{"title":"Adafruit CH552 QT Py - 8051 Dev Board with STEMMA QT","handle":"adafruit-ch552-qt-py-8051-dev-board-with-stemma-qt-ada5960","url":"/products/adafruit-ch552-qt-py-8051-dev-board-with-stemma-qt-ada5960","description":"The Adafruit CH552 QT Py is a compact development board built around the WCH CH552, an enhanced 8-bit 8051 microcontroller. Running at 16 MHz with native USB device support, it packs a surprising amount of functionality into the tiny QT Py form factor with STEMMA QT / Qwiic I2C connectivity.\n\nThe CH552 features 16 KB program flash, 256 bytes of internal RAM, and 1 KB of xRAM with DMA support. Its native USB controller enables it to act as a CDC serial device or HID keyboard/mouse without additional hardware. The board is Seeed Xiao compatible in size and pinout, with castellated pads for surface-mount soldering.\n\nKey Features\n\n\nCH552 8051 Core – Enhanced 8-bit microcontroller at 16 MHz, 3.3V logic\n\n16 KB Flash / 256 B RAM / 1 KB xRAM – xRAM supports DMA\n\nNative USB Device – Full-speed USB for CDC serial, HID keyboard/mouse\n\n10 GPIO Pins – Including 4× 8-bit ADC, 3× PWM, hardware UART, hardware SPI, I2C\n\n4× Capacitive Touch – On A0–A3 pins, no additional components needed\n\nRGB NeoPixel LED – Built-in programmable LED\n\nSTEMMA QT / Qwiic – Plug-and-play I2C connector for sensors and accessories\n\nUSB-C Connector – For programming and power\n\nReset + Bootloader Buttons – Easy access to USB ROM bootloader mode\n\n3.3V Regulator – 600 mA peak output\n\nCastellated Pads – Seeed Xiao compatible for surface-mount soldering\n\n\n\nImportant: The CH552 does not run CircuitPython, MicroPython, or standard Arduino C++ libraries. A community Arduino board support package is available, but it uses a C compiler (not C++), so Arduino libraries cannot be used. This board is intended for bare-metal 8051 development and USB experimentation.\n\n\nIdeal For\n\nLearning and experimenting with 8051 architecture\nCustom USB device projects (HID, CDC serial)\nUltra-low-cost embedded USB applications\nCompact projects requiring a minimal microcontroller\n\n\nPackage Contents\n\n1× Adafruit CH552 QT Py development board\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":1032,"title":"Default Title","sku":"AF-5960","mpn":"ADA5960","price":9.82,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":100,"option1":"Default Title"}]}