STMicroelectronics STM32L031G6U7S

Overview

STM32L031G6U7S from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN28 (4×4 mm) package, featuring 32 KB Flash with ECC, 8 KB SRAM, 1 KB EEPROM, 12-bit ADC (1.14 Msps, 10 channels), 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.

For engineers reviewing the STM32L031G6U7S datasheet, STM32L031G6U7S pinout, STM32L031G6U7S application, or STM32L031G6U7S equivalent, key selection criteria include standby current (0.23 µA), RTC-enabled stop mode (0.6 µA with 8 KB RAM retention), 5 µs Flash wakeup time, and 31 I/Os with 5V tolerance - critical for energy-constrained industrial and metering designs.

Technical Context

The STM32L031G6U7S integrates a Cortex-M0+ core running up to 32 MHz with dynamic voltage scaling, supported by multiple clock sources: 1–25 MHz HSE, 32 kHz LSE for RTC, 16 MHz factory-trimmed HSI, and multispeed MSI (65 kHz–4.2 MHz). Its low-power architecture enables five operational modes - Run, Sleep, Low-power Run, Stop, and Standby - each with distinct power/performance trade-offs verified per DS10668 Rev 6.

Peripheral interconnect is managed via an AHB/APB matrix supporting concurrent DMA transfers to ADC, USART, SPI, I²C, and timers. The device includes a CRC calculation unit, 96-bit unique ID, and serial wire debug (SW-DP), with all packages compliant to ECOPACK®2 environmental standards.

Key Specifications

Pinout & Package

STM32L031G6U7S is housed in a 28-pin UFQFPN (4×4 mm, 0.5 mm pitch) package with exposed thermal pad. This compact, lead-free, ECOPACK®2-compliant package supports high-density PCB layouts and efficient thermal dissipation in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011K4T6, the STM32L031G6U7S offers essential EEPROM and RTC retention for field-updatable metering logic; versus STM32L051K8U6, it delivers identical low-power performance at lower cost and smaller footprint where USB is unnecessary.

Availability

STM32L031G6U7S is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, industrial asset tracking, and medical wearable monitors requiring stable component supply over extended production lifecycles.

Supply support for STM32L031G6U7S 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 products for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, robust security features, and seamless integration of analog peripherals - optimized for metering, sensing, and portable medical devices.

FAQ

What is the maximum operating frequency and core type of the STM32L031G6U7S?

The STM32L031G6U7S uses an Arm Cortex-M0+ core with a maximum CPU frequency of 32 MHz. It achieves 0.95 DMIPS/MHz and supports dynamic voltage scaling to optimize performance versus power consumption. The core includes a single-cycle multiplier and hardware divider, enabling efficient execution of control algorithms in resource-constrained environments.

Does the STM32L031G6U7S support hardware encryption or secure boot features?

No, the STM32L031G6U7S does not integrate hardware cryptographic accelerators or secure boot functionality. It lacks AES, RSA, or hash engines, and its bootloader supports only basic UART/SPI firmware updates without signature verification. For secure firmware deployment, external secure elements or software-based signing with trusted execution in SRAM are required.

Can the STM32L031G6U7S operate reliably at 125 °C ambient temperature?

Yes, the STM32L031G6U7S is fully specified for operation from –40 to +125 °C ambient temperature, validated per DS10668 Rev 6. All electrical characteristics - including Flash programming, ADC accuracy, and oscillator stability - are guaranteed across this range when used with appropriate PCB thermal design and voltage regulation.

How many I/O pins support 5V tolerance, and which ones are they?

The STM32L031G6U7S has 31 5V-tolerant I/Os, covering all GPIO pins except those dedicated to analog functions (e.g., VREF+, VREF–, VBAT) and oscillator inputs (PC14, PC15). Tolerance applies when VDD is powered (1.65–3.6 V); these pins safely interface with 5V peripherals without level shifters in mixed-voltage systems.