Adafruit CH552 QT Py - 8051 Dev Board with STEMMA QT

The Adafruit CH552 QT Py is a compact development board featuring the enhanced 8-bit 8051 microcontroller core with native USB support. Designed for hobbyists and experimenters interested in a small, powerful board, it runs at 16 MHz with 3.3V logic and includes built-in 16K program FLASH, 256-byte internal RAM, and 1K-byte xRAM supporting DMA.

Key features include an RGB NeoPixel LED, 10 GPIO pins with 4 analog inputs, 3 PWM outputs, hardware UART, SPI, I2C via the STEMMA QT connector, 4 capacitive touch inputs, and a 600mA peak 3.3V regulator. It uses the USB Type-C connector for reliable connectivity and has reset and bootloader buttons for easy programming.

Note that this microcontroller is very minimal with no native support for CircuitPython or MicroPython and limited Arduino compatibility via a special C compiler. Perfect for those who want to explore the 8051 ecosystem on a modern small dev board.

• Same size and pinout as Seeed Xiao
• USB Type C connector
• CH552 8-bit 8051 microcontroller core with 16 MHz internal oscillator
• Built-in RGB NeoPixel LED
• 10 GPIO pins with 4 analog inputs (A0-A3), 3 PWM outputs
• I2C port with STEMMA QT connector
• Hardware UART and SPI
• 4 capacitive touch inputs on A0-A3 pins without extra components
• 3.3V regulator with 600mA peak output
• Reset and bootloader buttons
• Compact and versatile format for experimentation

Watch the product video for an overview and demos of the CH552 QT Py.