STMicroelectronics – Feature-rich MCUs based on ARM Cortex-M4 core offer multiple low-power modes


The STM32L432 microcontroller from STMicroelectronics provides a wide variety of analogue peripherals and interfaces while offering energy-saving features for reducing system power consumption.

This ultra low-power MCU is based on the high-performance ARM® Cortex®-M4 32-bit processor core operating at a frequency of up to 80MHz and achieving performance of up to 100DMIPS.

The core features a floating-point unit which supports all ARM single-precision data-processing instructions and data types.

The analogue peripherals inside the STM32L432 include a fast 12-bit ADC running at 5Msamples/s, two comparators, one operational amplifier, two DAC channels and a low-power real-time clock. In addition, as many as three capacitive-sensing channels are available.

The STM32L432 implements various power- saving modes for reduced energy consumption. In shut-down mode with two Wake-up pins, the device draws just 8nA. This rises to 28nA in stand-by mode, and 280nA with the real-time clock running. It draws 84μA/MHz in run mode.

The MCU incorporates several protection mechanisms for its embedded Flash memory and SRAM: read-out protection, write protection, proprietary code read-out protection and a firewall.

The STM32L432 is available in a 32-pin QFN package with either 128kbytes or 256kbytes of Flash.


  • 176.7 ULPBench® score
  • 273.55 Coremark® benchmark
  • Maximum ambient temperature up to 125°C
  • 64kbytes of SRAM
  • Quad SPI memory interface
  • CAN 2.0B interface
  • Serial audio interface
  • Infrared interface


  • Industrial equipment
  • Consumer devices
  • Motor control



ArduinoTM connectivity support and ST Morpho headers make it easy to expand the functionality of the STM32 Nucleo open-development platform with a wide choice of specialised shields. The board is supplied with the comprehensive STM32 software library together with various packaged software examples and direct access to mbed online resources.

Orderable Part Number: NUCLEO-L432KC