CH552 QT Py Development Board 8051 Dev Board with STEMMA QT Interface

Key Features

Native USB Support: Can act as CDC serial or mouse/keyboard HID device

STEMMA QT Connector: JST SH 4-pin connector for solderless I2C connections and daisy-chaining

RGB NeoPixel LED: Built-in addressable RGB LED for visual feedback

4x 8-bit ADC Inputs: Analog inputs on A0, A1, A2, and A3 pins

3x PWM Outputs: Pulse-width modulation outputs

4x Capacitive Touch: On A0-A3 pins - no external components required

Hardware UART & SPI: Full hardware support for serial communication

3.3V Regulator: 600mA peak output

Reset & Bootloader Buttons: Reset switch and bootloader button for easy programming

Castellated Pads: Can be soldered flat to a PCB

Technical Specifications

Microcontroller: WCH CH552 (enhanced E8051 core)

Architecture: 8-bit 8051 (MCS51 instruction set compatible)

Clock Speed: 16 MHz (internal oscillator)

Program Memory: 16 KB Flash

RAM: 256-byte internal RAM + 1 KB xRAM (DMA-capable)

Logic Voltage: .3V

GPIO Pins: 10

Analog Inputs: 4 x 8-bit ADC (A0, A1, A2, A3)

PWM Channels: 3 (A2/MOSI, SDA, RX, TX)

Capacitive Touch: 4 channels (A0, A1, A2, A3)

Serial Interfaces: UART, I2C (bit-banged), SPI

USB: Full-speed USB device controller

USB Connector: USB Type-C

Regulator Output: 3.3V / 600mA peak

Colour: Black

Material: PCB

Package Contents:

1* Development Board

Only the above package content, other products are not included.

Note: Light reflection and different displays may cause the colour of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.