Datasheet
Table Of Contents
- 1 Module Overview
- 2 Block Diagram
- 3 Pin Definitions
- 4 Electrical Characteristics
- 5 Module Schematics
- 6 Peripheral Schematics
- 7 Physical Dimensions and PCB Land Pattern
- 8 Product Handling
- 9 Related Documentation and Resources
- Revision History
3 Pin Definitions
Table 2 – cont’d from previous page
Name No. Type
1
Function
NC
4, 7, 9, 10,
15, 17, 24,
25, 28, 29,
32-35
— NC
IO2 5 I/O/T GPIO2, ADC1_CH2, FSPIQ
IO3 6 I/O/T GPIO3, ADC1_CH3
EN 8 I
High: on, enables the chip.
Low: off, the chip powers off.
Note: Do not leave the EN pin floating.
IO0 12 I/O/T GPIO0, ADC1_CH0, XTAL_32K_P
IO1 13 I/O/T GPIO1, ADC1_CH1, XTAL_32K_N
IO10 16 I/O/T GPIO10, FSPICS0
IO4 18 I/O/T GPIO4, ADC1_CH4, FSPIHD, MTMS
IO5 19 I/O/T GPIO5, ADC2_CH0, FSPIWP, MTDI
IO6 20 I/O/T GPIO6, FSPICLK, MTCK
IO7 21 I/O/T GPIO7, FSPID, MTDO
IO8 22 I/O/T GPIO8
IO9 23 I/O/T GPIO9
IO18 26 I/O/T GPIO18, USB_D-
IO19 27 I/O/T GPIO19, USB_D+
RXD0 30 I/O/T GPIO20, U0RXD
TXD0 31 I/O/T GPIO21, U0TXD
1
P: power supply; I: input; O: output; T: high impedance.
3.3 Strapping Pins
Note:
The content below is excerpted from Section Strapping Pins in ESP32-C3 Series Datasheet. For the strapping pin map-
ping between the chip and modules, please refer to Chapter 5 Module Schematics.
ESP32-C3 family has three strapping pins:
• GPIO2
• GPIO8
• GPIO9
Software can read the values of GPIO2, GPIO8 and GPIO9 from GPIO_STRAPPING field in GPIO_STRAP_REG
register. For register description, please refer to Section GPIO Matrix Register Summary in
ESP32-C3 Technical Reference Manual.
During the chip’s system reset, the latches of the strapping pins sample the voltage level as strapping bits of ”0”
or ”1”, and hold these bits until the chip is powered down or shut down.
Types of system reset include:
Espressif Systems 10
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ESP32-C3-MINI-1 & MINI-1U Datasheet v1.0