STMicroelectronics STM32C031C6U7

Overview

STM32C031C6U7 from STMicroelectronics is a 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN48 package, operating up to 48 MHz with 32 KB flash and 12 KB SRAM. It integrates dual USARTs (one with LIN/ISO7816), I²C Fast-mode Plus (1 Mbit/s), SPI (24 Mbit/s), 12-bit ADC (19 channels, 0.4 µs conversion), RTC, and 8 timers-including advanced motor control timer TIM1-targeting cost-sensitive industrial sensor nodes and smart actuators.

For engineers reviewing the STM32C031C6U7 datasheet, STM32C031C6U7 pinout, STM32C031C6U7 application, or STM32C031C6U7 equivalent, key selection criteria include its 5 V-tolerant GPIOs, hardware parity on SRAM, programmable brownout reset, 48 MHz internal RC oscillator (±1 %), and support for Stop/Standby low-power modes with wake-up via I²C or USART-critical for battery-operated edge devices requiring deterministic timing and robust memory integrity.

Technical Context

The STM32C031C6U7 implements an Arm Cortex-M0+ core with Memory Protection Unit (MPU), enabling secure task isolation in real-time embedded firmware. Its clock system combines four oscillators: 4–48 MHz HSE, 32 kHz LSE with calibration, 48 MHz HSI48 (±1 %), and 32 kHz LSI (±5 %), supporting precise RTC operation and fast wake-up from low-power states.

Peripheral interconnect uses a multi-layer AHB/APB bus matrix with DMA controller (3 channels) and DMAMUX for flexible peripheral-to-memory transfers. The ADC features hardware oversampling and injected channel sequencing, while TIM1 supports complementary PWM outputs with dead-time insertion-essential for BLDC motor gate driving without external logic.

Key Specifications

Pinout & Package

STM32C031C6U7 is housed in a 7 mm × 7 mm UFQFPN48 package (pitch: 0.5 mm), compliant with ECOPACK2 environmental standards and optimized for compact PCB layouts with thermal pad exposure.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32G031F8P6 and RP2040, the STM32C031C6U7 uniquely balances industrial-grade reliability (BOR, SRAM parity, 125°C rating) with automotive-ready interfaces (LIN, ISO7816), making it optimal for certified edge controllers where deterministic timing and long-term supply stability are non-negotiable.

Availability

STM32C031C6U7 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart actuator control, energy meter interfaces, and building automation controllers requiring stable component supply across extended product lifecycles.

Supply support for STM32C031C6U7 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, designing and manufacturing microcontrollers, power management ICs, and MEMS sensors for industrial, automotive, and consumer markets.

The STM32C0 series targets cost-optimized, high-reliability embedded applications-emphasizing robustness, low-power operation, and simplified certification paths for industrial equipment and smart infrastructure.

FAQ

What is the maximum operating frequency and voltage range of the STM32C031C6U7?

The STM32C031C6U7 operates at up to 48 MHz using its internal 48 MHz HSI48 oscillator (±1 % accuracy) or external crystal. Its supply voltage range is strictly 2.0 V to 3.6 V; operation outside this range may cause functional failure or permanent damage. The device supports programmable brownout reset at four thresholds to prevent erratic behavior during voltage droop.

Does the STM32C031C6U7 support hardware-based security features?

The STM32C031C6U7 includes a Memory Protection Unit (MPU) for runtime privilege separation between tasks, readout protection (RDP) levels to prevent flash memory extraction, and hardware CRC calculation for firmware integrity checks. It does not integrate cryptographic accelerators (AES, SHA) or secure boot ROM-those features appear in higher-tier STM32L5 or H5 series.

Can the STM32C031C6U7 drive 5 V logic directly?

Yes-all 45 GPIOs are 5 V-tolerant when configured as inputs or open-drain outputs, allowing direct interface to 5 V sensors, displays, or legacy microcontrollers without level shifters. However, output high-level voltage is VDD (max 3.6 V), so active-driving of 5 V logic inputs requires external pull-up or buffer circuitry.

What debug interface does the STM32C031C6U7 use, and what pins are required?

The STM32C031C6U7 uses Serial Wire Debug (SWD), requiring only two pins: SWDIO (PA13) and SWCLK (PA14). No reset pin is mandatory for basic debug, though NRST (PB0) is recommended for reliable recovery from lock-up. SWD supports full flash programming, breakpoints, and real-time variable inspection via standard tools like ST-Link v3 or OpenOCD.