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ESP8266EX Beginner's Guide
6 TOUT
7 CHIP_EN
8 XPD_DCDC
9 MTMS
10 MTDI
11 VDDPST
12 MTCK
13 MTDO
14 GPIO2
15 GPIO0
16 GPIO4
17 VDDPST
18 SDIO_DATA_2
19 SDIO_DATA_3
20 SDIO_CMD
21 SDIO_CLK
22 SDIO_DATA_0
23 SDIO_DATA_1
24 GPIO5
25 U0RXD
26 U0TXD
27 XTAL_OUT
28 XTAL_IN
29 VDDD
30 VDDA
31 RES12K
32 EXT_RSTB
Note: GPIO2, GPIO0, MTDO can be configurable as 3-bit SDIO mode
!
13
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P a g e
"
I
ADC Pin
I
Chip Enable. High: On, chip works properly; Low:
Off, small current
I/O
Deep-Sleep Wakeup；GPIO16
I/O
GPIO14; HSPICLK
I/O
GPIO12;HSPIQ
P
Digital/IO Power Supply (1.8V~3.3V)
I/O
GPIO13;HSPID
I/O
GPIO15;HSPICS
I/O
UART Tx during flash progamming; GPIO2
I/O
GPIO0;SPICS2
I/O
GPIO4
P
Digital/IO Power Supply (1.8V~3.3V)
I/O
Connect to SD_D2 (Series R 200Ω);SPIHD; HSPIHD
I/O
Connect to SD_D3 (Series R 200Ω); SPIWP; HSPIWP
I/O
Connect to SD_CMD(Series R 200Ω); SPICS0
I/O
Connect to SD_CLK (Series R 200Ω); SPICLK
I/O
Connect to SD_D0 (Series R 200Ω); SPIQ
I/O
Connect to SD_D1 (Series R 200Ω); SPID
I/O
GPIO5
I/O
UART Rx during flash progamming; GPIO3
I/O
UART Tx during flash progamming; GPIO1; SPICS1
I/O
Connect to crystal output, can be used to provide BT
clock input
I/O
Connect to crystal input
P
Analog Power 3.0~3.6V
P
Analog Power 3.0~3.6V
I
Connect to series R 12kΩ to ground
I
External reset signal (Low: Active)
"
September 17, 2014
Espressif
Systems
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