STMicroelectronics STM32U031C6T6

Overview

STM32U031C6T6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller operating up to 56 MHz, featuring 64-Kbyte flash memory, 12-Kbyte SRAM with hardware parity, and integrated analog peripherals including a 12-bit ADC (0.4 µs conversion), 12-bit DAC, operational amplifier with PGA, and ultra-low-power comparator - deployed in battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM32U031C6T6 datasheet, STM32U031C6T6 pinout, STM32U031C6T6 application, or STM32U031C6T6 equivalent, key selection criteria include VBAT mode current (130 nA), Stop 2 mode consumption (630 nA with RTC), 53 fast I/Os (most 5 V-tolerant), and support for Arm® PSA Level 1 and SESIP Level 3 security certifications.

Technical Context

The device implements an ART Accelerator enabling 0-wait-state execution from flash at 56 MHz, paired with a 1-Kbyte instruction cache and 1.13 DMIPS/MHz performance. Its power architecture includes dual regulators (main and low-power) and dedicated analog supply (VDDA) for ADC/DAC/OPAMP/COMP, decoupled from digital VDD.

Core peripherals include a 32-bit general-purpose timer, 16-bit advanced motor-control timer, two low-power 16-bit timers active in Stop mode, RTC with hardware calendar and calibration, and 7-channel DMA with flexible mapping via DMAMUX - all coordinated through a 32-bit multi-AHB bus matrix and APB interconnect.

Key Specifications

Pinout & Package

STM32U031C6T6 is housed in a 32-pin UFQFPN package (5 × 5 mm, 0.5 mm pitch), optimized for thermal performance and PCB area efficiency in high-density designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L031K6T6, the STM32U031C6T6 adds integrated analog signal chain capability and deeper low-power modes; versus EFM32PG12B, it trades raw compute for 20× lower shutdown current and built-in analog front-end - making it optimal for battery-limited sensing endpoints.

Availability

STM32U031C6T6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable medical diagnostic tools requiring stable component supply across multi-year production cycles.

Supply support for STM32U031C6T6 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 STM32U0 series targets ultra-low-power embedded applications demanding <1 µA standby current, certified security, and integrated analog - specifically engineered for battery-operated edge devices where energy per cycle is the primary constraint.

FAQ

What is the minimum supply voltage for reliable operation of STM32U031C6T6?

The STM32U031C6T6 operates reliably from 1.71 V to 3.6 V on VDD. Below 1.71 V, brownout reset (BOR) activates to prevent undefined behavior; the device supports four programmable BOR thresholds for rising and falling edges, configurable via option bytes to match battery discharge profiles.

Does STM32U031C6T6 support hardware encryption or secure boot?

Yes. It includes secure boot with immutable root-of-trust, true random number generation (TRNG) certified to NIST SP 800-90B, and hardware protection features (HDP). Readout protection (RDP) offers three levels, including irreversible Level 2 that disables debug access - meeting Arm® PSA Level 1 and SESIP Level 3 certification prerequisites.

Can the integrated op-amp be used in standalone mode without external components?

Yes. The single rail-to-rail operational amplifier includes a built-in programmable gain amplifier (PGA) with gains up to 16, and supports unity-gain buffer, non-inverting, and inverting configurations using only internal resistors - enabling direct connection to sensors like thermistors or bridge transducers without external feedback networks.

How many wake-up sources are available in Standby mode?

Four dedicated wake-up pins (WKUP1–WKUP4) are available in Standby mode, along with RTC alarms, tamper events, and external reset. Wake-up latency is ≤5 µs from Standby to Run mode, and SRAM2 contents (4 Kbytes) can be retained using the low-power regulator - preserving context across deep sleep intervals.