Pin Descriptions | Oki BISM2 guide

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3.2Pin 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 Signal

No.

1Analogue 0

3 Analogue 1

5SPI_MISO

7SPI_CSB

9 SPI_CLK

11 GND

13 RESET

15 GND

17 SPI_MOSI

19 UART_CTS

21 UART_TX

23 UART_RTS

25 UART_RX

27 VCC_3V3

29 VCC_5V

31 N/C

33 GPIO6 **

35 GPIO7 **

37 GPIO8 **

39 GPIO9

Notes:

Description

1.8v Max

SPI bus serial O/P

SPI bus chip select I/P

SPI bus clock I/P

Reset I/P *

SPI bus serial I/P

Clear to Send I/P

Transmit Data O/P

Request to Send O/P

Receive Data I/P

3.3V Monitor

3.6V < VIN < 7.0V

I/O for Host

Pin	Signal	Description
No.

2	GPIO1	I/O for Host.

4	GPIO2	I/O for Host

6	UART_RI	‘Ring’ Input or Output

8	UART_DCD	Input or Output

10	UART_DSR	Input

12	GPIO3/UART_DTR	I/O for Host

14	GPIO4	I/O for Host & LED

16	GPIO5	I/O for Host

18	GND

20	PCM_CLK	PCM Clock I/P

22	PCM_IN	PCM Data I/P

24	PCM_SYNC	PCM Sync I/P

26	PCM_OUT	PCM Data O/P

28N/C

30GND

32	USB / RESERVED	Do not connect

34	USB / RESERVED	Do not connect

36GND

38GND

40N/C

*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 pull- ups 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.