STMicroelectronics STM32C031K6U7TR

Overview

STM32C031K6U7TR from STMicroelectronics is a 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5 × 5 mm) package, featuring 32 KB flash, 12 KB SRAM with hardware parity, 48 MHz max CPU frequency, and integrated 12-bit ADC (0.4 µs conversion), two USARTs (one with ISO7816/LIN/IrDA), I²C Fast-mode Plus (1 Mbit/s), SPI (24 Mbit/s), and calendar RTC - deployed in industrial sensor nodes and smart metering front-ends.

For engineers reviewing the STM32C031K6U7TR datasheet, STM32C031K6U7TR pinout, STM32C031K6U7TR application, or STM32C031K6U7TR equivalent, key selection criteria include 5 V-tolerant GPIO count (up to 45), low-power Stop/Standby modes (down to 0.33 µA), BOR programmability, SWD debug support, and ECOPACK2 compliance for RoHS-compliant industrial designs.

Technical Context

The STM32C031K6U7TR implements an Arm Cortex-M0+ core with MPU, supporting Thumb-2 instruction set and up to 48 MHz operation via internal 48 MHz RC oscillator (±1 %) or external 4–48 MHz crystal. It integrates a 3-channel DMA controller with flexible peripheral mapping and supports boot from system memory, user flash, or SRAM.

Its analog subsystem includes a 12-bit ADC with 19 external channels, temperature sensor, and VREFINT reference; digital peripherals include one advanced-control timer (TIM1), four general-purpose 16-bit timers, two watchdogs (IWDG/WWDG), and SysTick - all synchronized through a multi-source clock tree with 32 kHz LSE calibration and internal 32 kHz RC (±5 %).

Key Specifications

Pinout & Package

STM32C031K6U7TR uses UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32 pins, exposing VDD/VSS power rails, NRST, BOOT0, SWDIO/SWCLK debug pins, and 25 user GPIOs mapped across Ports A, B, C, and F - fully compliant with ECOPACK2 environmental standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32C011F4U6TR, the STM32C031K6U7TR adds RTC, larger memory, and 5 V-tolerant I/Os for robust industrial interfacing; versus STM32G031F8P6, it trades USB for LIN/ISO7816 and maintains lower system-level EMI in electrically noisy environments.

Availability

STM32C031K6U7TR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart energy meters, automotive body control modules, and home appliance UI controllers requiring stable component supply across extended product lifecycles.

Supply support for STM32C031K6U7TR 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 management ICs, MEMS, and automotive-grade components since 1987.

The STM32C0 series targets cost-sensitive, high-volume industrial and consumer applications requiring robustness, low power, and rich analog integration - bridging the gap between legacy 8-bit MCUs and higher-end Cortex-M3/M4 devices.

FAQ

What is the maximum operating temperature rating for STM32C031K6U7TR?

The STM32C031K6U7TR is rated for −40°C to +125°C ambient operation per DS13867 Rev 4 Section 5.3.1. This extended temperature grade is validated for use in under-hood automotive auxiliary modules and industrial enclosures exposed to thermal cycling without derating.

Does STM32C031K6U7TR support hardware encryption or secure boot?

No. The STM32C031K6U7TR does not include hardware cryptographic accelerators (AES/RSA), secure ROM, or immutable secure boot. It provides readout protection (RDP) Level 1 and memory write protection, but security-critical applications require external secure elements or software-based key management.

Can the internal 48 MHz RC oscillator be used as the system clock without calibration?

Yes. The HSI48 oscillator operates at ±1 % accuracy over temperature and voltage without factory calibration. It is the default clock source after reset and supports full 48 MHz operation for USB-less applications - eliminating the need for an external crystal in cost-sensitive designs.

How many USARTs support LIN physical layer compliance?

Only USART1 (mapped to PA9/PA10) supports LIN 2.2A physical layer via its built-in slew-rate control and dominant timeout detection. USART2 lacks LIN-specific hardware features and requires external transceiver for LIN bus connection.