STMicroelectronics STM32F031G4U7

Overview

STM32F031G4U7 from STMicroelectronics is an ARM® Cortex®-M0 32-bit microcontroller with 16 KB Flash, 4 KB SRAM (HW parity), 48 MHz max CPU frequency, 12-bit 1.0 µs ADC (10-channel), and integrated RTC with alarm-designed for cost-sensitive industrial control, smart sensor nodes, and low-power HMI interfaces.

For engineers reviewing the STM32F031G4U7 datasheet, STM32F031G4U7 pinout, STM32F031G4U7 application, or STM32F031G4U7 equivalent, key selection criteria include its TSSOP20 package footprint, 5 V-tolerant I/Os on up to 26 pins, 9 timer peripherals including advanced-control TIM1 with deadtime generation, and support for LIN/IrDA/ISO7816 via its single USART.

Technical Context

The device integrates a single-cycle ARM Cortex-M0 core with nested vectored interrupt controller (NVIC) and SysTick timer, paired with a flexible clock tree supporting 4–32 MHz HSE, 32 kHz LSE for RTC calibration, and internal 8 MHz RC with x6 PLL for system clock derivation.

Its peripheral set includes one I²C (Fast Mode Plus, 1 Mbit/s), one SPI (18 Mbit/s, I²S-mux), one USART with LIN break detection and IrDA modulation, five-channel DMA, and CRC calculation unit-enabling deterministic real-time control in space-constrained embedded systems.

Key Specifications

Pinout & Package

STM32F031G4U7 uses a 20-pin TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch), optimized for automated assembly and board-level space efficiency in compact industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F031G4U7, STM32F030F4P6 sacrifices reliability features (SRAM parity, RTC) and motor control capability (TIM1), while STM32F042F4P6 trades 5 V tolerance for USB integration-making STM32F031G4U7 optimal for mixed-voltage industrial edge nodes needing precise timing and robust analog acquisition.

Availability

STM32F031G4U7 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart HVAC controllers, POS peripheral modules, and medical diagnostic handhelds requiring stable component supply across extended temperature ranges (–40°C to +105°C).

Supply support for STM32F031G4U7 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, MEMS, and automotive ICs with vertical manufacturing and broad industrial certification coverage.

The STM32F0 series targets cost-optimized, entry-level Cortex-M0 applications-emphasizing low-power operation, rich analog integration, and ease of migration within the STM32 ecosystem for resource-constrained embedded designs.

FAQ

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

The STM32F031G4U7 operates at up to 48 MHz when supplied with 2.4–3.6 V. At 2.0–2.4 V, maximum frequency is reduced to 24 MHz per electrical characteristics table (Section 6.3.1). This voltage-frequency scaling ensures reliable timing margins across the full industrial temperature range (–40°C to +105°C).

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

Yes, it includes a dedicated CRC calculation unit compliant with IEEE-802.3 (32-bit polynomial 0x04C11DB7). The CRC peripheral is memory-mapped at address 0x40023000 and supports both 8- and 32-bit data writes; it is commonly used for firmware image integrity checks and communication packet validation without CPU overhead.

Can the internal 8 MHz RC oscillator be used as the system clock without an external crystal?

Yes-the internal 8 MHz RC oscillator (HSI) can directly drive the system clock or feed the x6 PLL to generate 48 MHz. It has ±1% typical accuracy at 25°C and is factory-trimmed; however, for RTC or communication timing requiring high precision (e.g., USART baud rates <1% error), an external 32.768 kHz LSE or 4–32 MHz HSE is recommended.

How many I/O pins support external interrupt capability, and what trigger modes are available?

All 16 GPIOs on Port A and all 13 GPIOs on Port B (29 total) can be configured for external interrupts via the EXTI controller. Each supports rising/falling/both-edge triggering and configurable priority levels through the NVIC. Interrupt vectors are individually assignable per pin, enabling responsive event-driven operation for pushbuttons, limit switches, or encoder quadrature signals.