STMicroelectronics STM32 L5 Ultra-Low-Power MCUs

STMicroelectronics STM32 L5 Ultra-Low-Power MCUs are designed for an embedded application that requires more security and low power consumption. These MCUs are based on Arm® Cortex®-M33 processor and its TrustZone® for Armv8-M combined with ST security implementation. The STM32 L5 MCUs feature 512Kbytes of flash memory and 256Kbytes of SRAM. With the help of a new core and a new ST ART Acccelerator™, the STM32 L5 MCUs reaches an upgraded level of performance. These STM32 L5 MCUs offer a large portfolio with 7 packages and support up to 125°C ambient temperature.


  • Ultra-low-power with Flex Power Control:
    • 1.71V to 3.6V power supply range
    • -40°C to +85/+125°C temperature range
    • Batch Acquisition Mode (BAM)
    • 187nA in VBAT mode: supply for RTC and 32x32-bit backup registers
    • 17nA shutdown mode (5 wakeup pins)
    • 108nA standby mode (5 wakeup pins)
    • 222nA standby mode with RTC
    • 3.16μA stop 2 with RTC
    • 106μA/MHz run mode (LDO mode)
    • 62μA/MHz run mode @3V (SMPS step-down converter mode)
    • 5µs wakeup from stop mode
    • Brownout Reset (BOR) in all modes except shutdown
  • Core:
    • Arm 32-bit Cortex-M33 CPU with TrustZone and FPU
  • ART Accelerator:
    • 8-Kbyte instruction cache allowing 0-wait-state execution from Flash memory and external memories; frequency up to 110MHz, MPU, 165 DMIPS, and DSP instructions
  • Memories:
    • Up to 512Kbyte Flash and two banks read-while-write
    • 256Kbytes of SRAM including 64Kbytes with hardware parity check
    • External memory interface supporting SRAM, PSRAM, NOR, NAND, and FRAM memories
    • OCTO-SPI memory interface
  • Security:
    • Arm TrustZone and securable I/Os, memories, and peripherals
    • Flexible life cycle scheme with Readout Protection (RDP)
    • Root of trust thanks to unique boot entry and Hide Protection (HDP) area
    • Secure Firmware Installation (SFI) thanks to embedded Root Secure Services (RSS)
    • Secure firmware upgrade support with TF-M
    • HASH hardware accelerator
    • Active tamper and protection against temperature, voltage, and frequency attacks
    • True random number generator NIST SP800-90B compliant
    • 96-bit unique ID
    • 512 bytes OTP for user data
  • Clock management:
    • 4MHz to 48MHz crystal oscillator
    • 32kHz crystal oscillator for RTC (LSE)
    • Internal 16MHz factory-trimmed RC (±1%)
    • Internal low-power 32kHz RC (±5%)
    • Internal multispeed 100kHz to 48MHz oscillators and auto-trimmed by LSE (better than ±0.25% accuracy)
    • Internal 48MHz with clock recovery
    • 3 PLLs for system clock, USB, audio, and ADC

STM32 L5 Circuit Diagram

STMicroelectronics STM32 L5 Ultra-Low-Power MCUs



STMicroelectronics STM32 L5 Ultra-Low-Power MCUs
Published: 2020-01-22 | Updated: 2022-07-07