STMicroelectronics STM32L476RGT6U

Overview

STM32L476RGT6U from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 1 MB flash, 128 KB SRAM, USB OTG FS, integrated LCD controller, and external SMPS support. It targets battery-powered IoT edge nodes, portable medical devices, and energy-harvesting sensor hubs requiring sub-µA standby and fast wake-up.

For engineers reviewing the STM32L476RGT6U datasheet, STM32L476RGT6U pinout, STM32L476RGT6U application, or STM32L476RGT6U equivalent, key selection criteria include its 39 µA/MHz SMPS-run efficiency, 420 nA RTC-enabled Standby mode, 114 GPIOs (most 5 V-tolerant), and dual 12-bit DAC + 2 op-amps for analog signal conditioning in compact embedded systems.

Technical Context

The device 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 modes (VOS0–VOS2) and support for external SMPS to reduce active current by >60% versus LDO-only operation. Its interconnect matrix decouples bus arbitration across CPU, DMA, and peripherals for deterministic real-time response.

It implements a dual-bank flash memory with read-while-write capability and hardware code readout protection (RDP Level 2), paired with 32 KB of SRAM protected by hardware parity. The analog subsystem includes three independent 12-bit ADCs (5 Msps total), two 12-bit DACs with sample-and-hold, two rail-to-rail op-amps with programmable gain, and two ultra-low-power comparators-all supplied from a dedicated VDDA domain.

Key Specifications

Pinout & Package

LQFP64 package: 10 × 10 mm body, 0.5 mm pitch, exposed thermal pad (EP), RoHS-compliant and ECOPACK2-certified. Pin count and mechanical footprint align with JEDEC MO-115AB standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L432KCU6, the STM32L476RGT6U delivers 4× more flash, integrated LCD driving, and SMPS support for extended battery life - but in a larger LQFP64 package. Versus STM32L562RET6, it trades hardware security for lower power and lower cost, making it optimal for non-security-critical, energy-constrained edge nodes.

Availability

STM32L476RGT6U is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic devices requiring stable component supply across multi-year production cycles.

Supply support for STM32L476RGT6U 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, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance per µA, with design focus on battery longevity, rich analog integration, and robust real-time operation in harsh environments.

FAQ

What is the maximum operating frequency and corresponding performance metric?

The STM32L476RGT6U operates at up to 80 MHz, delivering 100 DMIPS (Dhrystone 2.1) and 273.55 CoreMark® (3.42 CoreMark/MHz). This performance is sustained with zero wait states using the ART Accelerator™, which caches flash accesses to eliminate instruction fetch bottlenecks.

Does this MCU support external memory expansion, and if so, what interfaces are available?

Yes - it supports external static memories via the Flexible Static Memory Controller (FSMC), compatible with SRAM, PSRAM, NOR, and NAND devices. Additionally, the Quad SPI (QUADSPI) interface enables high-speed connection to serial flash or RAM, supporting memory-mapped execution for code offloading.

How does the power architecture differ between LDO and SMPS operation modes?

In LDO mode, the internal regulator supplies VDD from VDDA, drawing 100 µA/MHz. In SMPS mode, an external DC-DC converter supplies VDD12 (1.1 V), reducing core current to 39 µA/MHz - a 61% improvement. Voltage scaling must be configured via PWR_CR1 register, and SMPS enable requires proper external circuitry per AN4865.

Can the integrated LCD controller drive common LCD types without external components?

Yes - the built-in LCD controller supports 8×40 or 4×44 segment displays and includes an internal step-up converter generating VLCD from VDD, eliminating need for external charge pump or bias generator. Contrast is adjustable via software-controlled voltage divider, and COM/SEG outputs are directly routed to display pins.