STMicroelectronics STM32L031E6Y6DTR

Overview

STM32L031E6Y6DTR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN28 (4×4 mm) package, featuring 32 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 metering endpoints.

For engineers reviewing the STM32L031E6Y6DTR datasheet, STM32L031E6Y6DTR pinout, STM32L031E6Y6DTR application, or STM32L031E6Y6DTR 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, 31 5V-tolerant I/Os, and integrated pre-programmed USART/SPI bootloader.

Technical Context

The STM32L031E6Y6DTR implements a single-core Arm Cortex-M0+ running up to 32 MHz with 0.95 DMIPS/MHz performance and dynamic voltage scaling. Its low-power architecture integrates five distinct sleep modes-Run, Sleep, Low-power Run, Low-power Sleep, Stop, and Standby-with configurable wake-up sources including 2 dedicated pins and 16 EXTI lines.

Clock management includes multiple internal sources (HSI16 ±1%, LSI 37 kHz, MSI 65 kHz–4.2 MHz) and external options (1–25 MHz HSE, 32 kHz LSE for RTC). The reset system features a 5-threshold brownout detector (BOR), programmable voltage detector (PVD), and POR/PDR with ultralow power consumption.

Key Specifications

Pinout & Package

STM32L031E6Y6DTR uses the UFQFPN28 (4 × 4 mm, 0.5 mm pitch) package, compliant with ECOPACK®2 environmental standards and optimized for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011E4Y6DTR, the STM32L031E6Y6DTR provides double Flash and integrated EEPROM for reliable data logging; versus STM32L051K8U6, it trades USB functionality for lower static power and smaller 28-pin footprint-critical for miniature battery-operated designs.

Availability

STM32L031E6Y6DTR is available at Aetrix Electronics and suitable for smart metering, wireless sensor networks, portable medical devices, and asset tracking tags requiring stable component supply across extended product lifecycles.

Supply support for STM32L031E6Y6DTR 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 ICs, sensors, and automotive semiconductors since 1987.

The STM32L0 series targets ultra-low-power embedded applications, emphasizing energy efficiency, integrated analog peripherals, and long-term reliability for battery-operated and energy-harvesting systems.

FAQ

What is the maximum operating frequency and core type of the STM32L031E6Y6DTR?

The STM32L031E6Y6DTR features an Arm Cortex-M0+ core rated for up to 32 MHz operation, delivering 0.95 DMIPS per MHz. Its maximum frequency is achievable across the full 1.65–3.6 V supply range with dynamic voltage scaling enabled, and it supports both integer and fractional PLL multiplication for flexible clock tree design.

Does the STM32L031E6Y6DTR support hardware error correction on its memory blocks?

Yes, the STM32L031E6Y6DTR implements hardware ECC (Error Correction Code) on both its 32 KB Flash and 1 KB EEPROM memory blocks. This ensures automatic detection and correction of single-bit errors and detection of multi-bit errors, significantly improving data integrity in long-duration deployments subject to radiation or wear-out effects.

How many I/O pins are 5V tolerant, and what is the significance for system design?

The STM32L031E6Y6DTR has 31 5V-tolerant I/O pins, meaning they safely accept 5V logic signals while operating from a 1.65–3.6 V supply. This eliminates the need for external level shifters when interfacing with legacy 5V peripherals such as sensors, displays, or industrial I/O modules, reducing BOM cost and PCB complexity.

Can the STM32L031E6Y6DTR operate from a coin-cell battery over its full temperature range?

Yes-the device operates from 1.65 V to 3.6 V across –40 to +125 °C and achieves 0.23 µA standby current with two wake-up pins active. Combined with its 32 kHz RTC oscillator calibration and EEPROM data retention, it supports decade-long operation on a single CR2032 coin cell in intermittently active applications like utility meters or environmental monitors.