Data Sheet

3 Pin Definitions
Table 1 – cont’d from previous page
Name No. Type Function
EN 8 I
High: enables the chip
Low: the chip powers off
Note: do not leave the pin floating
I34 9 I GPIO34, ADC1_CH6, RTC_GPIO4
I35 10 I GPIO35, ADC1_CH7, RTC_GPIO5
IO32 11 I/O GPIO32, XTAL_32K_P (32.768 kHz crystal oscillator input), ADC1_CH4,
TOUCH9, RTC_GPIO9
IO33 12 I/O GPIO33, XTAL_32K_N (32.768 kHz crystal oscillator output), ADC1_CH5,
TOUCH8, RTC_GPIO8
IO25 13 I/O GPIO25, DAC_1, ADC2_CH8, RTC_GPIO6, EMAC_RXD0
IO26 14 I/O GPIO26, DAC_2, ADC2_CH9, RTC_GPIO7, EMAC_RXD1
IO27 15 I/O GPIO27, ADC2_CH7, TOUCH7, RTC_GPIO17, EMAC_RX_DV
IO14 16 I/O GPIO14, ADC2_CH6, TOUCH6, RTC_GPIO16, MTMS, HSPICLK,
HS2_CLK, SD_CLK, EMAC_TXD2
IO12 17 I/O GPIO12, ADC2_CH5, TOUCH5, RTC_GPIO15, MTDI, HSPIQ,
HS2_DATA2, SD_DATA2, EMAC_TXD3
IO13 18 I/O GPIO13, ADC2_CH4, TOUCH4, RTC_GPIO14, MTCK, HSPID,
HS2_DATA3, SD_DATA3, EMAC_RX_ER
IO15 19 I/O GPIO15, ADC2_CH3, TOUCH3, RTC_GPIO13, MTDO, HSPICS0,
HS2_CMD, SD_CMD, EMAC_RXD3
IO2 20 I/O GPIO2, ADC2_CH2, TOUCH2, RTC_GPIO12, HSPIWP, HS2_DATA0,
SD_DATA0
IO0 21 I/O GPIO0, ADC2_CH1, TOUCH1, RTC_GPIO11, CLK_OUT1,
EMAC_TX_CLK
IO4 22 I/O GPIO4, ADC2_CH0, TOUCH0, RTC_GPIO10, HSPIHD, HS2_DATA1,
SD_DATA1, EMAC_TX_ER
NC 23 - No connect
NC 24 - No connect
IO9 25 I/O GPIO9, HS1_DATA2, U1RXD, SD_DATA2
IO10 26 I/O GPIO10, HS1_DATA3, U1TXD, SD_DATA3
NC 28 - No connect
IO5 29 I/O GPIO5, HS1_DATA6, VSPICS0, EMAC_RX_CLK
IO18 30 I/O GPIO18, HS1_DATA7, VSPICLK
IO23 31 I/O GPIO23, HS1_STROBE, VSPID
IO19 32 I/O GPIO19, VSPIQ, U0CTS, EMAC_TXD0
IO22 33 I/O GPIO22, VSPIWP, U0RTS, EMAC_TXD1
IO21 34 I/O GPIO21, VSPIHD, EMAC_TX_EN
RXD0 35 I/O GPIO3, U0RXD, CLK_OUT2
TXD0 36 I/O GPIO1, U0TXD, CLK_OUT3, EMAC_RXD2
NC 37 - No connect
1
Pins GPIO6, GPIO7, GPIO8, GPIO11, GPIO16, and GPIO17 on the ESP32-U4WDH chip are connected to the
SPI flash integrated on the module and are not led out.
2
For peripheral pin configurations, please refer to ESP32 Series Datasheet.
Espressif Systems 11 ESP32-MINI-1U Datasheet v0.5