STMicroelectronics STM32L476ZET6

Overview

STM32L476ZET6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 512 KB flash, 128 KB SRAM, USB OTG FS, LCD controller, and integrated SMPS support. It delivers 39 µA/MHz run current in SMPS mode and supports -40 °C to 105 °C operation - deployed in battery-powered medical sensors and portable industrial HMI displays.

For engineers reviewing the STM32L476ZET6 datasheet, STM32L476ZET6 pinout, STM32L476ZET6 application, or STM32L476ZET6 equivalent, key selection criteria include its dual-voltage I/O (1.08–3.6 V), 114 GPIOs (most 5 V-tolerant), RTC with hardware calendar, and low-power timer availability in Stop 2 mode.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz, alongside a memory protection unit (MPU) and interconnect matrix for deterministic peripheral arbitration. Its power architecture includes three voltage scaling modes (VOS0–VOS2), external SMPS interface, and five low-power modes - Shutdown (30 nA), Standby (120 nA), and Stop 2 (1.1 µA with RTC).

Clock system comprises four independent sources: 4–48 MHz HSE, 32 kHz LSE for RTC, 16 MHz HSI (±1%), and auto-trimmed MSI (±0.25%). Three PLLs generate system, USB, and audio clocks; DFSDM enables sigma-delta sensor interfacing with hardware filtering.

Key Specifications

Pinout & Package

LQFP144 (20 × 20 mm, 0.5 mm pitch) package with exposed thermal pad; 144-pin quad flat pack suitable for automated optical inspection and reflow assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L476ZET6, STM32L475VGT6 trades LCD capability for double flash capacity, while STM32L552ZET6 adds TrustZone security and higher clock speed at the cost of increased design complexity and toolchain requirements.

Availability

STM32L476ZET6 is available at Aetrix Electronics and suitable for wearable health monitors, smart building sensor nodes, industrial HMI displays, and portable diagnostic tools requiring stable component supply across multi-year production cycles.

Supply support for STM32L476ZET6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, power management ICs, MEMS, and analog chips for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance per µA, with emphasis on battery longevity, rich analog integration, and seamless migration from legacy Cortex-M3 platforms.

FAQ

What is the maximum operating frequency and corresponding power supply configuration?

The STM32L476ZET6 operates at up to 80 MHz when powered by VDD = 3.3 V with VOS0 voltage scaling and ART Accelerator enabled. At this frequency, it achieves 100 DMIPS and consumes 39 µA/MHz in SMPS mode or 100 µA/MHz in LDO mode. The core requires VDD ≥ 2.4 V for 80 MHz operation; lower frequencies allow down to 1.71 V.

Does STM32L476ZET6 support external memory expansion?

Yes - it integrates a Flexible Static Memory Controller (FSMC) supporting SRAM, PSRAM, NOR, and NAND memories with address/data multiplexing. The FSMC provides up to 16-bit data bus, programmable timing, and wait-state insertion. It does not support DDR or SDRAM; for higher bandwidth, Quad SPI (QSPI) interface is available for external flash/XIP execution.

How many independent power domains does the chip support for mixed-voltage I/O?

The STM32L476ZET6 supports three independent I/O voltage domains: VDD (1.71–3.6 V), VDDIO2 (1.08–3.6 V for up to 14 pins), and VDDA (1.62–3.6 V for analog). This allows direct interfacing with 1.2 V logic, 1.8 V sensors, and 3.3 V peripherals without level shifters - critical for energy-constrained IoT endpoints.

Is the LCD controller capable of driving segment-based displays without external components?

Yes - the integrated LCD controller supports 8×40 or 4×44 static/dynamic segment drives with an on-chip step-up converter delivering up to 5.3 V from 3.3 V supply. It requires only external R/C network for bias generation and no external boost IC, enabling compact monochrome display designs in space-constrained wearables.