STMicroelectronics STM32L476ZGT3

Overview

STM32L476ZGT3 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 80 MHz max frequency, 1 MB flash, 128 KB SRAM, USB OTG FS, LCD controller, and integrated SMPS support. It delivers 100 DMIPS and operates from 1.71–3.6 V across -40 °C to 105 °C, targeting battery-powered IoT edge nodes with display and sensor fusion.

For engineers reviewing the STM32L476ZGT3 datasheet, STM32L476ZGT3 pinout, STM32L476ZGT3 application, or STM32L476ZGT3 equivalent, key selection criteria include its 39 µA/MHz SMPS-enabled run mode, 420 nA standby-with-RTC current, dual 12-bit DACs, 3× 12-bit ADCs (5 Msps), and LQFP144 package compatibility for industrial HMI and portable medical devices.

Technical Context

This MCU integrates an Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz, alongside a flexible power architecture with three voltage scaling ranges and batch acquisition mode (BAM) for sensor data bursts. Its interconnect matrix decouples bus masters to sustain concurrent peripheral activity without arbitration stalls.

The device supports dual-supply I/Os (up to 14 pins at 1.08 V), hardware parity on 32 KB SRAM, and independent analog supply domains for ADC/DAC/OPAMP/COMP - all synchronized via a multi-source clock system featuring three PLLs, auto-trimmed MSI, and RTC-calibrated LSE.

Key Specifications

Pinout & Package

LQFP144 package (20 × 20 mm, 0.5 mm pitch), 144-pin quad flat pack with exposed thermal pad; RoHS-compliant and ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L476ZGT3, the VGT6 offers identical functionality in smaller footprint but sacrifices 32 I/Os and LCD segment capacity, while the L562ZEJ6Q adds security and performance at higher power and cost - making the ZGT3 optimal for cost-sensitive, display-rich, battery-operated industrial edge devices.

Availability

STM32L476ZGT3 is available at Aetrix Electronics and suitable for smart utility meters, portable medical monitors, industrial HMI panels, and wireless sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for STM32L476ZGT3 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, specializing in microcontrollers, power management, sensors, and automotive ICs with strong focus on energy efficiency and industrial reliability.

The STM32L4 series targets ultra-low-power embedded applications demanding high integration, long battery life, and rich analog/mixed-signal capability - especially in metering, wearables, and industrial IoT endpoints.

FAQ

What is the maximum operating frequency and corresponding power supply configuration for STM32L476ZGT3?

The STM32L476ZGT3 achieves 80 MHz maximum CPU frequency using the HSI16 or HSE clock source with the main PLL. This requires VDD ≥ 2.4 V and voltage scaling range 1 (VOS1); at lower voltages (e.g., 1.8 V), max frequency drops to 26 MHz in VOS3 mode per datasheet Table 23.

Does STM32L476ZGT3 support external memory interfaces, and which types are compatible?

Yes - it integrates a Flexible Static Memory Controller (FSMC) supporting SRAM, PSRAM, NOR Flash, and NAND Flash with ECC. The QUADSPI interface provides high-speed serial flash access. Both controllers operate independently and support memory-mapped execution, enabling code overlay or large data buffers without SRAM pressure.

How does the Batch Acquisition Mode (BAM) reduce power during sensor data collection?

BAM allows the CPU to remain in low-power sleep while peripherals (ADC, DFSDM, timers) autonomously acquire and process sensor data into memory via DMA. Only after a programmable batch size is reached does the CPU wake - cutting active time by >90% in periodic sensing applications like environmental monitoring.

Can the integrated LCD controller drive both segment-based and dot-matrix displays?

The LCD controller supports only static and multiplexed segment-based displays (up to 8×40 or 4×44), not dot-matrix or graphic LCDs. It includes built-in step-up converter for VLCD generation and software-controlled contrast adjustment, eliminating need for external bias generators in segment LCD applications.