Ultra-low-power with FPU ARM Cortex-M4 MCU 80 MHz with 1 Mbyte Flash, USB OTG, LCD, AES-256, DFSDM

The STM32L4A6xG 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 STM32L4A6xG devices embed high-speed memories (1 Mbyte of Flash memory, 320 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 STM32L4A6xG 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 STM32L4A6xG devices embed AES and HASH hardware accelerator.

The STM32L4A6xG operates in the -40 to +85 °C (+105 °C junction), -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. 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 STM32L4A6xG family offers six packages from 64-pin to 169-pin packages.

Key Features

  • Ultra-low-power with FlexPowerControl
    • 1.71 V to 3.6 V power supply
    • -40 °C to 85/125 °C temperature range
    • 320 nA in VBAT mode: supply for RTC and 32x32-bit backup registers
    • 25 nA Shutdown mode (5 wakeup pins)
    • 108 nA Standby mode (5 wakeup pins)
    • 426 nA Standby mode with RTC
    • 2.57 μA Stop 2 mode, 2.86 μA Stop 2 with RTC
    • 91 μA/MHz run mode (LDO Mode)
    • 37 μA/MHz run mode (@3.3 V SMPS Mode)
    • Batch acquisition mode (BAM)
    • 5 μs wakeup from Stop mode
    • Brown out reset (BOR) in all modes except shutdown
    • 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, 100 DMIPS and DSP instructions
  • Performance benchmark
    • 1.25 DMIPS/MHz (Drystone 2.1)
    • 273.55 Coremark® (3.42 Coremark/MHz @ 80 MHz)
  • Energy benchmark
    • 217 ULPBENCH™ score
  • 16 x timers: 2 x 16-bit advanced motor-control, 2 x 32-bit and 5 x 16-bit general purpose, 2 x 16-bit basic, 2 x low-power 16-bit timers (available in Stop mode), 2 x watchdogs, SysTick timer
  • RTC with HW calendar, alarms and calibration
  • Up to 136 fast I/Os, most 5 V-tolerant, up to 14 I/Os with independent supply down to 1.08 V
  • Dedicated Chrom-ART Accelerator™ for enhanced graphic content creation (DMA2D)
  • 8- to 14-bit camera interface up to 32 MHz (black&white) or 10 MHz (color)
  • Encryption hardware accelerator: AES (128/256-bit key), HASH (SHA-256)
  • Memories
    • 1 MB Flash, 2 banks read-while-write, proprietary code readout protection
    • 320 KB of SRAM including 64 KB with hardware parity check
    • External memory interface for static memories supporting SRAM, PSRAM, NOR and NAND memories
    • Dual-flash Quad SPI memory interface
  • 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)
    • Internal 48 MHz with clock recovery
    • 3 PLLs for system clock, USB, audio, ADC
  • LCD 8 × 40 or 4 × 44 with step-up converter
  • Up to 24 capacitive sensing channels: support touchkey, linear and rotary touch sensors
  • 4 x 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
    • 2 x 12-bit DAC, low-power sample and hold
    • 2 x operational amplifiers with built-in PGA
    • 2 x ultra-low-power comparators
  • 20 x communication interfaces
    • USB OTG 2.0 full-speed, LPM and BCD
    • 2 x SAIs (serial audio interface)
    • 4 x I2C FM+(1 Mbit/s), SMBus/PMBus
    • 5 x U(S)ARTs (ISO 7816, LIN, IrDA, modem)
    • 1 x LPUART
    • 3 x SPIs (4 x SPIs with the Quad SPI)
    • 2 x CAN (2.0B Active) and SDMMC
    • 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

Resources

Technical Documentation

Product Specifications
Description Version Size
Ultra-low-power ARM® Cortex®-M4 32-bit MCU+FPU, 100DMIPS, 1MB Flash, 320KB SRAM, USB OTG FS, audio, AES+HASH, ext. SMPS 2.0 3 MB
Application Notes
Description Version Size
ADC hardware oversampling for microcontrollers of the STM32 L0 and L4 series 1.0 321 KB
Analog-to-digital audio conversion example using STM32L4 Series microcontroller peripherals 1.0 1 MB
Audio and waveform generation using the DAC in STM32 microcontrollers 3.0 816 KB
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
Digital camera interface (DCMI) on STM32 MCUs 1.0 2 MB
EEPROM emulation techniques and software for STM32L4 Series microcontrollers 1.0 461 KB
EMC design guide for ST microcontrollers 2.0 843 KB
ESD considerations for touch sensing applications on MCUs 2.0 353 KB
Electrostatic discharge sensitivity measurement 1.6 49 KB
Extending the DAC performance of STM32 microcontrollers 2.0 365 KB
General-purpose timer cookbook 2.0 1 MB
Getting started with STM32L4 Series and STM32L4+ Series hardware development 5.0 794 KB
Guidelines for designing touch sensing applications with surface sensors 3.0 1 MB
Guidelines to improve conducted noise robustness on STM32F0/F3, STM32L0/L4 series touch sensing applications 3.0 613 KB
Guidelines to increase the number of touch sensing touchkeys 4.0 300 KB
Handling of soft errors in STM32 applications 2.1 410 KB
High-speed SI simulations using IBIS and board-level simulations using HyperLynx SI on STM32 32-bit ARM® Cortex® MCUs 1.1 2 MB
How to get the best ADC accuracy in STM32 microcontrollers 3.1 1 MB
How to implement a vocoder solution using STM32 microcontrollers 1.1 466 KB
How to wake up an STM32F0/F3/L0/L4 microcontroller from low-power mode with the USART or the LPUART 1.0 317 KB
I2C protocol used in the STM32 bootloader 5.0 682 KB
Implications of memory interface configurations on low-power STM32 microcontrollers 2.0 435 KB
Managing memory protection unit (MPU) in STM32 MCUs 1.0 284 KB
Migrating between STM32L0 Series and STM32L4 Series / STM32L4+ Series microcontrollers 4.0 1 MB
Migrating between STM32L476xx/486xx and STM32L496xx/4A6xx microcontrollers 3.0 859 KB
Migrating from STM32F1 Series to STM32L4 Series / STM32L4+ Series microntrollers 5.0 1 MB
Migrating from STM32F2x5 line to STM32L4 Series and STM32L4+ Series microcontrollers 3.0 1 MB
Migrating from STM32F303 line to STM32L4 Series and STM32L4+ Series microcontrollers 3.0 902 KB
Migrating from STM32F401 and STM32F411 lines to STM32L4 Series and STM32L4+ Series microcontrollers 5.0 1 MB
Migrating from STM32F405/415 line and STM32F407/417 line to STM32L4 Series and STM32L4+ Series microcontrollers 3.0 1 MB
Migrating from STM32L1 Series to STM32L4 Series and STM32L4+ Series microcontrollers 5.0 1 MB
Minimization of power consumption using LPUART in microcontrollers of the STM32L0 and STM32L4 series 3.2 1 MB
Optimizing power and performance with STM32L4 Series microcontrollers 2.0 725 KB
Oscillator design guide for STM8AF/AL/S and STM32 microcontrollers 11.0 2 MB
Quad-SPI (QSPI) interface on STM32 microcontrollers 1.0 2 MB
SPI protocol used in the STM32 bootloader 4.0 551 KB
STM32 USART automatic baud rate detection 1.0 268 KB
STM32 cross-series timer overview 6.0 555 KB
STM32 microcontroller debug toolbox 2.0 5 MB
STM32 microcontroller system memory boot mode 31.0 3 MB
STM32 microcontrollers random number generation validation using NIST statistical test suite 2.0 517 KB
STM32Cube firmware examples for STM32L4 Series and STM32L4+ Series 11.0 493 KB
STM32L0/L4 FIREWALL overview 1.2 114 KB
STM32L4 ultra-low-power features overview 3.0 458 KB
Sampling capacitor selection guide for MCU based touch sensing applications 3.0 208 KB
Tuning a STMTouch-based application 3.0 783 KB
USART protocol used in the STM32 bootloader 7.0 617 KB
Using STM32 device PWM shut-down features for motor control and digital power conversion 4.0 834 KB
Using an electromyogram technique to detect muscle activity 1.0 634 KB
Using the Chrom-ART Accelerator™ to refresh an LCD-TFT display on STM32L496xx/L4A6xx/L4Rxxx/L4Sxxx microcontrollers 1.0 408 KB
Using the hardware real-time clock (RTC) in low-power modes with STM32 microcontrollers 3.0 1 MB
Virtually increasing the number of serial communication peripherals in STM32 applications 1.1 338 KB
Technical Notes & Articles
Description Version Size
Description of WLCSP for microcontrollers and recommendations for its use 4.0 1 MB
How to use EWARM 6.2x with projects built with EWARM 6.1 and previous versions 1.2 97 KB
Tape and reel shipping media for STM32 microcontrollers in BGA packages 2.1 745 KB
Tape and reel shipping media for STM8 and STM32 microcontrollers in FPN packages 3.0 753 KB
Tape and reel shipping media for STM8 and STM32 microcontrollers in QFP packages 3.0 830 KB
Tape and reel shipping media for STM8 and STM32 microcontrollers in SO packages 1.0 755 KB
Tape and reel shipping media for STM8 and STM32 microcontrollers in TSSOP and SSOP packages 1.0 743 KB
Reference Manuals
Description Version Size
STM32L4x5 and STM32L4x6 advanced ARM®-based 32-bit MCUs 5.0 20 MB
Programming Manuals
Description Version Size
STM32F3 Series, STM32F4 Series, STM32L4 Series and STM32L4+ Series Cortex®-M4 programming manual 6.0 3 MB
Errata Sheets
Description Version Size
STM32L496xx and STM32L4A6xx device limitations 5.0 463 KB
Device Option Lists
Description Version Size
STM32L4A6 Option List 9 KB
STM32L4A6 SMPS Option List 2 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 1.4 2 MB
STM32L4 IBIS models 2.3 23 MB
STM32L4 System View Description 1.2 448 KB

Presentations & Training Material

Presentations
Description Version Size
STM32L4 MCU series - Excellence in ultra-low-power with performance 4.0 1 MB
STM32L4+ MCU series - Excellence in ultra-low-power with more performance 1.0 1 MB

Publications and Collaterals

Flyers
Description Version Size
Get ready for the largest IoT development ecosystem 17.02 741 KB
STM32 GUI solutions - Avanced HMI now achievable on embedded systems 17.12 1 MB
STM32 Nucleo boards - Unified scalable offering 17.11 1 MB
STM32 for makers - Releasing your creativity 17.06 2 MB
STM32L4 Series - Ultra-low-power and performance 17.07 770 KB
Brochures
Description Version Size
STM32 32-bit MCU family - Leading supplier of ARM® Cortex®-M microcontrollers 17.10 2 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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Sample & Buy

Part Number Package Packing Type Operating Temperature (°C) (min) Operating Temperature (°C) (max) Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
STM32L4A6VGY6TR WLCSP 100L PITCH 0.4 DIE 461 Tape And Reel -40 85 Active 5.364 10000 5A002A1A 5A992C TAIWAN MORE INFO No availability reported, please contact our Sales office
STM32L4A6VGT6 LQFP 100 14x14x1.4 Tray -40 85 Active 5.943 10000 5A002A1A 5A992C PHILIPPINES MORE INFO DISTRIBUTOR AVAILABILITY
STM32L4A6VGY6PTR WLCSP 100L PITCH 0.4 DIE 461 Tape And Reel -40 85 Active 5.364 10000 5A002A1A 5A992C TAIWAN MORE INFO No availability reported, please contact our Sales office
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STM32L4A6VGY6TR ActiveWLCSP 100L PITCH 0.4 DIE 461IndustrialEcopack2 0 0
STM32L4A6VGT6 ActiveLQFP 100 14x14x1.4IndustrialEcopack2 0 0
STM32L4A6VGY6PTR ActiveWLCSP 100L PITCH 0.4 DIE 461IndustrialEcopack2 0 0
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(**) 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.

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