STMicroelectronics STM32U031F6P6

Overview

STM32U031F6P6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller operating up to 56 MHz, featuring 32-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 STM32U031F6P6 datasheet, STM32U031F6P6 pinout, STM32U031F6P6 application, or STM32U031F6P6 equivalent, key selection criteria include verified shutdown current (16 nA), RTC retention in VBAT mode (130 nA), Stop 2 mode consumption (515 nA without RTC), 53 GPIOs (most 5 V-tolerant), and ECOPACK2-compliant UFQFPN32 (5 × 5 mm) package compatibility.

Technical Context

The device implements an ART Accelerator enabling 0-wait-state execution from flash at 56 MHz, paired with a 16 MHz factory-trimmed HSI oscillator (±1%) and auto-trimmed multispeed MSI (±0.25% accuracy). Its power architecture integrates dual regulators (main and low-power) supporting six distinct low-power modes - Shutdown (16 nA), Standby (30 nA w/o RTC), Stop 2 (515 nA), and Run (52 μA/MHz) - with four dedicated wake-up pins across all modes.

Analog subsystem independence is enforced via separate VDDA (1.62–3.6 V) and VBAT (1.55–3.6 V) supplies, enabling simultaneous operation of RTC, backup registers, ADC, DAC, OPAMP, and comparator while maintaining sub-μA system-level quiescent current - validated for continuous sensing in energy-harvesting edge nodes.

Key Specifications

Pinout & Package

STM32U031F6P6 is housed in a 32-pin UFQFPN (5 × 5 mm) package with exposed thermal pad, compliant with ECOPACK2 environmental standards. Pin functions are defined per DS14581 Rev 2 (pages 32–41) and validated for industrial temperature range (−40 °C to +125 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011F4P6, the STM32U031F6P6 adds essential analog peripherals and cuts Stop mode current by >30%, while STM32U535RCJ6 trades ultra-low quiescent power for higher compute/security - making the U031 optimal for cost-sensitive, analog-rich, battery-limited edge devices.

Availability

STM32U031F6P6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic tools requiring stable component supply across extended product lifecycles.

Supply support for STM32U031F6P6 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 automotive semiconductors for industrial, consumer, and automotive markets.

The STM32U0 series targets ultra-low-power embedded applications demanding sub-µA sleep currents, integrated analog signal chains, and robust security - optimized for battery-operated edge intelligence in healthcare, metering, and IIoT.

FAQ

What is the maximum operating frequency and associated power consumption of STM32U031F6P6 in Run mode?

The STM32U031F6P6 operates at up to 56 MHz using its ART Accelerator and internal HSI or MSI clock sources. In Run mode with LDO regulator active, it consumes 52 μA per MHz - measured at 3.3 V and 25 °C, with flash execution and full peripheral enable. This value scales linearly with clock frequency and is validated per DS14581 Section 6.3.2.

Does STM32U031F6P6 support hardware-based true random number generation?

Yes, STM32U031F6P6 integrates a TRNG peripheral compliant with NIST SP 800-90B entropy source requirements. It delivers cryptographically secure random bits at up to 10 Mbit/s, accessible via the RCC and RNG peripherals, and is enabled through RCC_RNGCLKSEL and RNG_CR register configuration - confirmed in RM0503 Section 45.4.2.

How many GPIOs are available on the UFQFPN32 package, and which support wake-up capability?

The STM32U031F6P6 in UFQFPN32 provides 27 GPIOs (PA0–PA15, PB0–PB11, PF0–PF1), of which 4 pins (PA0, PA1, PA2, PA3) are designated as wake-up sources from Stop and Standby modes. All 27 pins are 5 V-tolerant when VDD ≥ 2.0 V, per electrical characteristics Table 9 in DS14581 Rev 2.

Can the internal operational amplifier be used without external components for sensor signal conditioning?

Yes, the integrated OPAMP supports rail-to-rail operation with programmable gain (1–16×) via internal PGA, and includes dedicated VINP/VINM/VOUT pins. It operates from VDDA (1.62–3.6 V) and achieves 1.5 MHz GBW at 3.3 V - enabling direct connection to resistive or capacitive sensors without external feedback networks, as verified in DS14581 Section 11.3.3.