ESP32-C3 Super Mini Technical Specifications

Here’s a summary of the ESP32-C3 technical specifications:

• Processor: 32-bit RISC-V CPU running up to 160 MHz
• IEEE 802.11b /g/n WiFi and Bluetooth 5 (LE) protocols
• 400KB SRAM, 384KB ROM and built-in 4M flash
• Compact SMD antenna
• 11 GPIOs that support the following interfaces:
  • 4 ADC pins
  • PWM
  • UART
  • I2C
  • SPI
• Onboard LED on GPIO 8
• Reset and Boot buttons
• Ultra low power consumption: as low as 43uA in deep sleep mode
• Small form factor

• You can also take a look at the following table:

• Microcontroller (processor)	Espressif ESP32-C3 (32-RISC-V single-core, up to 160 MHz)
  Flash Memory	4 MB (onboard SPI flash)
  SRAM	400 KB
  ROM	384 KB
  Wi-Fi	802.11 b/g/n, 2.4 GHz, up to 150 Mbps
  Bluetooth	Bluetooth 5.0 LE
  GPIO Pins	11 accessible GPIOs
  Analog Inputs (ADC)	2 × 12-bit SAR ADCs, up to 6 channels
  PWM Channels	6 channels
  SPI	3 × SPI interfaces (SPI0, SPI1 reserved)
  I2C	1 × I2C interface
  UART	2 × UART interfaces
  I2S	1 × I2S interface
  USB Interface	USB-C, supports USB CDC
  Power Supply	5V via USB-C or 3.3V–6V via VIN (5V) pin; onboard 3.3V regulator (up to 500 mA)
  Operating Voltage	3.3V (logic level for GPIOs)
  Deep Sleep Mode	43uA
  Buttons	1 × Reset button, 1 × Boot button (GPIO9)
  LED	1 × onboard LED (on GPIO8, active low)
  Programming	Arduino IDE, ESP-IDF, MicroPython, PlatformIO/pioarduino

  • ESP32-C3 Super Mini Pinout

  • The following picture shows the pinout for the ESP32-C3 Super Mini board. Please note that the pinout can change slightly depending on the manufacturer. So, double-check the pinout with the pin mapping on the silkscreen of your board.

  

  • The following table describes the pin mapping and its functions.

  • Pin	Function
    3V3	3.3V output/input (outputs 3.3V from the onboard regulator, or it is a input for external 3.3V power supply)
    5V	5V input/output (connects to the USB-C 5V or external 5V supply)
    GND	GND pin
    GPIO 0	General-purpose I/O, ADC1, PWM
    GPIO 1	General-purpose I/O, ADC1, PWM
    GPIO 2	General-purpose I/O ADC1, Strapping Pin (Boot Mode) (avoid for general use)
    GPIO 3	General-purpose I/O, PWM
    GPIO 4	General-purpose I/O, PWM, default SPI SCK pin
    GPIO 5	General-purpose I/O, PWM, default SPI MISO pin
    GPIO 6	General-purpose I/O, PWM, default SPI MOSI pin
    GPIO 7	General-purpose I/O, PWM, default SPI SS pin
    GPIO 8	Connected to the onboard LED (active low); Strapping Pin (avoid for general use); Default I2C SDA pin
    GPIO 9	Connected to BOOT Button (LOW to enter bootloader), Strapping Pin (avoid for general use) Default I2C SCL pin
    GPIO 10	General-purpose I/O, PWM
    GPIO 20	General-purpose I/O, PWM, default UART RX Pin
    GPIO 21	General-purpose I/O, PWM, default UART TX Pin

  • Strapping Pins

  • GPIO 2: a strapping to enter bootloader mode – avoid for general use.
  • GPIO 8: connected to the onboard blue LED (inverted logic/active LOW); it’s also a strapping pin;
  • GPIO 9: connected to the BOOT button – avoid for general use;

  • You can still use the strapping pins in your projects, however, you need to take into account the fluctuation of the state of these GPIOs when the ESP32 resets or enters into bootloader mode.

  • Power Pins

  • When it comes to power pins, you have one 5V, one 3V3, and a GND pin.

  • The 3V3 pin provides 3.3V from the onboard regulator or accepts 3.3V from an external power source. Similarly, the 5V pin, can be used for input to power the board, or it outputs 5V from the USB power supply.

  • PWM

  • All general-purpose GPIOs can output PWM signals.

  • Analog (ADC) Pins

  • GPIOs 0, 1, 2, 3, 4, and 5 support analog reading:

  • GPIO 0: ADC1_CH0
  • GPIO 1: ADC1_CH1
  • GPIO 2: ADC1_CH2
  • GPIO 3: ADC1_CH3
  • GPIO 4: ADC1_CH4
  • GPIO 5: ADC1_CH5

  • UART, I2C, and PWM

  • Due to the ESP32 multiplexing feature, the UART, SPI, and I2C interfaces can be assigned to nearly any GPIO.

  • However, when using Arduino IDE, and assuming you’re selecting the ESP32 C3 board in the Boards menu, it will assume the following pins as defaults:

  • UART: defaults to GPIO 20 (RX) and GPIO21 (TX)
  • SPI: defaults to GPIO6 (MISO), GPIO7 (MOSI), GPIO10 (SCK), and GPIO 5 (SS)
  • I2C: defaults to GPIO 8(SDA) and GPIO 9(SCL)

  • Board Datasheet

  • For more information about the board, you can check its datasheet in the link below:

  • ESP32-C3 Super Mini Datasheet