Datasheet

2 Pin Definition
Name No. Type Power Domain Function
GPIO19 25 I/O/T VDD3P3_RTC RTC_GPIO19, GPIO19, U1RTS, ADC2_CH8, CLK_OUT2, USB_D
GPIO20 26 I/O/T VDD3P3_RTC RTC_GPIO20, GPIO20, U1CTS, ADC2_CH9, CLK_OUT1, USB_D+
GPIO21 27 I/O/T VDD3P3_RTC RTC_GPIO21, GPIO21
SPICS1 28 I/O/T VDD_SPI SPICS1, GPIO26
VDD_SPI 29 P
D
— Output power supply: 1.8 V or VDD3P3_RTC
SPIHD 30 I/O/T VDD_SPI SPIHD, GPIO27
SPIWP 31 I/O/T VDD_SPI SPIWP, GPIO28
SPICS0 32 I/O/T VDD_SPI SPICS0 , GPIO29
SPICLK 33 I/O/T VDD_SPI SPICLK, GPIO30
SPIQ 34 I/O/T VDD_SPI SPIQ, GPIO31
SPID 35 I/O/T VDD_SPI SPID, GPIO32
SPICLK_N 36 I/O/T VDD_SPI SPICLK_N_DIFF, GPIO48, SUBSPICLK_N_DIFF
SPICLK_P 37 I/O/T VDD_SPI SPICLK_P_DIFF, GPIO47, SUBSPICLK_P_DIFF
GPIO33 38 I/O/T VDD3P3_CPU / VDD_SPI SPIIO4, GPIO33, FSPIHD, SUBSPIHD
GPIO34 39 I/O/T VDD3P3_CPU / VDD_SPI SPIIO5, GPIO34, FSPICS0, SUBSPICS0
GPIO35 40 I/O/T VDD3P3_CPU / VDD_SPI SPIIO6, GPIO35, FSPID, SUBSPID
GPIO36 41 I/O/T VDD3P3_CPU / VDD_SPI SPIIO7, GPIO36, FSPICLK, SUBSPICLK
GPIO37 42 I/O/T VDD3P3_CPU / VDD_SPI SPIDQS, GPIO37, FSPIQ, SUBSPIQ
GPIO38 43 I/O/T VDD3P3_CPU GPIO38, FSPIWP, SUBSPIWP
MTCK 44 I/O/T VDD3P3_CPU MTCK, GPIO39, CLK_OUT3, SUBSPICS1
MTDO 45 I/O/T VDD3P3_CPU MTDO, GPIO40, CLK_OUT2
VDD3P3_CPU 46 P
D
— Input power supply for CPU IO
MTDI 47 I/O/T VDD3P3_CPU MTDI, GPIO41, CLK_OUT1
MTMS 48 I/O/T VDD3P3_CPU MTMS, GPIO42
U0TXD 49 I/O/T VDD3P3_CPU U0TXD, GPIO43, CLK_OUT1
U0RXD 50 I/O/T VDD3P3_CPU U0RXD, GPIO44, CLK_OUT2
GPIO45 51 I/O/T VDD3P3_CPU GPIO45
GPIO46 52 I/O/T VDD3P3_CPU GPIO46
XTAL_N 53 — — External crystal output
Espressif Systems 14
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ESP32-S3 Series Datasheet v1.2