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STMicroelectronics STM32L4

STMicroelectronics STM32L4 series of ultra-low-power MCUs

ST has built a new architecture to reach best-in-class ultra-low-power figures thanks to its high flexibility. STM32L4 MCUs have scored 177 in the standardized EEMBC™ ULPBench®tests that compare the efficiency of ultra-low-power microcontrollers. Moreover, the STM32L4 series shatters performance limits in the ultra-low-power world. It delivers 100 DMIPS based on its ARM® Cortex®-M4 core with FPU and ST ART Accelerator™ at 80 MHz.

STM32L4 microcontrollers offer dynamic voltage scaling to balance power consumption with processing demand, low-power peripherals (LP UART, LP timers) available in Stop mode, safety and security features, smart and numerous peripherals, advanced and low-power analog peripherals such as op amps, comparators, LCD, 12-bit DACs and 16-bit ADCs (hardware oversampling).

The series are available in different lines: STM32L4x1 (Access line), STM32L4x2 (USB Device), STM32L4x3 (USB Device, LCD), STM32L4x5 (USB OTG) and STM32L4x6 (USB OTG, LCD).

To simplify migration and give you all the flexibility you need, the STM32L4 is pin-to-pin compatible with the different STM32 series and opens the door to the full STM32 ecosystem.

  • Ultra-low-power mode: 8 nA with backup registers without real-time clock (5 wakeup pins)
  • Ultra-low-power mode + RTC: 200 nA with backup registers (5 wakeup pins)
  • Ultra-low-power mode + 16 Kbytes of RAM: 170 nA
  • Ultra-low-power mode + 16 Kbytes of RAM + RTC: 450 nA
  • Dynamic run mode: down to 84 μA/MHz
  • Wake-up time: 5 μs

Key Features

  • ARM® 32-bit Cortex®-M4 CPU with FPU, up to 80 MHz
  • Ultra-low-power with FlexPowerControl
  • 1.71 V to 3.6 V power supply
  • High-speed memories: Up to 1 MB Flash, up to 128 KB of SRAM including 32 KB with hardware parity check
  • Quad SPI memory interface and external memory interface for static memories
  • 16x timers including 2x 16-bit advanced motor-control, 2x low-power 16-bit, 2x 32-bit
  • 18x communication interfaces including USB OTG 2.0 full-speed and CAN (2.0B Active)
  • Rich analog peripherals (independent supply)
  • 3× 12-bit ADC 5 Msps, up to 16-bit with hardware oversampling, 200 μA/Msps
  • 2x 12-bit DAC, low-power sample and hold
  • 2x operational amplifiers with built-in PGA and 2x ultra-low-power comparators


  • Industrial Control
  • Smart Metering
  • Motor Control
  • Smart Sensors
  • Portable devices
  • Fitness Tracker

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