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Pin definition
themindfactory edited this page Nov 29, 2014
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5 revisions
ESP8266EX chip pinout is something like this:
Pin | Name | Type | GPIO | Function |
---|---|---|---|---|
1 | VDDA | P | Analog Power 3.0 ~3.6V | |
2 | LNA | I/O | RF Antenna Interface,Chip Output Impedance=50 Ω No matching required but we recommend that the π- type matching network is retained. | |
3 | VDD3P3 | P | Amplifier Power 3.0~3.6V | |
4 | VDD3P3 | P | Amplifier Power 3.0~3.6V | |
5 | VDD_RTC | P | NC(1.1V) | |
6 | TOUT | I | ADC Pin | |
7 | CHIP_EN | I | Chip Enable. High: On, chip works properly; Low: Off, small current | |
8 | XPD_DCDC | I/O | Deep-Sleep Wakeup;GPIO16 | |
9 | MTMS | I/O | GPIO14 | HSPICLK |
10 | MTDI | I/O | GPIO12 | HSPIQ |
11 | VDDPST | P | Digital/IO Power Supply (1.8V~3.3V) | |
12 | MTCK | I/O | GPIO13 | HSPID |
13 | MTDO | I/O | GPIO15 | HSPICS |
14 | GPIO2 | I/O | GPIO2 | UART Tx during flash progamming |
15 | GPIO0 | I/O | GPIO0 | SPICS2 |
16 | GPIO4 | I/O | GPIO4 | |
17 | VDDPST | P | Digital/IO Power Supply (1.8V~3.3V) | |
18 | SDIO_DATA_2 | I/O | Connect to SD_D2 (Series R 200Ω);SPIHD; HSPIHD | |
19 | SDIO_DATA_3 | I/O | Connect to SD_D3 (Series R 200Ω); SPIWP; HSPIWP | |
20 | SDIO_CMD | I/O | Connect to SD_CMD(Series R 200Ω); SPICS0 | |
21 | SDIO_CLK | I/O | Connect to SD_CLK (Series R 200Ω); SPICLK | |
22 | SDIO_DATA_0 | I/O | Connect to SD_D0 (Series R 200Ω); SPIQ | |
23 | SDIO_DATA_1 | I/O | Connect to SD_D1 (Series R 200Ω); SPID | |
24 | GPIO5 | I/O | GPIO5 | |
25 | U0RXD | I/O | GPIO3 | UART Rx during flash progamming |
26 | U0TXD | I/O | GPIO1 | UART Tx during flash progamming; SPICS1 |
27 | XTAL_OUT | I/O | Connect to crystal output, can be used to provide BT clock input | |
28 | XTAL_IN | I/O | Connect to crystal input | |
29 | VDDD | P | Analog Power 3.0~3.6V | |
30 | VDDA | P | Analog Power 3.0~3.6V | |
31 | RES12K | I | Connect to series R 12kΩ to ground | |
32 | EXT_RSTB | I | External reset signal (Low: Active) | |
Note: GPIO2, GPIO0, MTDO can be configurable as 3-bit SDIO mode |
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