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Ultra-low-power with FPU Arm Cortex-M33 with Trust Zone, MCU 110 MHz with 256 kbytes of Flash memory

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Product overview


The STM32L552xx devices are an ultra-low-power microcontrollers family (STM32L5 Series) based on the high-performance Arm® Cortex®-M33 32-bit RISC core. They operate at a frequency of up to 110 MHz.

The Cortex®-M33 core features a single-precision floating-point unit (FPU), which supports all the Arm® single-precision data-processing instructions and all the data types. The Cortex®-M33 core also implements a full set of DSP (digital signal processing) instructions and a memory protection unit (MPU) which enhances the application’s security.

These devices embed high-speed memories (512 Kbytes of Flash memory and 256 Kbytes of SRAM), a flexible external memory controller (FSMC) for static memories (for devices with packages of 100 pins and more), an Octo-SPI Flash memories interface (available on all packages) and an extensive range of enhanced I/Os and peripherals connected to two APB buses, two AHB buses and a 32-bit multi-AHB bus matrix.

The STM32L5 Series devices offer security foundation compliant with the trusted based security architecture (TBSA) requirements from Arm. They embed the necessary security features to implement a secure boot, secure data storage, secure firmware installation and secure firmware upgrade. Flexible life cycle is managed thanks to multiple levels of readout protection. Firmware hardware isolation is supported thanks to securable peripherals, memories and I/Os, and also to the possibility to configure the peripherals and memories as “privilege”.

The STM32L552xx devices embed several protection mechanisms for embedded Flash memory and SRAM: readout protection, write protection, secure and hidden protection areas.

The STM32L552xx devices embed peripherals reinforcing security:

- One HASH hardware accelerator

- One true random number generator

The STM32L5 Series devices offer active tamper detection and protection against transient and environmental perturbation attacks thanks to several internal monitoring which generate secret data erase in case of attack. This helps to fit the PCI requirements for point of sales applications. These devices offer two fast 12-bit ADC (5 Msps), two comparators, two operational amplifiers, two DAC channels, an internal voltage reference buffer, a low-power RTC, two general-purpose 32-bit timer, two 16-bit PWM timers dedicated to motor control, seven general-purpose 16-bit timers, and two 16-bit low-power timers. The devices support four digital filters for external sigma delta modulators (DFSDM). In addition, up to 22 capacitive sensing channels are available.

STM32L5 Series also feature standard and advanced communication interfaces such as:

- Four I2Cs

- Three SPIs

- Three USARTs, two UARTs and one low-power UART

- Two SAIs



- USB device FS

- USB Type-C / USB power delivery controller

The devices operate in the -40 to +85 °C (+105 °C junction) and -40 to +125 °C (+130 °C junction) temperature ranges from a 1.71 to 3.6 V power supply. A comprehensive set of power-saving modes allows the design of low-power applications.

Some independent power supplies are supported like an analog independent supply input for ADC, DAC, OPAMPs and comparators, a 3.3 V dedicated supply input for USB and up to 14 I/Os, which can be supplied independently down to 1.08 V. A VBAT input allows the backup of the RTC and the backup of the registers.

The STM32L552xx devices offer seven packages from 48-pin to 144-pin.

  • All features

    • Ultra-low-power with FlexPowerControl
      • 1.71 V to 3.6 V power supply
      • -40 °C to 85/125 °C temperature range
      • Batch acquisition mode (BAM)
      • 187 nA in VBAT mode: supply for RTC and 32x32-bit backup registers
      • 17 nA Shutdown mode (5 wakeup pins)
      • 108 nA Standby mode (5 wakeup pins)
      • 222 nA Standby mode with RTC
      • 3.16 μA Stop 2 with RTC
      • 106 μA/MHz Run mode (LDO mode)
      • 62 μA/MHz Run mode @ 3 V (SMPS step-down converter mode)
      • 5 µs 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 110 MHz, MPU, 165 DMIPS and DSP instructions
    • Performance benckmark
      • 1.5 DMIPS/MHz (Drystone 2.1)
      • 442 CoreMark® (4.02 CoreMark®/MHz)
    • Energy benchmark
      • 370 ULPMark-CP® score
      • 54 ULPMark-PP® score
      • 27400 SecureMark-TLS® score
    • Memories
      • Up to 512-Kbyte Flash, two banks read-while-write
      • 256 Kbytes of SRAM including 64 Kbytes with hardware parity check
      • External memory interface supporting SRAM, PSRAM, NOR, NAND and FRAM memories
      • OCTOSPI memory interface
    • Security
      • Arm® TrustZone® and securable I/Os, memories and peripherals
      • Flexible life cycle scheme with RDP (readout protection)
      • Root of trust thanks to unique boot entry and hide protection area (HDP)
      • SFI (secure firmware installation) thanks to embedded RSS (root secure services)
      • 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-byte OTP (one-time programmable) for user data
    • General-purpose input/outputs
      • Up to 114 fast I/Os with interrupt capability most 5 V-tolerant and up to 14 I/Os with independent supply down to 1.08 V
    • Power management
      • Embedded regulator (LDO) with three configurable range output to supply the digital circuitry
      • Embedded SMPS step-down converter
      • External SMPS support
    • Clock management
      • 4 to 48 MHz crystal oscillator
      • 32 kHz crystal oscillator for RTC (LSE)
      • Internal 16 MHz factory-trimmed RC (±1%)
      • Internal low-power 32 kHz RC (±5%)
      • Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by LSE (better than ±0.25% accuracy)
      • Internal 48 MHz with clock recovery
      • 3 PLLs for system clock, USB, audio, ADC
    • Up to 16 timers and 2 watchdogs
      • 16x timers: 2 x 16-bit advanced motor-control, 2 x 32-bit and 5 x 16-bit general purpose, 2x 16-bit basic, 3x low-power 16-bit timers (available in Stop mode), 2x watchdogs, 2x SysTick timer
      • RTC with hardware calendar, alarms and calibration
    • Up to 19 communication peripherals
      • 1x USB Type-C™/ USB power delivery controller
      • 1x USB 2.0 full-speed crystal less solution, LPM and BCD
      • 2x SAIs (serial audio interface)
      • 4x I2C FM+(1 Mbit/s), SMBus/PMBus™
      • 6x USARTs (ISO 7816, LIN, IrDA, modem)
      • 3x SPIs (7x SPIs with USART and OCTOSPI in SPI mode)
      • 1x FDCAN controller
      • 1x SDMMC interface
    • 2 DMA controllers
      • 14 DMA channels
    • Up to 22 capacitive sensing channels
      • Support touch key, linear and rotary touch sensors
    • Rich analog peripherals (independent supply)
      • 2x 12-bit ADC 5 Msps, up to 16-bit with hardware oversampling, 200 µA/Msps
      • 2x 12-bit DAC outputs, low-power sample and hold
      • 2x operational amplifiers with built-in PGA
      • 2x ultra-low-power comparators
      • 4x digital filters for sigma delta modulator
    • CRC calculation unit
    • Debug
      • Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™ (ETM)

Circuit Diagram

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STMicroelectronics - STM32L552ZC

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Quality and Reliability

Part Number Marketing Status Package SMPS Grade RoHS Compliance Grade Material Declaration**
LQFP 144 20x20x1.4 mm - Industrial Ecopack2



LQFP 144 20x20x1.4 mm

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LQFP 144 20x20x1.4 mm





(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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