STMicroelectronics STM32L031K6T6TR

Overview

STM32L031K6T6TR 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, 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, delivering 76 µA/MHz in Run mode and 0.35 µA in Stop mode - ideal for battery-powered sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L031K6T6TR datasheet, STM32L031K6T6TR pinout, STM32L031K6T6TR application, or STM32L031K6T6TR equivalent, key selection criteria include low-power mode timing (5 µs wakeup), 31 5V-tolerant I/Os, integrated RTC with 8 KB RAM retention, and support for ISO 7816/IRDA via USART - all critical for energy-constrained embedded control designs.

Technical Context

The STM32L031K6T6TR implements a single-core Arm Cortex-M0+ running up to 32 MHz with 0.95 DMIPS/MHz performance and dynamic voltage scaling. Its power architecture integrates five low-power modes (Run, Sleep, Low-power Run/Sleep, Stop, Standby), each with distinct peripheral availability and current draw - e.g., Stop mode retains RTC and 8 KB RAM at 0.6 µA.

Clock management includes multiple sources: 1–25 MHz HSE, 32 kHz LSE for RTC calibration, 16 MHz HSI16 (±1%), 37 kHz LSI, and a multispeed MSI (65 kHz–4.2 MHz), plus a PLL for CPU clock derivation. Reset and supply supervision feature a 5-threshold BOR, POR/PDR, and programmable PVD.

Key Specifications

Pinout & Package

STM32L031K6T6TR uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package per STMicroelectronics' mechanical data (Doc DS10668 Rev 6, Section 7.4). This RoHS-compliant, ECOPACK®2-qualified package supports reflow soldering and offers compact board space usage for portable devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011K4T6, the STM32L031K6T6TR adds 1 KB EEPROM and 16 KB Flash for field-upgradable firmware and calibration storage; versus STM32L051K8U6, it trades USB capability for lower standby current and smaller footprint - optimizing for pure battery longevity over interface flexibility.

Availability

STM32L031K6T6TR 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 across long-lifecycle industrial programs.

Supply support for STM32L031K6T6TR 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 analog products for industrial, automotive, and consumer markets.

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

FAQ

What is the maximum operating frequency and core type of the STM32L031K6T6TR?

The STM32L031K6T6TR features an Arm Cortex-M0+ core rated for up to 32 MHz operation, delivering 0.95 DMIPS/MHz. Its maximum frequency is achievable across the full 1.65–3.6 V supply range and –40 to +125 °C temperature span, with dynamic voltage scaling enabling optimized power/performance trade-offs in Run mode.

Does the STM32L031K6T6TR support hardware encryption or secure boot?

No, the STM32L031K6T6TR does not integrate hardware cryptographic accelerators (AES, SHA, PKA) or secure boot functionality. It relies on software-based security measures and external secure elements for authentication or encrypted firmware updates - unlike higher-tier STM32L4/L5 series that include TRNG and AES engines.

How many I/O pins are 5V tolerant, and which packages support them?

31 I/O pins on the STM32L031K6T6TR are 5V tolerant, confirmed in the "I/O port characteristics" section (Table 53) of DS10668 Rev 6. This applies specifically to the UFQFPN32 package variant (K6T6TR suffix), enabling direct interfacing with 5V logic without level-shifting circuitry - a key advantage over non-5V-tolerant L0-series variants in mixed-voltage systems.

What debug interface does the STM32L031K6T6TR provide, and what pins are required?

The STM32L031K6T6TR supports Serial Wire Debug (SW-DP) using two dedicated pins: SWDIO (PA13) and SWCLK (PA14). No NRST connection is mandatory for basic debug, though it improves reliability during firmware loading. This 2-pin interface replaces traditional JTAG, reducing PCB routing complexity while maintaining full breakpoint, register, and memory access capabilities.