STMicroelectronics STM32L031K6U7

Overview

STM32L031K6U7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5 × 5 mm) package, featuring 32 KB Flash with ECC, 8 KB SRAM, 1 KB EEPROM with ECC, 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 metering endpoints.

For engineers reviewing the STM32L031K6U7 datasheet, STM32L031K6U7 pinout, STM32L031K6U7 application, or STM32L031K6U7 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 sensing and secure firmware update designs.

Technical Context

The STM32L031K6U7 integrates a Cortex-M0+ core running up to 32 MHz with 0.95 DMIPS/MHz performance, supported by multiple clock sources: 16 MHz factory-trimmed HSI (±1%), 32 kHz LSE for RTC calibration, and programmable MSI (65 kHz–4.2 MHz). Its low-power architecture includes five operational modes - Run, Sleep, Low-power Run, Stop, and Standby - each with distinct peripheral enablement and retention policies.

Power management features include a 5-threshold BOR, programmable voltage detector (PVD), and ultralow-power POR/PDR. The interconnect matrix enables concurrent DMA transfers across ADC, USART, SPI, I²C, and timers without CPU intervention, supporting deterministic real-time response in event-driven sensor applications.

Key Specifications

Pinout & Package

STM32L031K6U7 uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package per STMicroelectronics DS10668 Rev 6, Table 72. This RoHS-compliant, ECOPACK®2-qualified package supports reflow soldering and offers thermal performance suitable for compact industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011K4U6, the STM32L031K6U7 adds 1 KB EEPROM and doubles Flash capacity for firmware resilience and parameter persistence; versus STM32L051K8U6, it trades USB and extra Flash for lower static current and smaller footprint - optimizing for minimal BOM cost and longest battery life in constrained nodes.

Availability

STM32L031K6U7 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, secure access tokens, and portable medical monitors requiring stable component supply and long-term industrial lifecycle support.

Supply support for STM32L031K6U7 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 devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, robust memory integrity, and certified security primitives - optimized for metering, wearables, and asset tracking where energy efficiency and reliability are non-negotiable.

FAQ

What is the maximum operating frequency and core type of the STM32L031K6U7?

The STM32L031K6U7 features an Arm Cortex-M0+ core rated for up to 32 MHz operation, delivering 0.95 DMIPS/MHz performance. It achieves this frequency using its internal 16 MHz HSI oscillator (factory-trimmed to ±1%) or external crystal sources, with PLL support for clock multiplication. The core includes single-cycle I/O access and nested vectored interrupt controller (NVIC) for deterministic real-time response.

Does the STM32L031K6U7 support hardware error correction for memory?

Yes, the STM32L031K6U7 implements hardware ECC (Error Correction Code) on both its 32 KB Flash and 1 KB EEPROM. This detects and corrects single-bit errors and detects double-bit errors, ensuring data integrity over extended temperature ranges and lifetime - critical for firmware storage and nonvolatile parameter retention in unattended deployments.

How many I/O pins are 5V tolerant, and what is their functional scope?

31 of the 32 GPIO pins on the STM32L031K6U7 are 5V tolerant (PA0–PA15, PB0–PB15, except NRST and BOOT0). These support all standard GPIO modes (input, output, alternate function) and can interface directly with 5V logic without external level shifters - simplifying design in mixed-voltage systems such as those incorporating legacy sensors or industrial I/O modules.

What low-power modes does the STM32L031K6U7 offer, and what is the lowest achievable current draw?

The STM32L031K6U7 provides five low-power modes: Sleep, Low-power Run, Stop, Standby, and Shutdown. The lowest current draw is 0.23 µA in Standby mode with two wakeup pins enabled and the ultra-low-power regulator active. In Stop mode with RTC and 8 KB RAM retention, it draws 0.6 µA - enabling decade-scale battery operation in intermittent-sensing applications.