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
ESP32-S3-WROOM-1 & WROOM-1U Datasheet v0.6