STMicroelectronics STM32L476QGI3

Overview

STM32L476QGI3 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, delivering 100 DMIPS at 80 MHz, featuring 1 MB flash, 128 KB SRAM, USB OTG FS, integrated LCD controller, and external SMPS support - deployed in battery-powered medical sensors, portable industrial HMIs, and energy-harvesting IoT nodes.

For engineers reviewing the STM32L476QGI3 datasheet, STM32L476QGI3 pinout, STM32L476QGI3 application, or STM32L476QGI3 equivalent, key selection criteria include ultra-low-power run/stop modes (39 µA/MHz in SMPS mode), dual 12-bit DACs with sample-and-hold, hardware-accelerated capacitive touch sensing (24 channels), and CAN 2.0B interface for robust fieldbus integration.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from flash at 80 MHz, alongside a memory protection unit (MPU) and interconnect matrix for deterministic peripheral arbitration. It supports three independent power domains (VDD, VDDA, VDDIO2) and dynamic voltage scaling across six performance levels.

Its clock system includes three PLLs (for CPU, USB, and audio), auto-trimmed multispeed internal oscillator (±0.25%), and dedicated low-power timer (LPTIM) operational in Stop 2 mode. The analog subsystem features two rail-to-rail op-amps with programmable gain amplifiers (PGA), two ultra-low-power comparators, and three 12-bit ADCs with hardware oversampling up to 16-bit resolution.

Key Specifications

Pinout & Package

UFBGA144 package with 144 I/O terminals in 10 × 10 mm grid, 0.8 mm ball pitch, and ECOPACK2 environmental compliance. Ball layout supports full peripheral mapping including LCD segment/common lines, capacitive touch channels, and dual ADC/DAC analog inputs/outputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L433RCT6, the STM32L476QGI3 adds LCD driving, external SMPS control, and 24-channel TSC - essential for HMI-rich edge devices. Versus STM32L562QEJ6, it trades TrustZone security for lower active power and integrated analog peripherals - optimizing for battery life and sensor fusion over cryptographic isolation.

Availability

STM32L476QGI3 is available at Aetrix Electronics and suitable for portable medical devices, smart utility meters, energy-harvesting wireless sensors, and industrial CAN edge controllers requiring stable component supply across multi-year production cycles.

Supply support for STM32L476QGI3 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 automotive semiconductors since 1987.

The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, rich analog integration, and real-time responsiveness - especially in portable healthcare, smart metering, and industrial IoT edge nodes.

FAQ

What is the maximum operating temperature range for STM32L476QGI3?

The STM32L476QGI3 is qualified for industrial operation from –40 °C to +105 °C ambient temperature. This rating is confirmed in Section 6.3.1 of DS10198 Rev 11 and applies to all UFBGA144 variants. Thermal derating begins above 105 °C, and junction temperature must remain below 125 °C under sustained load.

Does STM32L476QGI3 support hardware encryption acceleration?

No, the STM32L476QGI3 does not include dedicated cryptographic accelerators (AES, PKA, HASH). It relies on software libraries (STM32CubeL4) for encryption. For hardware-accelerated crypto, ST recommends the STM32L5 or STM32U5 series, which integrate AES-256, PKA, and TRNG with TrustZone.

Can the internal 32 kHz RC oscillator be used for RTC calibration?

Yes - the internal 32 kHz RC oscillator (±5%) can serve as RTC clock source, but its accuracy is insufficient for precise timekeeping. For calibrated RTC operation, ST specifies use of the external 32.768 kHz crystal on PC14/PC15, which enables hardware calendar, alarm, and ±1 ppm calibration via the RTC_CALIBR register per Section 3.25.

How many GPIO pins support independent VDDIO2 supply?

Up to 14 GPIO pins (grouped as PA[0–7], PB[0–7], PC[0–3]) support independent VDDIO2 supply down to 1.08 V. This capability is documented in Section 3.12 and Table 16 of DS10198 Rev 11, enabling direct interfacing with low-voltage peripherals such as 1.2 V or 1.8 V sensors and transceivers without level shifters.