STMicroelectronics STM32C031G6U3TR

Overview

STM32C031G6U3TR from STMicroelectronics is an Arm® Cortex®-M0+ 32-bit microcontroller with 32 KB flash, 12 KB SRAM, 48 MHz max CPU frequency, 2× USART, 12-bit ADC (19-channel), and 5 V-tolerant I/Os. It targets cost-sensitive industrial control, smart sensors, and power management systems requiring low-power operation and robust peripheral integration.

For engineers reviewing the STM32C031G6U3TR datasheet, STM32C031G6U3TR pinout, STM32C031G6U3TR application, or STM32C031G6U3TR equivalent, key selection criteria include operating voltage range (2.0–3.6 V), temperature grade (–40°C to 85°C), UFQFPN28 package footprint, and integrated peripherals including RTC, DMA, and SWD debug support.

Technical Context

The STM32C031G6U3TR implements a single-core Arm Cortex-M0+ with Memory Protection Unit (MPU), supporting deterministic real-time execution and memory isolation. Its clock system integrates four oscillators: 4–48 MHz HSE, 32 kHz LSE with calibration, 48 MHz HSI48 (±1%), and 32 kHz LSI (±5%).

Peripheral interconnect uses a multi-layer AHB/APB bus matrix enabling concurrent access to flash, SRAM, and peripherals. The device supports five low-power modes (Sleep, Stop, Standby, Shutdown, and Low-power Run) with wake-up via GPIO, RTC alarm, or USART event - critical for battery-powered edge nodes.

Key Specifications

Pinout & Package

STM32C031G6U3TR is housed in a 28-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN28) package, 4 mm × 4 mm, 0.5 mm pitch, with exposed thermal pad. This RoHS-compliant, ECOPACK2-qualified package supports automated assembly and efficient thermal dissipation in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32C011F4U6TR, the STM32C031G6U3TR adds RTC and advanced timer for time-aware control; versus STM32G031F8P6, it trades USB and extended temperature for smaller size and lower system cost in space-constrained industrial modules.

Availability

STM32C031G6U3TR is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, power supply monitors, and POS terminal peripherals requiring stable component supply across long-lifecycle production programs.

Supply support for STM32C031G6U3TR 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 devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM32C0 series targets cost-optimized, entry-level embedded applications with emphasis on low power, small footprint, and ease of certification - delivering Cortex-M0+ performance in ultra-compact packages for high-volume industrial IoT endpoints.

FAQ

What is the maximum operating frequency and supported voltage range?

The STM32C031G6U3TR operates at up to 48 MHz and supports a supply voltage range of 2.0 V to 3.6 V. Its internal voltage regulator maintains stable core operation across this range, and the device includes programmable brownout reset with three threshold levels (2.1 V, 2.4 V, 2.7 V) to ensure reliable behavior during voltage transients.

Does this MCU support hardware encryption or secure boot?

No, the STM32C031G6U3TR does not include hardware cryptographic accelerators or secure boot features. It provides readout protection (RDP) Level 1 and Level 2 for flash memory, along with a memory protection unit (MPU) for runtime privilege separation, but lacks AES, SHA, or public-key acceleration blocks found in higher-tier STM32 families.

Can the internal 48 MHz RC oscillator be used as the system clock source?

Yes, the internal 48 MHz HSI48 oscillator (±1% accuracy) can serve as the system clock source without external components. It is factory-trimmed and supports automatic calibration against the LSE, making it suitable for applications where crystal cost or board space is constrained - though external HSE offers higher precision for timing-critical UART or USB functions.

What debug interfaces are available and what pins do they require?

The STM32C031G6U3TR supports Serial Wire Debug (SWD) only, using two dedicated pins: SWDIO (PA13) and SWCLK (PA14). No JTAG support is provided. These pins are shared with GPIO functionality and must be configured in SWD mode during debug initialization; no additional pins (e.g., NRST) are required for basic debug operations.