Datasheet

No.
Name
Type
Function
1
G
G
Ground
2
TX
I/O/T
U0TXD, GPIO43, CLK_OUT1
3
RX
I/O/T
U0RXD, GPIO44, CLK_OUT2
4
1
I/O/T
RTC_GPIO1, GPIO1, TOUCH1, ADC1_CH0
5
2
I/O/T
RTC_GPIO2, GPIO2, TOUCH2, ADC1_CH1
6
42
I/O/T
MTMS, GPIO42
7
41
I/O/T
MTDI, GPIO41, CLK_OUT1
8
40
I/O/T
MTDO, GPIO40, CLK_OUT2
9
39
I/O/T
MTCK, GPIO39, CLK_OUT3, SUBSPICS1
10
38
I/O/T
GPIO38, FSPIWP, SUBSPIWP, RGB LED
11
37
I/O/T
SPIDQS, GPIO37, FSPIQ, SUBSPIQ
12
36
I/O/T
SPIIO7, GPIO36, FSPICLK, SUBSPICLK
13
35
I/O/T
SPIIO6, GPIO35, FSPID, SUBSPID
14
0
I/O/T
RTC_GPIO0, GPIO0
15
45
I/O/T
GPIO45
16
48
I/O/T
GPIO48, SPICLK_N, SUBSPICLK_N_DIFF
17
47
I/O/T
GPIO47, SPICLK_P, SUBSPICLK_P_DIFF
18
21
I/O/T
RTC_GPIO21, GPIO21
19
20
I/O/T
RTC_GPIO20, GPIO20, U1CTS, ADC2_CH9, CLK_OUT1, USB_D+
20
19
I/O/T
RTC_GPIO19, GPIO19, U1RTS, ADC2_CH8, CLK_OUT2, USB_D-
21
G
G
Ground
22
G
G
Ground
1
P: Power supply; I: Input; O: Output; T: High impedance.
For description of function names, please refer to ESP32-S3 Series Datasheet (PDF).