ESP32 datasheet(15/60 Pages) ESPRESSIF

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2. Pin Deﬁnitions

Name

No.

Type

Function

VDET_1

GPIO34, ADC1_CH6,

RTC_GPIO4

VDET_2

GPIO35, ADC1_CH7,

RTC_GPIO5

32K_XP

I/O

GPIO32, ADC1_CH4,

RTC_GPIO9,

TOUCH9,

32K_XP (32.768 kHz crystal oscillator input)

32K_XN

I/O

GPIO33, ADC1_CH5,

RTC_GPIO8,

TOUCH8,

32K_XN (32.768 kHz crystal oscillator output)

GPIO25

I/O

GPIO25, ADC2_CH8,

RTC_GPIO6,

DAC_1,

EMAC_RXD0

GPIO26

I/O

GPIO26, ADC2_CH9,

RTC_GPIO7,

DAC_2,

EMAC_RXD1

GPIO27

I/O

GPIO27, ADC2_CH7,

RTC_GPIO17, TOUCH7,

EMAC_RX_DV

MTMS

I/O

GPIO14, ADC2_CH6,

RTC_GPIO16, TOUCH6,

EMAC_TXD2,

HSPICLK,

HS2_CLK,

SD_CLK,

MTMS

MTDI

I/O

GPIO12, ADC2_CH5,

RTC_GPIO15, TOUCH5,

EMAC_TXD3,

HSPIQ,

HS2_DATA2, SD_DATA2, MTDI

VDD3P3_RTC

Input power supply for RTC IO (2.3 V – 3.6 V)

MTCK

I/O

GPIO13, ADC2_CH4,

RTC_GPIO14, TOUCH4,

EMAC_RX_ER, HSPID,

HS2_DATA3, SD_DATA3, MTCK

MTDO

I/O

GPIO15, ADC2_CH3,

RTC_GPIO13, TOUCH3,

EMAC_RXD3,

HSPICS0,

HS2_CMD,

SD_CMD,

MTDO

GPIO2

I/O

GPIO2,

ADC2_CH2,

RTC_GPIO12, TOUCH2,

HSPIWP,

HS2_DATA0, SD_DATA0

GPIO0

I/O

GPIO0,

ADC2_CH1,

RTC_GPIO11, TOUCH1,

EMAC_TX_CLK, CLK_OUT1,

GPIO4

I/O

GPIO4,

ADC2_CH0,

RTC_GPIO10, TOUCH0,

EMAC_TX_ER, HSPIHD,

HS2_DATA1, SD_DATA1

VDD_SDIO

GPIO16

I/O

GPIO16, HS1_DATA4,

U2RXD,

EMAC_CLK_OUT

VDD_SDIO

Output power supply: 1.8 V or the same voltage as VDD3P3_RTC

GPIO17

I/O

GPIO17, HS1_DATA5,

U2TXD,

EMAC_CLK_OUT_180

SD_DATA_2

I/O

GPIO9,

HS1_DATA2,

U1RXD,

SD_DATA2, SPIHD

SD_DATA_3

I/O

GPIO10, HS1_DATA3,

U1TXD,

SD_DATA3, SPIWP

SD_CMD

I/O

GPIO11, HS1_CMD,

U1RTS,

SD_CMD,

SPICS0

SD_CLK

I/O

GPIO6,

HS1_CLK,

U1CTS,

SD_CLK,

SPICLK

SD_DATA_0

I/O

GPIO7,

HS1_DATA0,

U2RTS,

SD_DATA0, SPIQ

SD_DATA_1

I/O

GPIO8,

HS1_DATA1,

U2CTS,

SD_DATA1, SPID

VDD3P3_CPU

GPIO5

I/O

GPIO5,

HS1_DATA6,

VSPICS0,

EMAC_RX_CLK

GPIO18

I/O

GPIO18, HS1_DATA7,

VSPICLK

GPIO23

I/O

GPIO23, HS1_STROBE, VSPID

VDD3P3_CPU

Input power supply for CPU IO (1.8 V – 3.6 V)

GPIO19

I/O

GPIO19, U0CTS,

VSPIQ,

EMAC_TXD0

GPIO22

I/O

GPIO22, U0RTS,

VSPIWP,

EMAC_TXD1

U0RXD

I/O

GPIO3,

U0RXD,

CLK_OUT2

U0TXD

I/O

GPIO1,

U0TXD,

CLK_OUT3,

EMAC_RXD2

GPIO21

I/O

GPIO21,

VSPIHD,

EMAC_TX_EN

Analog

VDDA

Analog power supply (2.3 V – 3.6 V)

XTAL_N

External crystal output

XTAL_P

External crystal input

VDDA

Analog power supply (2.3 V – 3.6 V)

CAP2

Connects to a 3 nF capacitor and 20 kΩ resistor in parallel to CAP1

CAP1

Connects to a 10 nF series capacitor to ground

GND

Ground

Note:

• ESP32-D2WD’s pins GPIO16, GPIO17, SD_CMD, SD_CLK, SD_DATA_0 and SD_DATA_1 are used for connecting

the embedded flash, and are not recommended for other uses.

• For a quick reference guide to using the IO_MUX, Ethernet MAC, and GIPO Matrix pins of ESP32, please refer to

Appendix ESP32 Pin Lists.

• In most cases, the data port connection between the ESP32 and external flash is as follows: SD_DATA0/SPIQ =

IO1/DO, SD_DATA1/SPID = IO0/DI, SD_DATA2/SPIHD = IO3/HOLD#, SD_DATA3/SPIWP = IO2/WP#.

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