Data Sheet

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P a g e
5.4 Pin assignment
Figure 1. Pin connection
Table 4. Pin assignment
Pin Name Description I/O Note
1 GPIO1_BTCS GPIO indicating BT Connection Status
- When high, BT connection is active
- When low, BT connection is not active
O
2 GPIO2 General purpose I/O I/O 5V tolerant
3 GPIO3 General purpose I/O I/O 5V tolerant
4 GPIO4_MLPS GPIO indicating Module Low Power Status
- When high, device is in active mode
- When low, device is in low power mode
O
5 GPIO5 General purpose I/O I/O 5V tolerant
6 GPIO6 General purpose I/O I/O 5V tolerant
7 GND Reference ground NA
8 Vin Main power supply input NA
9 Boot 0 Boot 0 pin I 5V tolerant
10 RESETn Reset input (active low for 5ms) I
11 CTS / I2C SCL Request to send (active low) or I2C_SCL line for MFI
chip
I
12 RTS / I2C SDA Clear to send (active low) or I2C_SDA line for MFI chip O 5V tolerant
13 RXD Receive Data I 5V tolerant
14 TXD Transmit Data O
15 LPO Low power 32KHz oscillator input I
16 GPIO7 General purpose I/O I/O 5V tolerant
17 GPIO8 General purpose I/O I/O 5V tolerant
18 +2.1V OUT +2.1V out (max 10mA) NA