BISM2 Bluetooth™

Hardware Integration Guide

Embedded Wireless Solutions Support

Center: http://ews-

support.lairdtech.com

www.lairdtech.com/bluetooth

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Laird

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3.2 Pin Descriptions

The Hirose DF12C board-to-board connector on the module is a 40-pin double-row receptacle.

The table below defines the pin functions. Note that this pin-out is as viewed from the underside of the

module.

Pin No.

Signal

Description

Pin No.

Signal

Description

1

Analogue 0

1.8 v max

2

GPIO1

I/O for Host

3

Analogue 1

1.8 v max

4

GPIO2

I/O for Host

5

SPI_MISO

SPI bus serial O/P

6

UART_RI

‘Ring’ Input or Output

7

SPI_CSB

SPI bus chip select I/P

8

UART_DCD

Input or Output

9

SPI_CLK

SPI bus clock I/P

10

UART_DSR

Input

11

GND

12

GPIO3/UART_DTR I/O for Host

13

RESET

Reset I/P*

14

GPIO4

I/O for Host & LED

15

GND

16

GPIO5

I/O for host

17

SPI_MOSI

SPI bus serial I/P

18

GND

19

UART_CTS

Clear to Send I/P

20

PCM_CLK

PCM Clock I/P

21

UART_TX

Transmit Data O/P

22

PCM_IN

PCM Data I/P

23

UART_RTS

Request to Send O/P

24

PCM_SYNC

PCM Sync I/P

25

UART_RX

Receive Data I/P

26

PCM_OUT

PCM Data O/P

27

VCC_3V3

3.3 V monitor

28

N/C

29

VCC_5V

3.6 V < VIN < 7.0 V

30

GND

31

N/C

32

USB/RESERVED

Do not connect

33

GPIO6**

I/O for host

34

USB/RESERVED

Do not connect

35

GPIO7**

I/O for host

36

GND

37

GPIO8**

I/O for host

38

GND

39

GPIO9**

I/O for host

40

N/C

Notes:

* The reset circuitry within the BISM serial modules now incorporates a brown-out detector within

the module. Customers migrating from previous modules should check their implementation, as they

may be able to simplify their external power supply design. The reset line has a fixed 10kOhm pull

down resistor to ground.

** Pins 33, 35 and 37 were N/C on BISM1. Pin 39 was a 1V8 monitor. Designers migrating between

designs should be aware that these are now available as I/O. Default configuration is as an input PIO

lines can be configured through software to be either inputs or outputs with weak or strong pullups

or pull-downs. At reset, all PIO lines are configured as inputs with weak pull-downs.

UART_RX, UART_TX, UART_CTS, UART_RTS, UART_RI, UART_DCD and UART_DSR are all 3.3v level

logic. For example, when RX and TX are idle they will be sitting at 3.3V. Conversely for handshaking

pins CTS, RTS, RI, DCD, DSR a 0v is treated as an assertion.

Pin 6 (UART_RI) is active low. It is normally 3.3v. When a remote device initiates a connection, this

pin goes low. This means that when this pin is converted to RS232 voltage levels it will have the

correct voltage level for assertion.