STMicroelectronics STM32F031K6U7

Overview

STM32F031K6U7 from STMicroelectronics is a 32-bit ARM® Cortex®-M0 microcontroller with 32 KB Flash, 4 KB SRAM (HW parity), 48 MHz max CPU frequency, 12-bit 1.0 µs ADC (10-channel), and integrated peripherals including I²C (Fast Mode Plus), USART (LIN/IrDA/ISO7816), SPI (18 Mbit/s), and 9 timers - deployed in industrial sensor nodes, smart metering front-ends, and low-cost motor control modules.

For engineers reviewing the STM32F031K6U7 datasheet, STM32F031K6U7 pinout, STM32F031K6U7 application, or STM32F031K6U7 equivalent, key selection criteria include 5 V-tolerant I/O count (26 pins), extended temperature range (–40 to +105°C), ECOPACK®2 compliance, SWD debug interface, and RTC with alarm/wakeup from Stop/Standby modes.

Technical Context

The device implements a single-cycle ARM Cortex-M0 core with Thumb-2 instruction set, supporting deterministic real-time execution. Memory subsystem includes tightly coupled Flash with prefetch buffer and SRAM with hardware parity checking for fault detection in safety-critical operation.

Clock architecture integrates multiple sources: 4–32 MHz HSE crystal oscillator, 32 kHz LSE for RTC, 8 MHz HSI with PLL (×6), and 40 kHz LSI for watchdog timing - enabling flexible power/performance trade-offs across Sleep, Stop, and Standby low-power modes.

Key Specifications

Pinout & Package

STM32F031K6U7 is housed in a 32-pin UFQFPN package (5 × 5 mm, 0.5 mm pitch), optimized for space-constrained PCB layouts while maintaining thermal performance up to 105°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F031K6U7, STM32F030F4P6 sacrifices RTC, parity, and PVD for lower cost and smaller footprint, while STM32F042F4P6 trades UFQFPN32 compactness for USB integration - making STM32F031K6U7 optimal for space-constrained, time-aware, and safety-conscious embedded control.

Availability

STM32F031K6U7 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart energy meter front-ends, and low-cost BLDC motor controllers requiring stable component supply across extended temperature and long product lifecycles.

Supply support for STM32F031K6U7 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 STM32F0 series targets cost-sensitive, resource-constrained embedded applications demanding high reliability, low power, and rapid time-to-market - with the F031 subfamily optimized for analog-rich, timing-critical control tasks.

FAQ

What is the maximum operating frequency of the STM32F031K6U7?

The STM32F031K6U7 features an ARM Cortex-M0 core rated for up to 48 MHz operation. This frequency is achieved using the internal 8 MHz HSI oscillator with ×6 PLL multiplication, or directly from an external 4–32 MHz crystal oscillator. All peripherals remain fully functional at this speed, and timing specifications in the datasheet (DocID025743 Rev 6) are validated across the full –40 to +105°C temperature range.

Does the STM32F031K6U7 support hardware CRC calculation?

Yes, the STM32F031K6U7 includes a dedicated cyclic redundancy check (CRC) calculation unit compliant with CRC-32 (IEEE 802.3). It supports programmable polynomial configuration and processes data in 32-bit words with zero wait-state throughput. This unit is used for firmware image integrity verification, communication packet checksumming, and safety-critical data validation in accordance with IEC 61508 diagnostic requirements.

How many I/O pins are 5 V tolerant on the STM32F031K6U7?

Up to 26 I/O pins on the STM32F031K6U7 are 5 V tolerant, as confirmed in Section 3.7 of the datasheet (DocID025743 Rev 6). These include all pins on GPIOA and GPIOB except PA13, PA14, PA15, PB3, and PB4 - which are reserved for SWD and must operate within VDD. This tolerance allows direct connection to 5 V peripherals without external level-shifting circuitry.

What debug interface does the STM32F031K6U7 provide?

The STM32F031K6U7 supports Serial Wire Debug (SWD) only - a 2-pin (SWDIO and SWCLK) interface compliant with ARM CoreSight standards. It enables full-speed flash programming, real-time variable inspection, breakpoint setting, and traceless debugging. No JTAG support is implemented; SWD is the sole standardized debug access method, and it operates independently of the system clock source.