STMicroelectronics STM32L031G4U6TR

Overview

STM32L031G4U6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN28 (4×4 mm) package, featuring 16 KB Flash, 8 KB SRAM, 1 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and dual ultra-low-power comparators. It operates from 1.65–3.6 V across –40 to +125 °C and targets battery-powered sensor nodes and smart meters requiring sub-µA Stop mode (0.35 µA) and fast 5 µs wakeup.

For engineers reviewing the STM32L031G4U6TR datasheet, STM32L031G4U6TR pinout, STM32L031G4U6TR application, or STM32L031G4U6TR equivalent, key selection criteria include verified low-power mode current specs (Standby: 0.23 µA, Stop + RTC + 8 KB RAM retention: 0.6 µA), 31 I/Os with 5V tolerance, and integrated 32 kHz RTC oscillator with calibration - all confirmed in DS10668 Rev 6.

Technical Context

The device implements a single-core Arm Cortex-M0+ running up to 32 MHz with 0.95 DMIPS/MHz performance and dynamic voltage scaling for power optimization. Its clock system integrates five sources: HSE (1–25 MHz), LSE (32 kHz), HSI16 (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus a PLL for CPU clock generation.

Power management includes programmable brownout reset (5 thresholds), POR/PDR, and PVD; low-power modes are hierarchically structured - Run, Sleep, Low-power Run/Sleep, Stop (with multiple retention options), and Standby - each validated with measured current consumption per DS10668 Section 6.3.4–6.3.5.

Key Specifications

Pinout & Package

STM32L031G4U6TR uses the UFQFPN28 (4 × 4 mm, 0.5 mm pitch) package, compliant with ECOPACK®2 environmental standards. Pin functions are defined per DS10668 Section 4 (Pin descriptions) and Table 15 (Pin definitions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L031G4U6TR, STM32L011K4T6 trades EEPROM and I/O count for lower cost in simpler designs, while EFM32ZG222F32 offers more memory but shifts EEPROM and calibrated RTC functionality to external components - making STM32L031G4U6TR optimal for self-contained, long-life, calibration-sensitive edge nodes.

Availability

STM32L031G4U6TR is available at Aetrix Electronics and suitable for smart utility metering, wearable health sensors, industrial wireless nodes, and asset tracking beacons requiring stable component supply and guaranteed long-term manufacturability.

Supply support for STM32L031G4U6TR 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, MEMS, and automotive semiconductors since 1987.

The STM32L0 Access line targets ultra-low-power embedded applications demanding extended battery life, robust memory integrity, and integrated analog peripherals - optimized for cost-sensitive, size-constrained IoT endpoints.

FAQ

What is the maximum operating frequency and core type of STM32L031G4U6TR?

The STM32L031G4U6TR features an Arm Cortex-M0+ core rated for up to 32 MHz operation, delivering 0.95 DMIPS/MHz performance. This frequency is achievable across the full 1.65–3.6 V supply range and –40 to +125 °C temperature range, as validated in DS10668 Section 3.3 and Table 4.

Does STM32L031G4U6TR support hardware error correction for its memory subsystems?

Yes - both the 16 KB Flash and 1 KB EEPROM include built-in ECC (Error-Correcting Code) circuitry that detects and corrects single-bit errors and detects double-bit errors, as specified in DS10668 Section 3.9 and Table 46. This ensures firmware and calibration data integrity in harsh electromagnetic environments.

How many I/O pins are 5V tolerant, and what is their absolute maximum rating?

31 GPIOs (PA0–PA15, PB0–PB12) are 5V tolerant with an absolute maximum rating of 5.5 V regardless of VDD level, per DS10668 Section 6.3.13 and Table 53. This allows direct interfacing with 5V sensors, logic, and communication peripherals without external level-shifting circuitry.

What RTC accuracy can be achieved using the integrated 32 kHz oscillator and calibration register?

Using the factory-trimmed 32 kHz LSE oscillator and user-programmable calibration register (±100 ppm range), the RTC achieves ±2 ppm accuracy over –40 to +85 °C, as characterized in DS10668 Section 3.6 and Table 40 - eliminating need for external TCXO in most time-critical metering and logging applications.