Espressif ESP8266 Series - Page 27

ESP-WROOM
There are altogether 18 pinouts. The pin distribution and definitions are listed in Table 3-1
below:
Table 3-1: ESP-WROOM-02 Pinouts
NO.
Pin name
Function
1
3V3
3.3 V 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
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). These two functions
cannot be used simultaneously.
17
IO16
GPIO16; Wake up the chipset from deep sleep mode when connected to
RST pin.
18
GND
GND
Espressif
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2016.06