8-bit cost-effective enhanced USB microcontroller CH554


CH554 is a MCS51 compatible E8051 core microcontroller, 79% instructions of CH559 is single byte or single cycle. CH554 support 24MHz Fsys,built-in 1K + 256B RAM, 16KB iFlash-ROM. CH554 provides a wealthy interface resources, including ADC, 3 timers, PWM, UART, SPI and so on. CH554 provides 6-channel capacitive detection module, which may support 6 touch keys. CH554 built-in a full-speed USB controller, which may support USB HOST mode and USB DEVICE modes.


  • Enhanced E8051 core CPU, 8-15 times faster than the standard MCS51, unique fast copy commandof the XRAM data;
  • Built-in 14KB Code Flash, 2KB forBootLoader, support USB and UART ISP;
  • Built-in 1KB XRAM and internal 256B iRAM; 128 bytes forDataFlash, support byte read and write;
  • Built-in 6-channel capacitive detection module, support 6 touch keys;
  • Built-in USB controller and USB transceiver, support USB2.0 full speed and low speed host or device mode.Support up to 64 bytes of data packets, built-in FIFO, support for DMA;
  • Support USB Type-C host and slave detection, power supply levelconfiguration;
  • 3*timer / counter, support 2-channel signal capture and 2 PWM output;
  • Provide two full duplex UART, which support high baud rate communication, and UART0 is a standard MCS51 serial port;
  • Provides one SPI communication interface, built-in FIFO, support master / slave mode;
  • Provides 4-channel 8-bit ADC, support voltage comparison;
  • Built-in 24MHz clock source and PLL, support external crystal;
  • Package: TSSOP20, MSOP10 and SOP16;

Develop resources

ISP download: USB interface or UART download

  1. CH554DS1.PDF (CH554 datasheet)
  2. ISP download software,WCHISPTool_Setup.exe
  3. CH554EVT.ZIP, including:
    • CH554 sample program (C language)
    • CH554 development board schematic and PCB diagram

relation files

file name file content
CH236DS1.PDF CH236 datasheet. CH236 supports fast charging protocols such as PD3.0/2.0, BC1.2, etc. CH236 supports AC/DC constant voltage loop and constant current loop, and has built-in DC/DC control module, with features of high integration and simplified peripherals.
WCHISPTool_Setup.exe The MCU series chip program burning software supports user program programming, verification and DataFlash operation, and supports three interfaces of USB, serial port and network.