Respironics 1127941BT Radio Integration Manual

2ANZ-1127941BT | Module Integration

Module Integration

This document describes how to integrate the TI WL1831MOD radio module into a final product with a
chip Antenna in a SISO system.

The WL1831MOD is a surface mount Bluetooth and Wi-Fi combo radio module in the WL18XX family
from Texas Instruments. The module data sheet can be found at the manufacturer’s web site below:

http://www.ti.com/wireless-connectivity/simplelink-solutions/wi-fi/products.html

The module is shown below, along with the transmission line connecting it to the matching network and
chip antenna.

The module connects back to the host through multiple interfaces. All of these interfaces operate at a
nominal supply voltage of 1.8V. The pin assignments of these signals are showing in Table 1 and Figure

1.

DC Input Power:

The radio module power is regulated internally by the module. Power is applied to the VBAT_IN
terminals with a voltage in the range of 2.9-4.8V. The I/O voltage of the module is set by applying 1.8V
to the VIO_IN Terminal.

Slow Clock:

The radio requires a 32.768 kHz square wave input at the EXT_32K input terminal of the module.

Bluetooth UART:

The Bluetooth subsystem is controlled via an HCI 4-wire UART interface operating at 1.8V.

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2ANZ-1127941BT | Module Integration

Pin #

Signal

Function

Pin #

Signal

Function

1

GND 33

GND

2

NC

Reserved for future use, NC

34

GND 3

NC

Reserved for future use, NC

35

GND 4

NC

Reserved for future use, NC

36

EXT_32K

Input clock of 32.768 kHz

5

NC

Reserved for future use, NC

37

GND 6

WL_SDIO_CMD_1V8

WLAN SDIO Command

38

VIO_IN

Sets I/O voltage.

7

GND 39

GND

8

WL_SDIO_CLK

driven by host

40

WLAN_EN

Hi = Enable

9

GND 41

BT_EN

Hi = Enable

10

WL_SDIO_CMD_1V8

WLAN SDIO data bit 0

42

WL_UART_DBG

Used for Debug

11

WL_SDIO_D1_1V8

WLAN SDIO data bit 1

43

BT_UART_DBG

Used for Debug

12

WL_SDIO_D2_1V8

WLAN SDIO data bit 2

44

GND 13

WL_SDIO_D3_1V8

WLAN SDIO data bit 3

45

GND 14

WL_IRQ_1V8

WLAN SDIO IRQ

46

VBAT_IN

Power Supply Input: 2.9-4.8V

15

GND 47

VBAT_IN

Power Supply Input: 2.9-4.8V

16

GND 48

GND 17

GND 49

GND

18

RF_ANT2

NC if not used

50

BT_HCI_RTS_1V8

UART RTS to Host

19

GND 51

BT_HCI_CTS_1V8

UART CTS to Host

20

GND 52

BT_HCI_TX_1V8

UART TX to Host

Bluetooth PCM:

The Bluetooth PCM can be used for BT Audio and can operate in either a master or slave configuration.
If they are not used they should be not connected. (NC)

WLAN Host Interface

The WLAN interfaces uses a 4-bit SDIO Interface back to the host operating at 1.8V. The host must
provide PU using a 10-K resistor for all non-CLK SDIO signals.

In order to follow the wakeup/shutdown requirements, the WL_EN (pin number 40) should be
connected to host GPIO. Must be pulled high for WLAN operation. This GPIO should have internal pull­up allowing the WL18xx pin to remain high on host suspend. In order to enable WOW feature, a pull up
on the line is required during HOST shutdown.

IRQ_WL should be connected to host GPIO. This GPIO should be able to wake the host from suspend,
therefore it's better to always connect the pin (number 14) to the always on domain of the Host. The
IRQ_WL pin serves as interrupt generation from WL18xx to the host.

Table 1: Device Pinout

WLAN CDIO CLK, must be

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1001 Murry Ridge Lane
Murrysville PA 15668