Data Sheet

ManualsBrandsSparkfun Electronics ManualsInternet of Things (IoT)ESP32 Thing Development Board

2.2 Pin Description 2 PIN DEFINITIONS

Name No. Type Function

SENSOR_CAPP 6 I

GPIO37, ADC_PRE_AMP, ADC1_CH1, RTC_GPIO1

Note: Connects 270 pF capacitor from SENSOR_VP to SEN-

SOR_CAPP when used as ADC_PRE_AMP.

SENSOR_CAPN 7 I

GPIO38, ADC1_CH2, ADC_PRE_AMP, RTC_GPIO2

Note: Connects 270 pF capacitor from SENSOR_VN to SEN-

SOR_CAPN when used as ADC_PRE_AMP.

SENSOR_VN 8 I

GPIO39, ADC1_CH3, ADC_PRE_AMP, RTC_GPIO3

Note: Connects 270 pF capacitor from SENSOR_VN to SEN-

SOR_CAPN when used as ADC_PRE_AMP.

CHIP_PU 9 I

Chip Enable (Active High)

High: On, chip works properly

Low: Off, chip works at the minimum power

Note: Do not leave CHIP_PU pin floating

VDET_1 10 I GPIO34, ADC1_CH6, RTC_GPIO4

VDET_2 11 I GPIO35, ADC1_CH7, RTC_GPIO5

32K_XP 12 I/O

GPIO32, 32K_XP (32.768 kHz crystal oscillator input),

ADC1_CH4, TOUCH9, RTC_GPIO9

32K_XN 13 I/O

GPIO33, 32K_XN (32.768 kHz crystal oscillator output),

ADC1_CH5, TOUCH8, RTC_GPIO8

GPIO25 14 I/O GPIO25, DAC_1, ADC2_CH8, RTC_GPIO6, EMAC_RXD0

GPIO26 15 I/O GPIO26, DAC_2, ADC2_CH9, RTC_GPIO7, EMAC_RXD1

GPIO27 16 I/O GPIO27, ADC2_CH7, TOUCH7, RTC_GPIO17, EMAC_RX_DV

MTMS 17 I/O

GPIO14, ADC2_CH6, TOUCH6, RTC_GPIO16, MTMS, HSPI-

CLK, HS2_CLK, SD_CLK, EMAC_TXD2

MTDI 18 I/O

GPIO12, ADC2_CH5, TOUCH5, RTC_GPIO15, MTDI, HSPIQ,

HS2_DATA2, SD_DATA2, EMAC_TXD3

VDD3P3_RTC 19 P RTC IO power supply input (1.8V - 3.3V)

MTCK 20 I/O

GPIO13, ADC2_CH4, TOUCH4, RTC_GPIO14, MTCK, HSPID,

HS2_DATA3, SD_DATA3, EMAC_RX_ER

MTDO 21 I/O

GPIO15, ADC2_CH3, TOUCH3, RTC_GPIO13, MTDO,

HSPICS0, HS2_CMD, SD_CMD, EMAC_RXD3

GPIO2 22 I/O

GPIO2, ADC2_CH2, TOUCH2, RTC_GPIO12, HSPIWP,

HS2_DATA0, SD_DATA0

GPIO0 23 I/O

GPIO0, ADC2_CH1, TOUCH1, RTC_GPIO11, CLK_OUT1,

EMAC_TX_CLK

GPIO4 24 I/O

GPIO4, ADC2_CH0, TOUCH0, RTC_GPIO10, HSPIHD,

HS2_DATA1, SD_DATA1, EMAC_TX_ER

VDD_SDIO

GPIO16 25 I/O GPIO16, HS1_DATA4, U2RXD, EMAC_CLK_OUT

VDD_SDIO 26 P 1.8V or 3.3V power supply output

GPIO17 27 I/O GPIO17, HS1_DATA5, U2TXD, EMAC_CLK_OUT_180

SD_DATA_2 28 I/O GPIO9, SD_DATA2, SPIHD, HS1_DATA2, U1RXD

SD_DATA_3 29 I/O GPIO10, SD_DATA3, SPIWP, HS1_DATA3, U1TXD

SD_CMD 30 I/O GPIO11, SD_CMD, SPICS0, HS1_CMD, U1RTS

SD_CLK 31 I/O GPIO6, SD_CLK, SPICLK, HS1_CLK, U1CTS

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