STMicroelectronics STM32F031G4U6TR

Overview

STM32F031G4U6TR from STMicroelectronics is a 32-bit ARM® Cortex®-M0 microcontroller with 16 KB Flash, 4 KB SRAM, 48 MHz max CPU frequency, 12-bit ADC (1.0 µs conversion), and integrated RTC-designed for cost-sensitive industrial control, smart sensors, and power management modules requiring low-voltage operation (2.0–3.6 V) and extended temperature support (−40 to +105°C).

For engineers reviewing the STM32F031G4U6TR datasheet, STM32F031G4U6TR pinout, STM32F031G4U6TR application, or STM32F031G4U6TR equivalent, key selection criteria include its UFQFPN28 package footprint, 5 V-tolerant I/O count (up to 26 pins), single 12-bit ADC with 10-channel multiplexing, advanced timer with deadtime generation, and SWD debug interface compatibility.

Technical Context

The device implements a tightly coupled ARM Cortex-M0 core with Harvard bus architecture, supporting Thumb-2 instruction set and nested vectored interrupt controller (NVIC) for deterministic real-time response. It integrates a 4-channel DMA controller synchronized with peripherals including ADC, timers, and USART.

Clock management includes dual oscillators: a 4–32 MHz HSE crystal input and internal 8 MHz RC with x6 PLL for system clock generation, plus dedicated 32 kHz LSE for RTC calibration. Power domains separate digital (VDD) and analog (VDDA) supplies, enabling independent voltage scaling and low-power mode retention of RTC/backup registers via VBAT.

Key Specifications

Pinout & Package

STM32F031G4U6TR uses the UFQFPN28 (4 × 4 mm, 0.5 mm pitch) package - a space-efficient, thermally enhanced leadless QFN suitable for compact industrial PCB layouts and automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with STM32F031G4U6TR, STM32F030F4P6 sacrifices advanced timer and RTC capabilities for lower BOM cost, while STM32F042F4P6 trades 5 V tolerance for USB connectivity - making the G4U6TR uniquely balanced for industrial edge nodes needing robust I/O, precise timing, and battery-backed timekeeping.

Availability

STM32F031G4U6TR is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, IoT sensor nodes, and power supply monitoring requiring stable component supply across extended temperature and long product lifecycles.

Supply support for STM32F031G4U6TR 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, specializing in microcontrollers, power management, and automotive-grade ICs with strong industrial and consumer market presence.

This part belongs to the STM32F0 mainstream Arm Cortex-M0 series, designed specifically for cost-optimized, low-power embedded applications demanding rich peripheral integration and industrial reliability - not general-purpose computing or high-performance signal processing.

FAQ

What is the maximum operating frequency and corresponding supply voltage range?

The STM32F031G4U6TR achieves a maximum CPU frequency of 48 MHz when powered within the specified 2.0–3.6 V VDD range. Operation at 48 MHz requires the internal 8 MHz RC oscillator with PLL multiplication or an external 4–32 MHz crystal; full performance is guaranteed only above 2.4 V per electrical characteristics table in DocID025743 Rev 6.

Does this MCU support hardware CRC calculation and how is it implemented?

Yes, it includes a dedicated cyclic redundancy check (CRC) calculation unit compliant with CRC-32 standards. The peripheral operates independently of the CPU, accepts data via APB bus writes, and computes checksums for memory blocks or packet payloads - reducing firmware overhead in communication stacks and firmware update validation routines.

How many I/O pins are 5 V tolerant and which ports do they belong to?

Up to 26 I/O pins are 5 V tolerant, specifically PA0–PA15, PB0–PB1, and PB10–PB15 as defined in Table 11 (Pin definitions) of the datasheet. This capability allows direct connection to 5 V logic without external level shifters - critical for interoperability with legacy industrial sensors and actuators.

What debug interface does STM32F031G4U6TR use and what tools are compatible?

It uses Serial Wire Debug (SWD) with SWDIO and SWCLK pins - a 2-wire ARM-standard interface supported by ST-LINK v2/v3, J-Link, and CMSIS-DAP debug probes. No JTAG header is required, minimizing PCB footprint while enabling full flash programming, breakpoint setting, and real-time variable inspection during development.