STMicroelectronics STM32L031G6U7

Overview

STM32L031G6U7 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, and a 12-bit ADC operating up to 1.14 Msps. It delivers 0.95 DMIPS/MHz at up to 32 MHz and supports industrial temperature range (−40 to +125 °C), making it suitable for battery-powered sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L031G6U7 datasheet, STM32L031G6U7 pinout, STM32L031G6U7 application, or STM32L031G6U7 equivalent, key selection criteria include standby current (0.23 µA), RTC-enabled stop mode (0.6 µA), 5 µs wakeup from Flash, 31 5V-tolerant I/Os, and integrated ultra-low-power comparators with wake-up capability down to 1.65 V.

Technical Context

The STM32L031G6U7 implements a dual-voltage domain architecture with programmable voltage scaling (PVS) enabling dynamic power optimization across Run, Sleep, Low-power Run, and Stop modes. Its Cortex-M0+ core integrates a single-cycle multiplier and NVIC with up to 32 interrupt channels, tightly coupled to a 32-bit AHB bus matrix supporting concurrent peripheral access.

Power management includes five selectable BOR thresholds, independent POR/PDR, and a programmable voltage detector (PVD); clock system integrates HSI16 (±1%), LSI (37 kHz), MSI (65 kHz–4.2 MHz), HSE (1–25 MHz), LSE (32.768 kHz), and PLL for CPU frequency synthesis - all configurable via RCC registers without external components.

Key Specifications

Pinout & Package

STM32L031G6U7 is housed in a 28-pin Ultra Thin Fine Pitch Quad Flat No-lead (UFQFPN28) package measuring 4 × 4 mm with 0.5 mm pitch. The package supports reflow soldering, offers excellent thermal performance (θ_JA = 150 °C/W), and is ECOPACK®2 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L031G6U7, STM32L011K4T6 trades EEPROM and Flash capacity for lower unit cost, while EFM32HG322F64G offers larger Flash but lacks on-chip EEPROM and consumes more power in active modes - making STM32L031G6U7 optimal for applications requiring robust, long-term nonvolatile parameter storage with minimal power overhead.

Availability

STM32L031G6U7 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, portable medical devices, and asset tracking tags requiring stable component supply and long-term lifecycle assurance.

Supply support for STM32L031G6U7 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, and rich analog integration - specifically engineered for IoT edge nodes, wearables, and energy-harvesting systems.

FAQ

What is the maximum operating frequency and corresponding power consumption in Run mode?

The STM32L031G6U7 operates up to 32 MHz with dynamic voltage scaling. At 32 MHz and 3.3 V supply, typical Run mode current is 76 µA/MHz (≈2.43 mA total). This value assumes code execution from Flash with peripherals disabled; adding active peripherals increases current linearly per their datasheet specifications.

Does STM32L031G6U7 support hardware encryption or secure boot?

No, the STM32L031G6U7 does not integrate hardware cryptographic accelerators or secure boot ROM. It relies on software-based AES libraries and external secure elements for advanced security. However, its 96-bit unique ID and ECC-protected Flash/EEPROM provide foundational integrity and device identity capabilities.

Can the internal 16 MHz RC oscillator be used as the system clock without calibration?

Yes - the HSI16 oscillator is factory-trimmed to ±1% accuracy across voltage and temperature. It can serve as the default system clock immediately after reset without external components or runtime calibration, enabling fast startup and reduced BOM cost in cost-sensitive designs.

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

22 GPIO pins (PA0–PA15, PB0–PB1, PC6–PC7, PC10–PC11) are 5V tolerant on the STM32L031G6U7. This is confirmed in Section 6.3.13 of DS10668 Rev 6. Tolerance applies only when VDD is ≥2.0 V and pins are configured as inputs or open-drain outputs with no pull-up to 5V.