User's Manual

2. Pin Descriptions
There are altogether 18 pin counts, the definitions of which are described in Table 2 below.
Table 2 Pin Descriptions
NO. Pin Name Function
1 3V3 3.3V power supply (VDD)
2 EN Chip enable pin. Active high.
3 IO14 GPIO14; HSPI_CLK
4 IO12 GPIO12; HSPI_MISO
5 IO13 GPIO13; HSPI_MOSI; UART0_CTS
6 IO15 GPIO15; MTDO; HSPICS; UART0_RTS
7 IO2 GPIO2; UART1_TXD
8 IO0 GPIO0
9 GND GND
10 IO4 GPIO4
11 RXD UART0_RXD; GPIO3
12 TXD UART0_TXD; GPIO1
13 GND GND
14 IO5 GPIO5
15 RST Reset the module
16 TOUT
It can be used to test the power-supply voltage of VDD3P3 (Pin3 and
Pin4) and the input power voltage of TOUT (Pin 6). However, these two
functions cannot be used simultaneously.
17 IO16 GPIO16; can be used to wake up the chipset from deep sleep mode.
18 GND GND
Note:
Table 3 UART Download Mode Table 4 Flash Boot Mode