TDK blu2i manual Electrical specification of the interface, Pin Signal Description

3Electrical specification of the interface

The Hirose DF12C board to board connector on the module is a 40 way double-row receptacle. The pin allocation is as follows:

Pin	Signal	Description
1	Analogue 0	1.8v Max
3	Analogue 1	1.8v Max
5	SPI_MISO	SPI bus serial
		O/P
7	SPI_CSB	SPI bus chip
		select I/P
9	SPI_CLK	SPI bus clock
		I/P
11	GND
13	RESET	Reset I/P
15	GND
17	SPI_MOSI	SPI bus serial
		I/P
19	UART_CTS	Clear to Send
		I/P
21	UART_TX	Transmit Data
		O/P
23	UART_RTS	Request to
		Send O/P
25	UART_RX	Receive Data
		I/P
27	VCC_3V3	3.3V Output
		(Note 3)
29	VCC_5V	3.6V < VIN <
		6.0V
31	N/C
33	N/C
35	N/C
37	N/C
39	VCC_1V8	1.8V Output
		(Note 3)

Pin	Signal	Description
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	I/O for Host
	_DTR
14	GPIO4	I/O for Host
		(Right LED)(2)
16	GPIO5	I/O for Host (Left
		LED) (2)
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
28	N/C
30	GND
32	RESERVED	Do not connect
34	RESERVED	Do not connect
36	GND
38	GND
40	N/C

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