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Based on a 32-bit Arm® Cortex®-M3 core, the APM32S103x8xB series MCUs come with computing frequency up to 96MHz and a working temperature range of -40℃ to +105℃, helping products operate stably in industrial-grade temperature scenarios. With enhanced peripheral functions and 2 built-in CANs, it supports dual CAN operation at the same time. The 5.5kV ESD meets the demand of industrial-grade high-reliability standards.



  • Arm® Cortex®-M3

  • Operates at the frequency of 96MHz

  • Supports FPU operations

  • Working temperature: -40℃~+105℃


  • Flash: 128KB

  • SRAM: 36KB


  • HSECLK: 4~16MHz external crystal/ceramic oscillators

  • LSECLK: 32.768KHz crystal/ceramic oscillator

  • HSICLK: Calibrated 8MHz

  • RC oscillator LSICLK: 40KHz RC oscillator

  • PLL: 2~16x frequency

Power Supply & Management

  • VDD range: 2.0~3.6V

  • VDDA range: 2.0~3.6V

  • VBAT supply range: 1.8V~3.6V

  • Supports POR/PDR

  • Supports programmable voltage detector

Low-power Mode

  • Supports sleep, stop, and standby modes


  • DMA-7: 1

Debug Mode

  • JTAG

  • SWD


  • Up to 80 I/Os

  • All I/Os are mappable on external interrupt vectors

  • Up to 60 I/Os are 5V tolerant inputs

Communication Peripherals

  • I2C: 2 (1Mbit/s), supports SMBus/PMBus

  • USART: 3, supports ISO7816, LIN and IrDA

  • SPI:2, with a maximum transmission rate of 18Mbps

  • CAN: 2

  • USBD: 1

Analog Peripherals

  • 12-bit ADC: 2

  • Internal Temperature Sensor: 1


  • 16-bit advanced timer: 1, supports deadband and brake input

  • 16-bit universal timer: 3, each time has 4 independent channels for input capture, output comparison, PWM and pulse counting

  • Watchdog timer: 2, a stand-alone watchdog IWDT and a window watchdog WWDT

  • SysTick: 1


  • Supports calendar function


  • QFN 36

  • LQFP 48/64/100

Documents &Development Tools

Data Sheet
User Manual
Development Board

Geehy Development Boards (including MiniBoard and EvalBoard) are equipped with everything you need to evaluate the APM32 microcontroller. Each kit comes with a variety of pins broken out to 2.54mm headers, USB type B connection, USART connection (DB9) , push buttons, accessible boot pins, and a JTAG/SWD interface for programming. 

Contact our North American team today! 
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