Data Sheet

No.
Name
Type 1
Function
7
GND
G
Ground
8
IO7
I/O/T
GPIO7, FSPID, MTDO
9
IO6
I/O/T
GPIO6, FSPICLK, MTCK
10
IO5
I/O/T
GPIO5, ADC2_CH0, FSPIWP, MTDI
11
IO4
I/O/T
GPIO4, ADC1_CH4, FSPIHD, MTMS
12
GND
G
Ground
13
IO18
I/O/T
GPIO18, USB_D-
14
IO19
I/O/T
GPIO19, USB_D+
15
GND
G
Ground
1(1,2)
P: Power supply; I: Input; O: Output; T: High impedance.
2(1,2,3)
GPIO2, GPIO8, and GPIO9 are strapping pins of the ESP32-C3FN4 chip. These
pins are used to control several chip functions depending on binary voltage values
applied to the pins during chip power-up or system reset. For description and
application of the strapping pins, please refer to Section Strapping Pins in ESP32-
C3 Datasheet.
Pin Layout