Entry-level 32-bit Microcontroller (MCU) based on Arm® Cortex®-M3 Core






  • Arm Cortex-M3 processor, running at frequencies of up to 72 MHz
  • Arm Cortex-M3 built-in Nested Vectored Interrupt Controller (NVIC)
  • 16 kB on-chip flash programming memory
  • 4 kB SRAM
  • In-System Programming (ISP) and In-Application Programming (IAP)
  • Selectable boot-up: USB
  • USB MSC and HID on-chip drivers
  • USB 2.0 full-speed device controller with on-chip PHY for device
  • UART with fractional baud rate generation
  • SSP controller with FIFO and multi-protocol capabilities
  • I2C-bus interface supporting full I2C-bus specification and Fast-mode Plus
  • Up to 42 General Purpose I/O (GPIO) pins
  • Four general purpose counter/timers
  • Programmable WatchDog Timer (WDT)
  • System tick timer
  • Serial Wire Debug and Serial Wire Trace port
  • High-current output driver (20 mA) on one pin
  • High-current sink drivers (20 mA) on two I2C-bus pins in Fast-mode Plus
  • Integrated PMU (Power Management Unit)
  • Three reduced power modes: Sleep, Deep-sleep, and Deep power-down
  • Single power supply (2.0 V to 3.6 V)
  • 10-bit ADC with input multiplexing among 8 pins
  • GPIO pins can be used as edge and level sensitive interrupt sources
  • Clock output function with divider
  • Processor wake-up from Deep-sleep mode via a dedicated start logic
  • Brownout detect with four separate thresholds
  • Power-On Reset (POR)
  • Integrated oscillator with an operating range of 1 MHz to 25 MHz
  • 12 MHz internal RC oscillator trimmed to 1 % accuracy
  • Programmable watchdog oscillator with a frequency range of 7.8 kHz to 1.8 MHz
  • System PLL allows CPU operation up to the maximum CPU rate
  • For USB, a second, dedicated PLL is provided
  • Code Read Protection (CRP) with different security levels
  • Individual device serial number for identification

Target Applications

  • eMetering
  • Lighting
  • Alarm systems
  • White goods



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