Ultra-low-power with FPU ARM Cortex-M4 MCU 80 MHz with 512 Kbytes Flash, LCD, USB OTG, DFSDM

The STM32L476xx devices are the ultra-low-power microcontrollers based on the high-performance ARM® Cortex®-M4 32-bit RISC core operating at a frequency of up to 80 MHz. The Cortex-M4 core features a Floating point unit (FPU) single precision which supports all ARM single-precision data-processing instructions and data types. It also implements a full set of DSP instructions and a memory protection unit (MPU) which enhances application security.

The STM32L476xx devices embed high-speed memories (Flash memory up to 1 Mbyte, up to 128 Kbyte of SRAM), a flexible external memory controller (FSMC) for static memories (for devices with packages of 100 pins and more), a Quad 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 STM32L476xx devices embed several protection mechanisms for embedded Flash memory and SRAM: readout protection, write protection, proprietary code readout protection and Firewall.

The devices offer up to three fast 12-bit ADCs (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 24 capacitive sensing channels are available. The devices also embed an integrated LCD driver 8x40 or 4x44, with internal step-up converter.

They also feature standard and advanced communication interfaces.

The STM32L476xx operates in the -40 to +85 °C (+105 °C junction), -40 to +105 °C (+125 °C junction) and -40 to +125 °C (+130 °C junction) temperature ranges from a 1.71 to 3.6 V VDD power supply when using internal LDO regulator and a 1.05 to 1.32V VDD12 power supply when using external SMPS supply. A comprehensive set of power-saving modes allows the design of low-power applications.

Some independent power supplies are supported: analog independent supply input for ADC, DAC, OPAMPs and comparators, 3.3 V dedicated supply input for USB and up to 14 I/Os can be supplied independently down to 1.08V. A VBAT input allows to backup the RTC and backup registers. Dedicated VDD12 power supplies can be used to bypass the internal LDO regulator when connected to an external SMPS.

The STM32L476xx family offers six packages from 64-pin to 144-pin packages.

Key Features

  • Ultra-low-power with FlexPowerControl
    • 1.71 V to 3.6 V power supply
    • -40 °C to 85/105/125 °C temperature range
    • 300 nA in VBAT mode: supply for RTC and 32x32-bit backup registers
    • 30 nA Shutdown mode (5 wakeup pins)
    • 120 nA Standby mode (5 wakeup pins)
    • 420 nA Standby mode with RTC
    • 1.1 μA Stop 2 mode, 1.4 μA with RTC
    • 100 μA/MHz run mode (LDO Mode)
    • 39 μA/MHz run mode (@3.3 V SMPS Mode)
    • Batch acquisition mode (BAM)
    • 4 μs wakeup from Stop mode
    • Brown out reset (BOR)
    • Interconnect matrix
  • Core: ARM® 32-bit Cortex®-M4 CPU with FPU, Adaptive real-time accelerator (ART Accelerator™) allowing 0-wait-state execution from Flash memory, frequency up to 80 MHz, MPU, 100DMIPS and DSP instructions
  • Performance benchmark
    • 1.25 DMIPS/MHz (Drystone 2.1)
    • 273.55 CoreMark® (3.42 CoreMark/MHz @ 80 MHz)
  • Energy benchmark
    • 220 ULPBENCH® score
  • Clock Sources
    • 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)
    • 3 PLLs for system clock, USB, audio, ADC
  • Up to 114 fast I/Os, most 5 V-tolerant, up to 14 I/Os with independent supply down to 1.08 V
  • RTC with HW calendar, alarms and calibration
  • LCD 8× 40 or 4× 44 with step-up converter
  • Up to 24 capacitive sensing channels: support touchkey, linear and rotary touch sensors
  • 16x timers: 2x 16-bit advanced motor-control, 2x 32-bit and 5x 16-bit general purpose, 2x 16-bit basic, 2x low-power 16-bit timers (available in Stop mode), 2x watchdogs, SysTick timer
  • Memories
    • Up to 1 MB Flash, 2 banks read-while-write, proprietary code readout protection
    • Up to 128 KB of SRAM including 32 KB with hardware parity check
    • External memory interface for static memories supporting SRAM, PSRAM, NOR and NAND memories
    • Quad SPI memory interface
  • 4x digital filters for sigma delta modulator
  • 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
    • 2x ultra-low-power comparators
  • 20x communication interfaces
    • USB OTG 2.0 full-speed, LPM and BCD
    • 2x SAIs (serial audio interface)
    • 3x I2C FM+(1 Mbit/s), SMBus/PMBus
    • 5x USARTs (ISO 7816, LIN, IrDA, modem)
    • 1x LPUART (Stop 2 wake-up)
    • 3x SPIs (4x SPIs with the Quad SPI)
    • CAN (2.0B Active) and SDMMC interface
    • SWPMI single wire protocol master I/F
    • IRTIM (Infrared interface)
  • 14-channel DMA controller
  • True random number generator
  • CRC calculation unit, 96-bit unique ID
  • Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™

Circuit Diagram



Technical Documentation

Product Specifications
Description Version Size
DS10198 DS10198: Ultra-low-power ARM® Cortex®-M4 32-bit MCU+FPU, 100DMIPS, up to 1MB Flash, 128 KB SRAM, USB OTG FS, LCD, ext. SMPS 5.0 3 MB
Application Notes
Description Version Size
AN4629 AN4629: ADC hardware oversampling for microcontrollers of the STM32 L0 and L4 series 1.0 321 KB
AN5012 AN5012: Analog-to-digital audio conversion example using STM32L4 Series microcontroller peripherals 1.0 1 MB
AN3126 AN3126: Audio and waveform generation using the DAC in STM32 microcontrollers 3.0 816 KB
AN4775 AN4775: Basics and low-cost solution proposals to move from legacy USB2.0 connector to USB Type-C™ connector with STM32 devices 1.0 443 KB
AN3154 AN3154: CAN protocol used in the STM32 bootloader 6.0 630 KB
AN5020 AN5020: Digital camera interface (DCMI) on STM32 MCUs 1.0 2 MB
AN4894 AN4894: EEPROM emulation techniques and software for STM32L4 Series microcontrollers 1.0 461 KB
AN1709 AN1709: EMC design guide for ST microcontrollers 2.0 843 KB
AN3960 AN3960: ESD considerations for touch sensing applications on MCUs 2.0 353 KB
AN1181 AN1181: Electrostatic discharge sensitivity measurement 1.6 49 KB
AN4566 AN4566: Extending the DAC performance of STM32 microcontrollers 2.0 365 KB
AN4776 AN4776: General-purpose timer cookbook 2.0 1 MB
AN4555 AN4555: Getting started with STM32L4 Series hardware development 4.0 727 KB
AN4312 AN4312: Guidelines for designing touch sensing applications with surface sensors 3.0 1 MB
AN4299 AN4299: Guidelines to improve conducted noise robustness on STM32F0/F3, STM32L0/L4 series touch sensing applications 3.0 613 KB
AN3236 AN3236: Guidelines to increase the number of touch sensing touchkeys 4.0 300 KB
AN4750 AN4750: Handling of soft errors in STM32 applications 2.1 410 KB
AN4803 AN4803: High-speed SI simulations using IBIS and board-level simulations using HyperLynx SI on STM32 32-bit ARM® Cortex® MCUs 1.1 2 MB
AN2834 AN2834: How to get the best ADC accuracy in STM32 microcontrollers 3.1 1 MB
AN4229 AN4229: How to implement a vocoder solution using STM32 microcontrollers 1.1 466 KB
AN4991 AN4991: How to wake up an STM32F0/F3/L0/L4 microcontroller from low-power mode with the USART or the LPUART 1.0 317 KB
AN4221 AN4221: I2C protocol used in the STM32 bootloader 5.0 682 KB
AN4777 AN4777: Implications of memory interface configurations on low-power STM32 microcontrollers 2.0 435 KB
AN4838 AN4838: Managing memory protection unit (MPU) in STM32 MCUs 1.0 284 KB
AN4809 AN4809: Migrating between STM32L0 Series and STM32L4 Series microcontrollers 2.0 786 KB
AN4822 AN4822: Migrating between STM32L476xx/486xx and STM32L496xx/4A6xx microcontrollers 3.0 859 KB
AN4754 AN4754: Migrating between STM32L486xx/476xx and STM32L443xx/433xx microcontrollers 1.0 518 KB
AN4649 AN4649: Migrating from STM32F1 Series to STM32L4 Series microcontrollers 4.0 1 MB
AN4831 AN4831: Migrating from STM32F2x5 line to STM32L4 Series microcontrollers 2.0 870 KB
AN4832 AN4832: Migrating from STM32F303 line to STM32L4 Series microcontrollers 2.0 761 KB
AN4616 AN4616: Migrating from STM32F401 and STM32F411 lines to STM32L4 Series microcontrollers 4.0 1 MB
AN4821 AN4821: Migrating from STM32F405/415 line and STM32F407/417 line to STM32L4 Series microcontrollers 2.0 1 MB
AN4612 AN4612: Migrating from STM32L1 Series to STM32L4 Series microcontrollers 4.0 1 MB
AN4635 AN4635: Minimization of power consumption using LPUART in microcontrollers of the STM32L0 and STM32L4 series 3.2 1 MB
AN4746 AN4746: Optimizing power and performance with STM32L4 Series microcontrollers 2.0 725 KB
AN2867 AN2867: Oscillator design guide for STM8AF/AL/S and STM32 microcontrollers 11.0 2 MB
AN4760 AN4760: Quad-SPI (QSPI) interface on STM32 microcontrollers 1.0 2 MB
AN4286 AN4286: SPI protocol used in the STM32 bootloader 4.0 551 KB
AN4908 AN4908: STM32 USART automatic baud rate detection 1.0 268 KB
AN4013 AN4013: STM32 cross-series timer overview 6.0 555 KB
AN4989 AN4989: STM32 microcontroller debug toolbox 2.0 5 MB
AN2606 AN2606: STM32 microcontroller system memory boot mode 31.0 3 MB
AN4230 AN4230: STM32 microcontrollers random number generation validation using NIST statistical test suite 2.0 517 KB
AN4726 AN4726: STM32Cube firmware examples for STM32L4 Series and STM32L4+ Series 10.0 499 KB
AN4729 AN4729: STM32L0/L4 FIREWALL overview 1.2 114 KB
AN4621 AN4621: STM32L4 ultra-low-power features overview 3.0 458 KB
AN4310 AN4310: Sampling capacitor selection guide for MCU based touch sensing applications 3.0 208 KB
AN4316 AN4316: Tuning a STMTouch-based application 3.0 783 KB
AN3155 AN3155: USART protocol used in the STM32 bootloader 7.0 617 KB
AN3156 AN3156: USB DFU protocol used in the STM32 bootloader 6.0 373 KB
AN4277 AN4277: Using STM32 device PWM shut-down features for motor control and digital power conversion 4.0 834 KB
AN4995 AN4995: Using an electromyogram technique to detect muscle activity 1.0 634 KB
AN4759 AN4759: Using the hardware real-time clock (RTC) in low-power modes with STM32 microcontrollers 3.0 1 MB
AN4655 AN4655: Virtually increasing the number of serial communication peripherals in STM32 applications 1.1 338 KB
Technical Notes & Articles
Description Version Size
TN1163 TN1163: Description of WLCSP for microcontrollers and recommendations for its use 4.0 1 MB
TN0830 TN0830: How to use EWARM 6.2x with projects built with EWARM 6.1 and previous versions 1.2 97 KB
TN1204 TN1204: Tape and reel shipping media for STM32 microcontrollers in BGA packages 2.1 745 KB
TN1205 TN1205: Tape and reel shipping media for STM8 and STM32 microcontrollers in FPN packages 3.0 753 KB
TN1206 TN1206: Tape and reel shipping media for STM8 and STM32 microcontrollers in QFP packages 3.0 830 KB
TN1207 TN1207: Tape and reel shipping media for STM8 and STM32 microcontrollers in SO packages 1.0 755 KB
TN1208 TN1208: Tape and reel shipping media for STM8 and STM32 microcontrollers in TSSOP and SSOP packages 1.0 743 KB
Reference Manuals
Description Version Size
RM0351 RM0351: STM32L4x5 and STM32L4x6 advanced ARM®-based 32-bit MCUs 5.0 20 MB
Programming Manuals
Description Version Size
PM0214 PM0214: STM32F3, STM32F4 and STM32L4 Series Cortex®-M4 programming manual 5.0 3 MB
Errata Sheets
Description Version Size
ES0250 ES0250: STM32L476xx/STM32L486xx device limitations 5.0 779 KB

HW Model, CAD Libraries & SVD

HW Model, CAD Libraries & SVD
Description Version Size
STM32L4 Boundary Scan Description Language (BSDL) files 3.1 186 KB
STM32L4 CAD Symbol and Footprint files 1.3 2 MB
STM32L4 IBIS models 2.3 23 MB
STM32L4 System View Description 1.1 424 KB

Presentations & Training Material

Description Version Size
STM32L4 MCU series - Excellence in ultra-low-power with performance 4.0 1 MB

Publications and Collaterals

Description Version Size
Get ready for the largest IoT development ecosystem 17.02 741 KB
STM32 GUI solutions - Advanced HMI now achievable on embedded systems 1.0 1 MB
STM32 Nucleo boards 17.07 1 MB
STM32 for makers Releasing your creativity 16.2 2 MB
STM32L4 Series - Ultra-low-power and performance 17.07 770 KB
Description Version Size
STM32™ 32-bit MCU family - Leading supplier of ARM® Cortex®-M microcontrollers 18.0 1 MB
STM32L series - Ultra-low-power 32-bit MCUs 16.4 3 MB
Magazine Articles
Description Version Size
Design & Elektronik - August 2017 1.1 1 MB
Design & Elektronik magazine - Benchmark ULPBench debunked 1.1 12 MB

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