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Espressif ESP8266 Series User Manual

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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
/ 24 27
2016.06

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Espressif ESP8266 Series Specifications

General IconGeneral
RAM50 KB
Wi-Fi802.11 b/g/n
GPIO Pins17
ADC1
ADC Resolution10-bit
I2SYes
Operating Temperature-40°C to +125°C
Clock Speed80 MHz (can be overclocked to 160 MHz)
Flash MemoryExternal, up to 16 MB
Operating Voltage3.0V to 3.6V
I2CYes (software implementation)
UART2
Deep Sleep Power Consumption10 µA
DimensionsVaries depending on module
ProcessorTensilica L106 32-bit

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