User Manual

1 Overview
Table 2 – cont’d from previous page
Name No. Type Function
EN 3 I
High: on, enables the chip.
Low: off, the chip powers off.
Note: Do not leave the EN pin floating.
IO2 4 I/O/T
GPIO2, ADC1_CH2, FSPIQ
Internally pulled up
IO3 5 I/O/T GPIO3, ADC1_CH3
NC
6-7,
10-12,
17-22,
29-33,
36-37
— NC
IO0 8 I/O/T GPIO0, ADC1_CH0, XTAL_32K_P
IO1 9 I/O/T GPIO1, ADC1_CH1, XTAL_32K_N
IO4 13 I/O/T GPIO4, ADC1_CH4, FSPIHD, MTMS
IO5 14 I/O/T GPIO5, ADC2_CH0, FSPIWP, MTDI
IO6 16 I/O/T GPIO6, FSPICLK, MTCK
IO7 23 I/O/T GPIO7, FSPID, MTDO
IO8 24 I/O/T
GPIO8
Internally pulled up
IO9 25 I/O/T GPIO9
IO10 26 I/O/T GPIO10, FSPICS0
IO18 27 I/O/T GPIO18, USB_D-, U1RXD (user specified)
IO19 28 I/O/T GPIO19, USB_D+, U1TXD (user specified)
RXD0 34 I/O/T GPIO20, U0RXD
TXD0 35 I/O/T GPIO21, U0TXD
1
P: power supply; I: input; O: output; T: high impedance.
Espressif Systems 6 ESP32-C3-SOLO-1 User Manual v0.5