STMicroelectronics STM32L031G6U6TR

Overview

STM32L031G6U6TR 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 performance at up to 32 MHz and supports -40 to +125 °C operation - deployed in battery-powered sensor nodes and smart utility meters requiring long-term autonomous operation.

For engineers reviewing the STM32L031G6U6TR datasheet, STM32L031G6U6TR pinout, STM32L031G6U6TR application, or STM32L031G6U6TR equivalent, key selection criteria include standby current (0.23 µA), RTC + 8 KB RAM retention in Stop mode (0.6 µA), 5 µs Flash wakeup time, and 31 I/Os with 5V tolerance - critical for energy-constrained embedded control and metering designs.

Technical Context

The STM32L031G6U6TR integrates a Cortex-M0+ core with dynamic voltage scaling, supporting three power supply ranges (1.65–3.6 V) and five low-power modes (Run, Sleep, Low-power Run/Sleep, Stop, Standby). Its clock system combines factory-trimmed 16 MHz HSI (±1%), 32 kHz LSE for RTC calibration, and PLL for CPU frequency multiplication.

Analog subsystem includes one 12-bit ADC (10-channel, 1.14 Msps), two ultra-low-power comparators (wake-up capable down to 1.65 V), and internal temperature sensor with calibrated reference. Memory protection covers sector-level Flash/EERPOM write/erase lock and 20-byte backup registers.

Key Specifications

Pinout & Package

STM32L031G6U6TR uses the UFQFPN28 (4 × 4 mm, 0.5 mm pitch) package with 28 terminals, optimized for space-constrained PCB layouts in portable and IoT edge devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011K4T6, the STM32L031G6U6TR adds 1 KB EEPROM and doubles Flash capacity - essential for secure firmware updates and runtime calibration. Versus STM32L053R8T6, it reduces package size and eliminates USB PHY - lowering cost and layout complexity for standalone sensor controllers.

Availability

STM32L031G6U6TR is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, industrial control panels, and portable medical devices requiring stable component supply across multi-year production cycles.

Supply support for STM32L031G6U6TR 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, and MEMS sensors for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications, emphasizing sub-µA standby operation, integrated EEPROM, and robust analog peripherals - engineered specifically for battery-operated and energy-harvesting systems.

FAQ

What is the maximum operating frequency and core architecture of the STM32L031G6U6TR?

The STM32L031G6U6TR features an Arm Cortex-M0+ core running at up to 32 MHz, delivering 0.95 DMIPS/MHz. Its maximum frequency is constrained by supply voltage: 32 MHz at 3.0–3.6 V, 24 MHz at 2.4–2.99 V, and 16 MHz at 1.65–2.39 V - verified per DS10668 Rev 6 Section 6.3.1.

Does the STM32L031G6U6TR support hardware encryption or secure boot?

No, the STM32L031G6U6TR does not include hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. Security relies on software-based implementations and flash protection mechanisms (readout protection, write protection). For certified secure boot, ST recommends STM32L4 or STM32H5 series MCUs.

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

31 I/Os are 5V tolerant - all GPIOs except those assigned to analog functions (e.g., ADC inputs) or dedicated system pins (NRST, BOOT0). This includes PA0–PA15, PB0–PB15, and PC13–PC15, as confirmed in Section 3.7 and Table 15 of DS10668 Rev 6.

What is the guaranteed data retention period for the 1 KB EEPROM?

The 1 KB data EEPROM retains data for 20 years at 85 °C and supports 100,000 write/erase cycles, as specified in Table 47 of DS10668 Rev 6. Retention is guaranteed under full temperature range (-40 to +125 °C) when operated within rated voltage and cycling limits.