ESP32 Pin Resource Allocation And Usage Recommendations

# ESP32引脚资源分配与使用建议

一、ESP32-D2WD芯片

1. ESP32-D2WD特殊引脚查询表&注意事项

引脚名

芯片No.

电源

是否建议使用

原因

GPIO0

VDD3P3_RTC

不优先

Strapping Pins* 用于切换Booting Mode 复位完成后可以正常使用

GPIO2

VDD3P3_RTC

不优先

Strapping Pins* 用于切换Booting Mode 复位完成后可以正常使用

GPIO5

VDD3P3_CPU

不优先

Strapping Pins* 与MTDO 用于切换Timing of SDIO Slave

GPIO12 /MTDI

VDD3P3_RTC

不优先

Strapping Pins* 用于确认flash工作电压 1:1.8v 0:3.3v(default)

GPIO15 /MTDO

VDD3P3_RTC

不优先

Strapping Pins* 时钟相关

GPIO16*

VDD_SDIO

不建议

需查阅模组原理图 GPIO16 和 GPIO17 SD_CMD, SD_CLK, SD_DATA_0 SD_DATA_1 用于外接flash

GPIO17*

VDD_SDIO

不建议

需查阅模组原理图同上 (该引脚电压与flash供电电压一致)

GPIO 34 /VDET_1

VDD3P3_RTC

不建议

只能作为输入引脚

GPIO 35 /VDET_2

VDD3P3_RTC

不建议

只能作为输入引脚

GPIO 36 /SENSOR_VP

VDD3P3_RTC

不建议

只能作为输入引脚

GPIO 37 /SENSOR_CAPP

VDD3P3_RTC

不建议

只能作为输入引脚

GPIO 38 /SENSOR_CAPN

VDD3P3_RTC

不建议

只能作为输入引脚

GPIO 39 /SENSOR_VN

VDD3P3_RTC

不建议

只能作为输入引脚

ESP32 has five strapping pins: • MTDI • GPIO0 • GPIO2 • MTDO • GPIO5
注意GPIO16、GPIO17在ESP32-WROOM-32D模组中并没有用于连接flash,且该模组flash为3.3v,所以能够在没有其他IO资源的情况下使用.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#.

2. ESP32-D2WD芯片封装

3. ESP32-D2WD芯片引脚定义

Name

No.

Type

Function

Analog

VDDA

Analog power supply (2.3V – 3.6V)

LNA_IN

I/O

RF input and output

VDD3P3

Analog power supply (2.3V – 3.6V)

VDD3P3

Analog power supply (2.3V – 3.6V)

VDD3P3_RTC

SENSOR_VP

GPIO36, ADC1_CH0, RTC_GPIO0

SENSOR_CAPP

GPIO37, ADC1_CH1, RTC_GPIO1

SENSOR_CAPN

GPIO38, ADC1_CH2, RTC_GPIO2

SENSOR_VN

GPIO39, ADC1_CH3, RTC_GPIO3

CHIP_PU

High: On; enables the chip Low: Off; the chip powers off Note: Do not leave the

CHIP_PU pin floating

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

二、ESP32-WROOM-32D模组

ESP32-WROOM-32D(或32U)模组内置ESP32-D0WD双核芯片,40MHz晶振,32Mbit 3.3V flash 和板载天线.

1. ESP32-WROOM-32D模组特殊引脚&注意事项

遵循第一节ESP32-D2WD特殊引脚查询表&注意事项

2. ESP32-WROOM-32D优先使用引脚

优先>不优先>不建议>禁用

引脚名

芯片No.

电源

是否建议使用

备注/原因

模组左侧

GPIO34*

VDD3P3_RTC

不建议

仅输入

GPIO35*

VDD3P3_RTC

不建议

仅输入

GPIO32

VDD3P3_RTC

优先

GPIO33

VDD3P3_RTC

优先

GPIO25

VDD3P3_RTC

优先

GPIO26

VDD3P3_RTC

优先

GPIO27

VDD3P3_RTC

优先

GPIO14

VDD3P3_RTC

优先

MTMS

GPIO12*

VDD3P3_RTC

不建议

MTDI 用于选择 flash 电压

模组下侧

GPIO13

VDD3P3_RTC

优先

MTCK

GPIO15*

VDD3P3_RTC

不建议

MTDO

GPIO2*

VDD3P3_RTC

不建议

用于选择 boot mode

模组右侧

GPIO23

VDD3P3_CPU

优先

GPIO22

VDD3P3_CPU

优先

GPIO21

VDD3P3_CPU

优先

GPIO19

VDD3P3_CPU

优先

GPIO18

VDD3P3_CPU

优先

GPIO5

VDD3P3_CPU

优先

GPIO17*

VDD_SDIO

不优先

在该模组中未用于连接flash

GPIO16*

VDD_SDIO

不优先

在该模组中未用于连接flash

GPIO4

VDD3P3_RTC

优先

GPIO0*

VDD3P3_RTC

不建议

用于选择 boot mode

3. ESP32-WROOM-32D模组封装

4. ESP32-WROOM-32D模组引脚定义

名称 | 编号 | 类型 | 功能 |--|--|--|--| GND|1|P|接地 3V3|2|P|供电 EN|3|I|使能模组,高电平有效. SENSOR_VP|4|I|GPIO36,ADC1_CH0,RTC_GPIO0 SENSOR_VN|5|I|GPIO39,ADC1_CH3,RTC_GPIO3 IO34|6|I|GPIO34,ADC1_CH6,RTC_GPIO4 IO35|7|I|GPIO35,ADC1_CH7,RTC_GPIO5 IO32|8|I/O|GPIO32,XTAL_32K_P(32.768kHz晶振输入),ADC1_CH4,TOUCH9,RTC_GPIO9 IO33|9|I/O|GPIO33,XTAL_32K_N(32.768kHz晶振输出),ADC1_CH5,TOUCH8,RTC_GPIO8 IO25|10|I/O|GPIO25,DAC_1,ADC2_CH8,RTC_GPIO6,EMAC_RXD0 IO26|11|I/O|GPIO26,DAC_2,ADC2_CH9,RTC_GPIO7,EMAC_RXD1 IO27|12|I/O|GPIO27,ADC2_CH7,TOUCH7,RTC_GPIO17,EMAC_RX_DV IO14|13|I/O|GPIO14,ADC2_CH6,TOUCH6,RTC_GPIO16,MTMS,HSPICLK,HS2_CLK,SD_CLK,EMAC_TXD2 IO12|14|I/O|GPIO12,ADC2_CH5,TOUCH5,RTC_GPIO15,MTDI,HSPIQ,HS2_DATA2,SD_DATA2,EMAC_TXD3 GND|15|P|接地 IO13|16|I/O|GPIO13,ADC2_CH4,TOUCH4,RTC_GPIO14,MTCK,HSPID,HS2_DATA3,SD_DATA3,EMAC_RX_ER SHD/SD2|17|I/O|GPIO9,SD_DATA2,SPIHD,HS1_DATA2,U1RXD SWP/SD3|18|I/O|GPIO10,SD_DATA3,SPIWP,HS1_DATA3,U1TXD SCS/CMD|19|I/O|GPIO11,SD_CMD,SPICS0,HS1_CMD,U1RTS SCK/CLK|20|I/O|GPIO6,SD_CLK,SPICLK,HS1_CLK,U1CTS SDO/SD0|21|I/O|GPIO7,SD_DATA0,SPIQ,HS1_DATA0,U2RTS SDI/SD1|22|I/O|GPIO8,SD_DATA1,SPID,HS1_DATA1,U2CTS IO15|23|I/O|GPIO15,ADC2_CH3,TOUCH3,MTDO,HSPICS0,RTC_GPIO13,HS2_CMD,SD_CMD,EMAC_RXD3 IO2|24|I/O|GPIO2,ADC2_CH2,TOUCH2,RTC_GPIO12,HSPIWP,HS2_DATA0,SD_DATA0 IO0|25|I/O|GPIO0,ADC2_CH1,TOUCH1,RTC_GPIO11,CLK_OUT1,EMAC_TX_CLK IO4|26|I/O|GPIO4,ADC2_CH0,TOUCH0,RTC_GPIO10,HSPIHD,HS2_DATA1,SD_DATA1,EMAC_TX_ER IO16|27|I/O|GPIO16,HS1_DATA4,U2RXD,EMAC_CLK_OUT IO17|28|I/O|GPIO17,HS1_DATA5,U2TXD,EMAC_CLK_OUT_180 IO5|29|I/O|GPIO5,VSPICS0,HS1_DATA6,EMAC_RX_CLK IO18|30|I/O|GPIO18,VSPICLK,HS1_DATA7 IO19|31|I/O|GPIO19,VSPIQ,U0CTS,EMAC_TXD0 NC|32|-|- IO21|33|I/O|GPIO21,VSPIHD,EMAC_TX_EN RXD0|34|I/O|GPIO3,U0RXD,CLK_OUT2 TXD0|35|I/O|GPIO1,U0TXD,CLK_OUT3,EMAC_RXD2 IO22|36|I/O|GPIO22,VSPIWP,U0RTS,EMAC_TXD1 IO23|37|I/O|GPIO23,VSPID,HS1_STROBE GND|38|P|接地

5. ESP32-WROOM-32D模组原理图

参考文档:esp32-wroom-32d_esp32-wroom-32u_datasheet_cn.pdf

6. ESP32-WROOM-32D外围原理图参考设计

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最后更新于4年前