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ESP8266EX Pin Definitions

Pin Definitions by pin numbers

 

Pin Name Function
1 VDDA Analog Power (LNA) 3.0 ~ 3.3V
2 LNA 50 Ohm RF Output ;  recommended to retain π-type matching network
3 VDD3P3 Power Amplifier (PA_BALUN) 3.0~3.3V
4 VDD3P3   Power Amplifier (PA_STG1) 3.0~3.3V
5 VDD_RTC   NC(1.1V)
6 TOUT   adc pin
7 CHIP_EN   Chip Enable – Active High /Chip Disable (very low power consumption) – Low
8 XPD_DCDC Deep-Sleep Wakeup/GPIO16
9 MTMS GPIO14/HSPICLK
10 MTDI GPIO12/HSPIQ
11 VDDPST Digital and IO Power(1.8V~3.3V)
12 MTCK GPIO13/HSPID
13 MTDO GPIO15/HSPICS
14 GPIO2 GPIO2/ UART_Tx (when used to programm Flash)/UART1_TX(when used as debug output);
15 GPIO0 GPIO0/SPICS2
16 GPIO4 GPIO4
17 VDDPST Digital and IO power(1.8V~3.3V)
18 SDIO_DATA_2  SD_D2 (serial 200Ω)/SPIHD/HSPIHD
19 SDIO_DATA_3 SD_D3 (serial 200Ω)/SPIWP/ HSPIWP
20 SDIO_CMD SD_CMD(serial 200Ω)/ SPICS0
21 SDIO_CLK   SD_CLK (serial 200Ω)/SPICLK
22 SDIO_DATA_0 SD_D0 (serial 200Ω)/SPIQ
23 SDIO_DATA_1 SD_D1 (serial 200Ω)/SPID
24 GPIO5 GPIO5
25 U0RXD GPIO3/UART_Rx(when used to program Flash)/UART0_RX(when used to receive data packet's)
26 U0TXD GPIO1/ UART0_TX(when used to receive data packet's)/SPICS1
27 XTAL_OUT Crystal output terminal
28 XTAL_IN Crystal input terminal
29 VDDD  Analog Power (XTAL;PLL) 3.0~3.3V
30 VDDA Analog Power  3.0~3.3V
31 RES12K Serial  12kΩ Resistor to Ground
32 EXT_RSTB External reset signal (active low)

Note:

 

UART’s harware connection

UART Pins Description
UART0 (PIN 25) U0RXD + (PIN 26) U0TXD Communications (used to send and receive data packets)
UART1 (PIN 14) GPIO2 (TXD)   Debug Print.
Information’s on this page are adapted from ESP8266_User_Manual_V0.3.pdf, Google translation of ESP8266_用户手册_V0.3.pdf You can find link to download ESP8266_用户手册_V0.3.pdf on forum esp8266.com.

 

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