STMicroelectronics STM32F031K6U6TR

Overview

STM32F031K6U6TR from STMicroelectronics is a 32-bit ARM® Cortex®-M0 microcontroller with 32 KB Flash, 4 KB SRAM (with hardware parity), 48 MHz max CPU frequency, and integrated peripherals including 1×12-bit ADC (1.0 µs conversion), 9 timers (including advanced-control TIM1 with deadtime and emergency stop), and communication interfaces (I²C Fast Mode Plus, USART with IrDA/LIN/ISO7816, SPI up to 18 Mbit/s). It operates across 2.0–3.6 V supply and -40°C to +105°C temperature range, targeting compact industrial control and sensor node applications.

For engineers reviewing the STM32F031K6U6TR datasheet, STM32F031K6U6TR pinout, STM32F031K6U6TR application, or STM32F031K6U6TR equivalent, key selection criteria include Flash/SRAM size, 5 V-tolerant I/O count (up to 26 pins), real-time timer capabilities (e.g., TIM1 for motor gate drive), low-power mode wakeup timing (≤5 µs from Stop), and package compatibility (UFQFPN32, 5×5 mm).

Technical Context

The device implements an ARM Cortex-M0 core with Harvard architecture, supporting Thumb-2 instruction set and NVIC-based interrupt handling. Its clock system integrates multiple sources: 4–32 MHz HSE crystal, 32 kHz LSE for RTC, 8 MHz HSI with x6 PLL for system clock, and 40 kHz LSI for watchdogs - enabling flexible trade-offs between accuracy, power, and startup time.

Peripheral interconnect uses AHB/APB buses with DMA support for ADC, USART, SPI, and I²C; the 12-bit ADC features programmable sampling time, analog watchdog, and independent VDDA supply (2.4–3.6 V), while TIM1 provides complementary PWM outputs with configurable deadtime and synchronous emergency shutdown - critical for brushless DC motor control.

Key Specifications

Pinout & Package

STM32F031K6U6TR is housed in a 32-pin UFQFPN package (5×5 mm, 0.5 mm pitch), optimized for space-constrained PCB layouts. Pin functions are fully defined per ST's DocID025743 Rev 6, Section 4 (Pinouts and pin description), with dedicated VDD/VSS pairs, NRST, BOOT0, and SWDIO/SWCLK debug interface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F031K6U6TR, STM32F030F4P6 offers lower cost but sacrifices SRAM parity and advanced timer safety features essential for motor control; STM32F042F6P6 adds USB but removes 5 V tolerance, increasing external component count for mixed-voltage systems.

Availability

STM32F031K6U6TR is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, IoT sensor nodes, and automotive body electronics requiring stable component supply across extended temperature and long product lifecycles.

Supply support for STM32F031K6U6TR 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 ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STM32F0 series targets cost-sensitive, resource-constrained embedded applications demanding high integration, low power, and industrial-grade reliability - with the F031 subfamily emphasizing motor control, metering, and sensor fusion.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM32F031K6U6TR achieves a maximum CPU frequency of 48 MHz using its internal 8 MHz HSI oscillator multiplied by a 6× PLL. This configuration avoids external crystal cost while maintaining timing precision sufficient for motor control loops and communication baud rate generation. The PLL lock time is typically 100 µs, enabling rapid wake-from-Stop transitions.

Does this MCU support hardware-based cryptographic operations?

No, the STM32F031K6U6TR does not include dedicated cryptographic accelerators (e.g., AES, SHA, or PKA). It relies on software libraries for encryption tasks. For secure boot or key storage, developers must implement trusted execution environments using SRAM parity error detection and external secure elements - as confirmed in the reference manual RM0091 Section 3.3.3.

Can the 12-bit ADC measure signals beyond the VDDA supply range?

No. The ADC input voltage range is strictly 0 to VDDA, with VDDA specified between 2.4 V and 3.6 V. Applying signals above VDDA risks damage or invalid conversions. The datasheet explicitly prohibits overvoltage on ADC inputs, and no internal clamping or rail-to-rail input structure is provided - external signal conditioning is required for wider-range measurements.

Is the UFQFPN32 package RoHS-compliant and lead-free?

Yes. The STM32F031K6U6TR in UFQFPN32 packaging complies with RoHS Directive 2011/65/EU and is lead-free, as documented in ST's ECOPACK®2 environmental compliance statement (DocID17147). The package uses matte tin terminal finish and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) for standard SMT assembly.