User's Manual

Pins and signal descriptions
Pin
Number
Signal Name Input/Output Description
1 3V3 Power 3.1V ‑ 3.6V main module supply
2 GND Power Ground
3 TXD Output UART interface, RXD/TXD (Serial Interface)
communications (up to 115,200 bps, 8-N-1)
4 RXD Input UART interface, RXD/TXD (Serial Interface
communications (up to 115,200 bps, 8-N-1)
5 SCL Output NC
6 SDA I/O NC
7 MISO-GPIO_16 I/O NC
8 MOSI_GPIO_17 I/O NC
9 SCK_GPIO_18 I/O NC
10 GPIO_29_SSEL I/O NC
11 NC (Test RSV) I/O NC
12 NC (Test RSV) I/O NC
13 GPIO_23_ADC1 I/O NC
14 GPIO_26_ADC4 I/O Add 10K or bigger pullup resistor and
connect to 3.3V
15 GND Power Ground
16 RF900 I/O RF I/O port, 50 ohm nominal
17 GND Power Ground
18 GPIO_27_ADC5 I/O NC
19 ATEST1_ADC3 I/O NC
20 ATEST0_ADC2 I/O NC
21 GND Power Ground
22 3V3RF Input NC
23 GND Power Ground
24 GND Power Ground
25 NC N/A NC
26 GND Power Ground
27 GND Power Ground
28 NC N/A NC
29 GND Power Ground
30 NC N/A NC
31 NC N/A NC
32 NC N/A NC