ESP32-C3 Super Mini: high-resolution pinout, datasheet, and specs

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The ESP32-C3 Super Mini is an ultra-compact development board based on Espressif’s ESP32-C3 FN4 SoC. It features a single-core 32-bit RISC-V processor running at up to 160 MHz, integrated 2.4 GHz Wi-Fi (802.11 b/g/n) and Bluetooth 5.0 LE, and a low-power deep-sleep mode (~43 µA). With dimensions of just 22.5 × 18 mm and an onboard 3.3 V regulator, it’s ideal for space-constrained IoT and battery-powered projects.

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Board Overview

  • SoC: ESP32-C3 FN4, RISC-V single-core @ 160 MHz
  • Memory: 400 KB SRAM, 384 KB ROM, 4 MB onboard flash
  • Wireless: Wi-Fi 802.11 b/g/n, Bluetooth 5.0 LE
  • Power:
    • Input: USB-C or external 5 V (3.3–6 V)
    • Output: Regulated 3.3 V up to 500 mA
  • I/O Voltage: 3.3 V
  • Deep-sleep current: ~43 µA
  • Interfaces: ADC, PWM, SPI, I²C, UART, GPIO
  • Dimensions: 22.5 × 18 mm

Advanced Peripheral Interfaces

  • 22 or 16 programmable GPIOs
  • Digital interfaces:
    • 3 × SPI
    • 2 × UART
    • 1 × I2C
    • 1 × I2S
    • Remote control peripheral, with 2 transmit
      channels and 2 receive channels
    • LED PWM controller, with up to 6 channels
    • Full-speed USB Serial/JTAG controller
    • General DMA controller (GDMA), with 3
      transmit channels and 3 receive channels
    • 1 × TWAI® controller compatible with ISO
      11898-1 (CAN Specification 2.0)
  • Analog interfaces:
    • 2 × 12-bit SAR ADCs, up to 6 channels
    • 1 × temperature sensor
  • Timers:
    • 2 × 54-bit general-purpose timers
    • 3 × digital watchdog timers
    • 1 × analog watchdog timer
    • 1 × 52-bit system timer

Wi­Fi

  • IEEE 802.11 b/g/n-compliant
  • Supports 20 MHz, 40 MHz bandwidth in 2.4
    GHz band
  • 1T1R mode with data rate up to 150 Mbps
  • 4 × virtual Wi-Fi interfaces
  • 802.11mc FTM

Bluetooth

  • Bluetooth LE: Bluetooth 5, Bluetooth mesh
  • High power mode (21 dBm)
  • Speed: 125 Kbps, 500 Kbps, 1 Mbps, 2 Mbps
  • Advertising extensions
  • Multiple advertisement sets
  • Channel selection algorithm
  • Internal co-existence mechanism between Wi-Fi
    and Bluetooth to share the same antenna

Security

  • Secure boot
  • Flash encryption
  • 4096-bit OTP, up to 1792 bits for use
  • Cryptographic hardware acceleration:
    • AES-128/256 (FIPS PUB 197)
  • Permission Control
  • SHA Accelerator (FIPS PUB 180-4)
  • RSA Accelerator
  • Random Number Generator (RNG)
  • HMAC
  • Digital signature

Technical Specifications

CategoryDetails
MicrocontrollerESP32-C3 FN4 (32-bit RISC-V) @ 160 MHz
Flash4 MB onboard
SRAM / ROM400 KB / 384 KB
Wi-Fi2.4 GHz 802.11 b/g/n
BluetoothBluetooth 5.0 LE
ADCADC1 (6 channels), 12-bit resolution
PWMAvailable on most GPIOs
SPI1× hardware SPI, software-remappable pins
I²C2× software I²C buses, SDA/SCL assignable
UART2× UART interfaces; USB-serial via CH340 (USB-C)
Power Regulator3.3 V output up to 500 mA
Dimensions22.5 × 18 mm
Deep-sleep Current~43 µA

PINs

UART (Universal Asynchronous Receiver-Transmitter) pins:

  • U0RXD (GPIO20): This pin serves as the UART0 receive (RX) pin, which is used for receiving serial data.
  • U0TXD (GPIO21): This pin serves as the UART0 transmit (TX) pin, which is used for transmitting serial data.

I2C (Inter-Integrated Circuit) pins: The ESP32-C3 does not have dedicated I2C pins. However, you can implement software-based I2C (bit-banging) using any available GPIO pins. For instance, you could use GPIO12 (SPIHD) and GPIO13 (SPIWP) for the I2C SCL (clock) and SDA (data

How to

  1. ESP32: pinout, specs and Arduino IDE configuration
  2. ESP32: integrated SPIFFS Filesystem
  3. ESP32: manage multiple Serial and logging
  4. ESP32 practical power saving
    1. ESP32 practical power saving: manage WiFi and CPU
    2. ESP32 practical power saving: modem and light sleep
    3. ESP32 practical power saving: deep sleep and hibernation
    4. ESP32 practical power saving: preserve data, timer and touch wake up
    5. ESP32 practical power saving: external and ULP wake up
    6. ESP32 practical power saving: UART and GPIO wake up
  5. ESP32: integrated LittleFS FileSystem
  6. ESP32: integrated FFat (Fat/exFAT) FileSystem
  7. ESP32-wroom-32
    1. ESP32-wroom-32: flash, pinout, specs and IDE configuration
  8. ESP32-CAM
    1. ESP32-CAM: pinout, specs and Arduino IDE configuration
    2. ESP32-CAM: upgrade CamerWebServer with flash features
  9. ESP32: use ethernet w5500 with plain (HTTP) and SSL (HTTPS)
  10. ESP32: use ethernet enc28j60 with plain (HTTP) and SSL (HTTPS)
  11. How to use SD card with esp32
  12. esp32 and esp8266: FAT filesystem on external SPI flash memory
  1. Firmware and OTA update management
    1. Firmware management
      1. ESP32: flash compiled firmware (.bin)
      2. ESP32: flash compiled firmware and filesystem (.bin) with GUI tools
    2. OTA update with Arduino IDE
      1. ESP32 OTA update with Arduino IDE: filesystem, firmware, and password
    3. OTA update with Web Browser
      1. ESP32 OTA update with Web Browser: firmware, filesystem, and authentication
      2. ESP32 OTA update with Web Browser: upload in HTTPS (SSL/TLS) with self-signed certificate
      3. ESP32 OTA update with Web Browser: custom web interface
    4. Self OTA uptate from HTTP server
      1. ESP32 self OTA update firmware from the server
      2. ESP32 self OTA update firmware from the server with version check
      3. ESP32 self-OTA update in HTTPS (SSL/TLS) with trusted self-signed certificate
    5. Non-standard Firmware update
      1. ESP32 firmware and filesystem update from SD card
      2. ESP32 firmware and filesystem update with FTP client
  1. Integrating LAN8720 with ESP32 for Ethernet Connectivity with plain (HTTP) and SSL (HTTPS)
  2. Connecting the EByte E70 to ESP32 c3/s3 devices and a simple sketch example
  3. ESP32-C3: pinout, specs and Arduino IDE configuration
  4. Integrating W5500 with ESP32 Using Core 3: Native Ethernet Protocol Support with SSL and Other Features
  5. Integrating LAN8720 with ESP32 Using Core 3: Native Ethernet Protocol Support with SSL and Other Features
  6. Dallas ds18b20:
  7. Guide to I2C on ESP32: Communication with Heterogeneous 5V and 3.3V Devices, Additional Interface Management and Scanner
  8. Display

Datasheet

ESP32c3 datasheet

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ESP32-C3-SuperMini Schematic

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PCB size

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