STMicroelectronics STM32C031K4T7TR

Overview

STM32C031K4T7TR from STMicroelectronics is a 32-bit Arm® Cortex®-M0+ microcontroller with 32 KB flash, 12 KB SRAM, 48 MHz max CPU frequency, 2× USART, 12-bit ADC (19 channels), and operates from 2.0–3.6 V. It targets cost-sensitive industrial control, smart sensors, and power management modules requiring robust low-power operation and 5 V-tolerant I/Os.

For engineers reviewing the STM32C031K4T7TR datasheet, STM32C031K4T7TR pinout, STM32C031K4T7TR application, or STM32C031K4T7TR equivalent, key selection considerations include its LQFP32 package, -40°C to 125°C extended temperature grade, hardware parity-protected SRAM, programmable brownout reset, and integrated calendar RTC with alarm-critical for battery-backed embedded systems.

Technical Context

The STM32C031K4T7TR integrates an Arm Cortex-M0+ core with MPU, supporting memory protection and deterministic real-time execution. Its clock system combines a 4–48 MHz HSE oscillator, 32 kHz LSE with calibration, and ±1% internal 48 MHz HSI48 RC oscillator-enabling precise timing without external crystals in many applications.

Peripheral interconnect uses a multi-layer AHB/APB bus matrix with DMA controller (3 channels) and flexible remapping. Analog subsystem includes a 12-bit ADC with 0.4 µs conversion time, internal temperature sensor, and VREFINT, all calibrated at factory and accessible via dedicated registers.

Key Specifications

Pinout & Package

LQFP32 (7 × 7 mm, 0.8 mm pitch) package with 29 user I/Os, including 3x analog inputs, 2x USART TX/RX, 1x I²C, 1x SPI, and dedicated NRST, BOOT0, VDD/VSS pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32C031K4T7TR, the STM32C011F4U6TR sacrifices RTC, dual USART, and I/O count for smaller footprint and lower cost, while the STM32G031F8P6 trades 5 V tolerance and automotive temp range for USB connectivity-making the C031K4T7TR optimal for rugged, multi-interface industrial nodes.

Availability

STM32C031K4T7TR is available at Aetrix Electronics and suitable for industrial motor control, smart power outlets, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM32C031K4T7TR 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, high-reliability embedded applications-delivering Cortex-M0+ performance with extended temperature support, robust peripheral sets, and simplified qualification paths for industrial and automotive Tier-2 suppliers.

FAQ

What is the maximum operating frequency and core type of the STM32C031K4T7TR?

The STM32C031K4T7TR features an Arm Cortex-M0+ core rated for up to 48 MHz operation. This frequency is achievable using the internal 48 MHz HSI48 oscillator (±1% accuracy) or an external crystal up to 48 MHz. The core includes a Memory Protection Unit (MPU) and supports Thumb-2 instruction set for efficient code density and real-time responsiveness.

Does the STM32C031K4T7TR support hardware parity checking on RAM?

Yes, the 12 KB SRAM includes hardware parity checking, automatically detecting single-bit errors during read operations. When enabled, a parity error triggers a HardFault exception, allowing firmware to log faults or initiate safe shutdown. Parity is configurable per memory region and requires no software overhead during normal access.

Can the STM32C031K4T7TR operate without an external crystal?

Yes-it can run entirely from internal oscillators: the 48 MHz HSI48 (±1%) for main system clock and 32 kHz LSI (±5%) for RTC and watchdogs. The HSI48 is factory-trimmed and requires no external components, making it ideal for cost-sensitive designs where crystal accuracy is not critical for timing-critical peripherals.

What low-power modes are supported and what is the lowest current draw?

The device supports Sleep, Stop, Standby, and Shutdown modes. In Stop mode with RTC running and ultra-low-power regulator enabled, typical current is ≤1.2 µA at 25°C. Wake-up time from Stop is ≤5 µs via EXTI or RTC alarm, enabling rapid response to external events while maintaining multi-year battery life in intermittent-sensing applications.