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ESP32C3 Datasheet(PDF) 11 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

Part # ESP32C3
Description  UltraLowPower SoC with RISCV SingleCore CPU
PDF  44 Pages
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Manufacturer  ESPRESSIF [ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.]
Direct Link  https://www.espressif.com/
Logo ESPRESSIF - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

ESP32C3 Datasheet(HTML) 11 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

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2
Pin Definition
Name
No.
Type
Power Domain
Function
CHIP_EN
7
I
VDD3P3_RTC
High: on, enables the chip.
Low: off, the chip powers off.
Note: Do not leave the CHIP_EN pin floating.
GPIO3
8
I/O/T
VDD3P3_RTC
GPIO3,
ADC1_CH3
MTMS
9
I/O/T
VDD3P3_RTC
GPIO4,
ADC1_CH4, FSPIHD,
MTMS
MTDI
10
I/O/T
VDD3P3_RTC
GPIO5,
ADC2_CH0, FSPIWP,
MTDI
VDD3P3_RTC
11
PD
—
Input power supply for RTC
MTCK
12
I/O/T
VDD3P3_CPU
GPIO6,
FSPICLK,
MTCK
MTDO
13
I/O/T
VDD3P3_CPU
GPIO7,
FSPID,
MTDO
GPIO8
14
I/O/T
VDD3P3_CPU
GPIO8
GPIO9
15
I/O/T
VDD3P3_CPU
GPIO9
GPIO10
16
I/O/T
VDD3P3_CPU
GPIO10,
FSPICS0
VDD3P3_CPU
17
PD
—
Input power supply for CPU IO
VDD_SPI
18
I/O/T/PD
VDD3P3_CPU
GPIO11,
output power supply for flash
SPIHD
19
I/O/T
VDD3P3_CPU
GPIO12, SPIHD
SPIWP
20
I/O/T
VDD3P3_CPU
GPIO13, SPIWP
SPICS0
21
I/O/T
VDD3P3_CPU
GPIO14,
SPICS0
SPICLK
22
I/O/T
VDD3P3_CPU
GPIO15,
SPICLK
SPID
23
I/O/T
VDD3P3_CPU
GPIO16,
SPID
SPIQ
24
I/O/T
VDD3P3_CPU
GPIO17,
SPIQ
GPIO18
25
I/O/T
VDD3P3_CPU
GPIO18,
USB_D­
GPIO19
26
I/O/T
VDD3P3_CPU
GPIO19,
USB_D+
U0RXD
27
I/O/T
VDD3P3_CPU
GPIO20,
U0RXD
U0TXD
28
I/O/T
VDD3P3_CPU
GPIO21,
U0TXD
XTAL_N
29
—
—
External crystal output
XTAL_P
30
—
—
External crystal input
VDDA
31
PA
—
Analog power supply
VDDA
32
PA
—
Analog power supply
GND
33
G
—
Ground
1 P
A: analog power supply; PD : power supply for RTC IO; I: input; O: output; T: high impedance.
2 Pin functions in bold font are the default pin functions in SPI boot mode.
3 Ports of embedded flash correspond to pins of ESP32-C3FN4 and ESP32-C3FH4 as follows:
• CS# = SPICS0
• IO0/DI = SPID
• IO1/DO = SPIQ
• CLK = SPICLK
• IO2/WP# = SPIWP
• IO3/HOLD# = SPIHD
These pins are not recommended for other uses.
4 For the data port connection between ESP32-C3 and external flash please refer to Section 3.4.2 Serial
Peripheral Interface (SPI).
5 The pin function in this table refers only to some fixed settings and do not cover all cases for signals that
can be input and output through the GPIO matrix. For more information on the GPIO matrix, please refer
to Chapter IO MUX and GPIO Matrix (GPIO, IO_MUX) in ESP32-C3 Technical Reference Manual.
Espressif Systems
11
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ESP32-C3 Series Datasheet v1.1



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