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  • 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, TrustZone aware support 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 OctoSPI 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 STM32L552xx devices embed several protection mechanisms for embedded Flash memory and SRAM: readout protection, write protection, secure and hide protection areas.
    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.
    They also feature standard and advanced communication interfaces such as:
    - Four I2Cs
    - Three SPIs
    - Three USARTs, two UARTs and one low-power UART
    - Two SAIs
    - One SDMMC
    - One FDCAN
    - USB device FS
    - USB Type-C / USB power delivery controller
    - HASH (SHA-256) hardware accelerator
    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 to backup the RTC and backup the registers.
    The STM32L552xx devices offer seven packages from 48-pin to 144-pin.

    Key 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)
      • 225 nA in VBAT mode: supply for RTC and 32x32-bit backup registers
      • 33 nA Shutdown mode (5 wakeup pins)
      • 110 nA Standby mode (5 wakeup pins)
      • 385 nA Standby mode with RTC
      • 3.6 μA Stop 2 with RTC
      • 96 μA/MHz Run mode (LDO mode)
      • 60 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 Kbytes 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 @ 110 MHz
    • Energy benchmark
      • 402 ULPMark-CP® score
      • 59.5 ULPMark-PP® score
      • 27400 SecureMark-TLS® score
    • Memories
      • Up to 512 Kbytes 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
    • 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
    • Security
      • Arm® TrustZone® with the ARMv8-M mainline security extension
      • Up to 8 configurable SAU regions
      • RDP, active tamper, secure firmware upgrade support, secure hide protection
      • TrustZone aware and securable peripherals
    • Power management
      • Embedded regulator (LDO) with three configurable range output to supply the digital circuitry
      • 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 HW 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 controller
      • 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, low-power sample and hold
      • 2x operational amplifiers with built-in PGA
      • 2x ultra-low-power comparators
      • 4x digital filters for sigma delta modulator
    • True random number generator
    • CRC calculation unit
    • HASH (SHA-256) hardware accelerator
    • Debug
      • Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell (ETM)
    • 96-bit unique ID

Circuit Diagram

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Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STM32L552QCU6
Proposal
- Industrial -

STM32L552QCU6

Package:

-

Material Declaration**:

Marketing Status

Proposal

Package

-

Grade

Industrial

RoHS Compliance Grade

-

(**) The Material Declaration forms available on st.com 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.