2 Pin Definitions
Table 2 – cont’d from previous page
Name No. Type
a
Function
IO42 35 I/O/T MTMS, GPIO42
RXD0 36 I/O/T U0RXD, GPIO44, CLK_OUT2
TXD0 37 I/O/T U0TXD, GPIO43, CLK_OUT1
IO2 38 I/O/T RTC_GPIO2, GPIO2, TOUCH2, ADC1_CH1
IO1 39 I/O/T RTC_GPIO1, GPIO1, TOUCH1, ADC1_CH0
GND 40 P GND
EPAD 41 P GND
a
P: power supply; I: input; O: output; T: high impedance. Pin functions in bold font are the default
pin functions.
b
In module variants that have embedded OSPI PSRAM, i.e., that embed ESP32-S3R8, pins IO35,
IO36, and IO37 connect to the OSPI PSRAM and are not available for other uses.
Espressif Systems 9
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ESP32-S3-WROOM-1 & WROOM-1U Datasheet v0.6
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