

GPIO_WUP

Not Connected (NC)

RESETn

HIF_SEL_CTRL

Not Connected (NC)

Not Connected (NC)

Not Connected (NC)

BOARD_ID_SDA
BOARD_ID_SCL

Reserved (Board Identification)

WFM200S I/O Pin

UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

Connectors

4.1 EXP Header

On the left-hand side of the WFM200S Wi-Fi Expansion Kit, a right-angle female 20-pin EXP header is provided to connect to one of
Silicon Labs’ supported Starter Kits. The EXP header on the Starter Kits follows a standard which ensures that commonly used periph-

erals such as an SPI, a UART, and an I2C bus, are available on fixed locations on the connector. Additionally, the VMCU, 3V3 and 5 V
power rails are also available on the expansion header. For detailed information regarding the pinout to the expansion header on a
specific Starter Kit, consult the accompanying user’s guide.

The figure below shows how the WFM200S Wi-Fi Transceiver Module is connected to the connector and the peripheral functions that
are available.

Figure 4.2. Expansion Header

4.1.1 Pass-through EXP Header

The WFM200S Wi-Fi Expansion Kit features a footprint for a secondary EXP header. All signals from the EXP header, including those
that are not connected to any features on the WFM200S Wi-Fi Expansion Kit, are directly tied to the corresponding pins in the footprint,
allowing daisy-chaining of additional expansion boards if a connector is soldered in.

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4.1.2 EXP Header Pinout

The table below shows the pin assignments of the EXP header.

Table 4.1. EXP Header Pinout

EXP Header

Pin Function

2 WFM200S voltage domain (power switch set to EXP VMCU)

4 SPI_MOSI / SDIO_DAT1

6 SPI_MISO / SDIO_DAT0

8 SPI_SCLK / SDIO_CMD

10 SPI_CS / SDIO_CLK

12 SPI_WIRQ / SDIO_DAT3

14 SDIO_DAT2

16 Not Connected

UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

Connectors

18 Board 5 V supply. Used to supply LDO regulator.

20 Board 3V3 supply. Only used for board identification.

1 Ground

3 GPIO (WFM200S WUP)

5 Not Connected

7 GPIO (WFM200S RESETn)

9 GPIO (HIF_SEL_CTRL read access)

11 Not Connected

13 Not Connected

15 Not Connected

17 Identification of expansion boards.

19 Identification of expansion boards.

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Reserved (Board Identification)

WFM200S I/O Pin

GND

SDIO_DAT2

Not Connected (NC)

RESETn

GPIO_WIRQ

Not Connected (NC)

RPI_ID_SD

GND

SPI_SCLK

SPI_MISO

Not Connected (NC)

Not Connected (NC)

SPI_WIRQ

GND

GPIO_WUP

GND

RPI_ID_SC

Not Connected (NC)

SDIO_DAT1
SPI_CS

SPI_MOSI

3V3

SDIO_CLK

SDIO_DAT3

Not Connected (NC)

GND

Not Connected (NC)

Not Connected (NC)

Not Connected (NC)

3V3

GND

SDIO_DAT0

SDIO_CMD

GND

Not Connected (NC)

GPIO_FEM_5

GPIO_FEM_6

GND

5V
5V

4039

37

33
35

31

38

36

32
34

29

28

27

30

2625

24

23

21 22

2019

17

13
15

11

18

16

12
14

9

8

7

10

65

4

3

1 2

UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

Connectors

4.2 Raspberry Pi Connector

On the bottom side of the WFM200S Wi-Fi Expansion Kit, a dual row, female socket, 0.1" pitch connector is installed to allow the
WFM200S Wi-Fi Expansion Kit to act as a Raspberry Pi Hardware Attached on Top (HAT) board.

The figure below shows how the WFM200S Wi-Fi Transceiver Module is connected to the connector and the peripheral functions that
are available.

Figure 4.3. Raspberry Pi Connector

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UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

Connectors

4.2.1 Raspberry Pi Connector Pinout

The table below shows the pin assignments of the Raspberry Pi connector, and the port pins and peripheral functions that are available
on the WFM200S Wi-Fi Expansion Kit.

Table 4.2. Raspberry Pi Connector Pinout

Raspberry Pi Connector

Pin(s) Function Raspberry Pi Pin

1 3V3 3v3 Power

2 5 V 5 V Power

3 - Not Connected

4 5 V 5 V Power

5 - Not Connected

6 GND Ground

7 - Not Connected

8 GPIO (WFM200S FEM_6) BCM 14

9 GND Ground

10 GPIO (WFM200S FEM_5) BCM 15

11 - Not Connected

12 - Not Connected

13 SDIO_DAT3 BCM 27

14 GND Ground

15 SDIO_CLK BCM 22

16 SDIO_CMD BCM 23

17 3V3 3v3 Power

18 SDIO_DAT0 BCM 24

19 SPI_MOSI BCM 10

20 GND Ground

21 SPI_MISO BCM 9

22 SDIO_DAT1 BCM 25

23 SPI_SCLK BCM 11

24 SPI_CS BCM 8

25 GND Ground

26 - Not Connected

27 ID EEPROM SDA BCM 0

28 ID EEPROM SCL BCM 1

29 - Not Connected

30 GND Ground

31 GPIO (WFM200S WIRQ) BCM 6

32 GPIO (WFM200S WUP) BCM 12

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GND

FEM_PDET

FEM_6

FEM_5

VMCU_NCP

FEM_4

FEM_3

VMCU_NCP

9

8

7

10

65

4

3

1 2

FEM_2

FEM_1

UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

Connectors

Raspberry Pi Connector

Pin(s) Function Raspberry Pi Pin

33 GPIO (WFM200S RESETn) BCM 13

34 GND Ground

35 - Not Connected

36 SPI_WIRQ BCM 16

37 SDIO_DAT2 BCM 26

38 - Not Connected

39 GND Ground

40 - Not Connected

4.3 External FEM Connector

The WFM200S Wi-Fi Expansion Kit features a 2x5-pin 0.1" pitch connector exposing the WFM200S Wi-Fi Transceiver Module's exter­nal front-end module (FEM) interface, which allows the connection of an external FEM board using a ribbon cable.

The WFM200S Wi-Fi Expansion Kit also features a TX/RX activity indicator LED which is connected to the FEM_5 signal. By default, to
optimize power consumption, TX/RX activity LED is not enabled. PDS sections PROG_PINS_CFG and FEM_CFG should be updated
to enable this functionality.

The pinout of the connector is illustrated in the figure below.

Figure 4.4. External FEM Connector

4.3.1 External FEM Connector Pinout

The pin assignment of the external FEM connector on the board is given in the table below.

Table 4.3. External FEM Connector Pin Descriptions

Pin Number WFM200S Connection

1 VMCU_NCP

2 VMCU_NCP

3 FEM_5

4 FEM_1

5 FEM_6

6 FEM_2

7 GND

8 FEM_3

9 FEM_PDET

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10 FEM_4

PTA_STATUS / PRIORITY

PTA_RF_ACT / REQUEST

4
5

3

2

1

PTA_FREQ / RHO

PTA_TX_CONF / GRANT

GND

UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

Connectors

4.4 PTA Connector

The WFM200S' packet transfer arbitration (PTA) interface for managing coexistence in a multi-transceiver application is exposed on a
1x5-pin 0.1" pitch header on the WFM200S Wi-Fi Expansion Kit.

The pinout of the connector is illustrated in the figure below.

Figure 4.5. PTA Connector

4.4.1 PTA Connector Pinout

The pin assignment of the PTA connector on the board is given in the table below.

Table 4.4. PTA Connector Pin Descriptions

Pin Number WFM200S Connection

1 PTA_RF_ACT / REQUEST

2 PTA_TX_CONF / GRANT

3 PTA_FREQ / RHO

4 PTA_STATUS / PRIORITY

5 GND

4.5 Secondary RF Connector

The WFM200S' secondary RF output is exposed on the WFM200S Wi-Fi Expansion Kit through a Hirose u.FL coaxial connector.

For connecting the secondary RF output to an RF measurement instrument, 50 ohms resistor R641 shall be removed and a u.FL to
SMA adapter cable (not included with the kit) can be used. Examples of such adapter cables are the Taoglas CAB.721 (100 mm) or
CAB.720 (200 mm) cable assemblies.

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Expansion

Header

Raspberry Pi

Connector

Power

Switch

Low
Power
(AEM)

High
Power
(LDO)

VMCU_NCP

LDO

IN

OUT

3.3 V

5V

3V3

WFM200S

0.1Ω

5V

4

3

1 2

UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

Connectors

4.6 Power Supply

There are two ways to provide power to the kit:

• The kit can be connected to, and powered by, a Silicon Labs MCU STK

• The kit can be connected to, and powered by, a Raspberry Pi

Note: Connecting the WFM200S Wi-Fi Expansion Kit to both an EFM32/EFR32 STK and a Raspberry Pi at the same time is not a valid
option.

When connected to a Silicon Labs MCU STK, the WFM200S Wi-Fi Transceiver Module can either be powered by the VMCU rail
present on the EXP header or through an LDO regulator on board the WFM200S Wi-Fi Expansion Kit. If connected to the VMCU rail of
the starter kit, the current consumption of the WFM200S Wi-Fi Transceiver Module will be included in the starter kit's on-board Ad­vanced Energy Monitor (AEM) measurements. The LDO regulator draws power from the 5V net, and, hence, the power consumption of
the WFM200S Wi-Fi Transceiver Module will not be included in any AEM measurements performed by the MCU STK.

A mechanical power switch on the WFM200S Wi-Fi Expansion Kit is used to select between Low Power (AEM) mode and High Power
(LDO) mode. When the switch is set to Low Power (AEM) mode, the WFM200S Wi-Fi Transceiver Module is connected to the VMCU
net on the Expansion Header. When the switch is set to High Power (LDO) mode, the WFM200S Wi-Fi Transceiver Module is connec­ted to the output of the LDO. For applications requiring high power consumption or when the WFM200S Wi-Fi Expansion Kit is connec­ted to a Raspberry Pi, the power switch must be set to High Power (LDO) mode.

A 0.1 ohm current sense resistor accompanied by a 2x2-pin 0.1" unpopulated header is provided to measure the current consumption
of the WFM200S Wi-Fi Transceiver Module whenever AEM is not available or when the current consumption exceeds the measure­ment range of AEM.

The power topology is illustrated in the figure below.

Figure 4.6. WFM200S Wi-Fi Expansion Kit Power Topology

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UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

Schematics, Assembly Drawings, and BOM

5. Schematics, Assembly Drawings, and BOM

Schematics, assembly drawings, and bill of materials (BOM) are available through Simplicity Studio when the kit documentation pack­age has been installed. They are also available from the Silicon Labs website and kit page.

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SLEXP8023A

WFM200S Wi-Fi Expansion Kit

1940000224

01-11-19

A01

UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

6. Kit Revision History

The kit revision can be found printed on the kit packaging label, as outlined in the figure below.

Figure 6.1. Kit Label

6.1 SLEXP8023A Revision History

Kit Revision Released Description

Kit Revision History

A01 2019-11-01 Initial release.

6.2 SLEXP8023C Revision History

Kit Revision Released Description

A00 2019-11-01 Initial release.

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7. Document Revision History

Revision 1.0

2019-11-01

• Initial document revision.

UG407: WFM200S Wi-Fi® Expansion Kit User's Guide

Document Revision History

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Disclaimer

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
without further notice to the product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included information.
Without prior notification, Silicon Labs may update product firmware during the manufacturing process for security or reliability reasons. Such changes will not alter the specifications or the
performance of the product. Silicon Labs shall have no liability for the consequences of use of the information supplied in this document. This document does not imply or expressly grant
any license to design or fabricate any integrated circuits. The products are not designed or authorized to be used within any FDA Class III devices, applications for which FDA premarket
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