User's Manual

January
2016 DocID0xxxxx Rev 0.17
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change
without notice. www.st.com
5
GPIO_10
General purpose I/O or I2C_SDA line for MFI chip
I/O
5V tolerant
6
TXD
Transmit Data
O
5V tolerant
7
GPIO_9
General purpose I/O
I/O
5V tolerant
8
RXD
Receive Data
I
5V tolerant
9
CTS
Clear to send (active low)
I
5V tolerant
10
RTS
Request to send (active low)
I
5V tolerant
11
GPIO_11
General purpose I/O
or
I2C_SCL line for MFI chip
I/O
5V tolerant
12
GPIO_12
General purpose I/O
or
I2C_SDA line for MFI chip
I/O
5V tolerant
13
GPIO_7
General purpose I/O
I/O
5V tolerant
14
GPIO_14
General purpose I/O
I/O
5V tolerant
15
GPIO_13
General purpose I/O
I/O
5V tolerant
16
LPO_OUT
Low power 32KHz oscillator output
O
17
GPIO_1
GPIO indicating BT Connection Status
o 1: BT connection is active
o 0: BT connection is not active
I/O
5V tolerant
18
GPIO_4
GPIO indicating Module Power Status
o 1: active mode
o 0: Deep Sleep Mode
I/O
5V tolerant
19
GPIO_2
General purpose I/O
I/O
5V tolerant
20
GPIO_5
General purpose I/O
I/O
5V tolerant
21
1.8V_OUT
+1.8V out (max 10mA)
22
GPIO_6
General purpose I/O
I/O
5V tolerant
23
GND
Reference ground
24
VIN
Main power supply input