STMicroelectronics STM32F031K4U6

Overview

STM32F031K4U6 from STMicroelectronics is a 32-bit ARM® Cortex®-M0 microcontroller with 16 KB Flash, 4 KB SRAM (with hardware parity), 48 MHz max CPU frequency, 12-bit 1.0 µs ADC (10-channel), and integrated RTC with alarm and wakeup from Stop/Standby-designed for cost-sensitive industrial control and smart sensor nodes requiring low-power operation and robust analog integration.

For engineers reviewing the STM32F031K4U6 datasheet, STM32F031K4U6 pinout, STM32F031K4U6 application, or STM32F031K4U6 equivalent, key selection criteria include Flash/SRAM size, 5 V-tolerant I/O count (up to 26), real-time clock accuracy with calibration, PWM timer deadtime generation capability, and TSSOP20 package compatibility for space-constrained PCB layouts.

Technical Context

The STM32F031K4U6 implements a single-cycle ARM Cortex-M0 core with Thumb-2 instruction set, supporting deterministic interrupt latency via NVIC and hardware CRC acceleration for firmware integrity checks. Its clock system integrates dual oscillators (4–32 MHz HSE + 32 kHz LSE), internal 8 MHz RC with x6 PLL, and 40 kHz LSI for independent watchdog timing.

Peripheral architecture includes one advanced-control timer (TIM1) with 6-channel complementary PWM, deadtime insertion, and emergency stop-enabling brushless DC motor gate driving-and four general-purpose timers supporting IR modulation, input capture, and quadrature decoding. The 12-bit ADC operates across 0–3.6 V with separate VDDA supply and supports temperature sensor and VREFINT channels.

Key Specifications

Pinout & Package

STM32F031K4U6 is housed in a 20-pin TSSOP package (6.5 × 4.4 mm, 0.65 mm pitch), optimized for automated assembly and thermal performance in compact industrial modules. Pin functions are validated per ST's official pin definition table (DocID025743 Rev 6, Table 11).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F031K4U6, STM32F030F4P6 reduces feature set to cut cost where RTC and analog calibration are non-critical, while STM32F042F4P6 adds USB functionality at identical footprint-making it optimal for user-facing devices needing plug-and-play diagnostics.

Availability

STM32F031K4U6 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, energy metering interfaces, and home appliance UI controllers requiring stable component supply across long-lifecycle production programs.

Supply support for STM32F031K4U6 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, specializing in microcontrollers, power management, and analog/mixed-signal ICs for industrial, automotive, and consumer markets.

The STM32F0 series targets cost-optimized, ultra-low-power embedded applications-delivering Cortex-M0 performance with integrated analog peripherals and robust industrial qualification (-40°C to +105°C).

FAQ

Does STM32F031K4U6 support external crystal oscillators?

Yes-it supports 4–32 MHz high-speed external crystals (HSE) for precise clocking and a dedicated 32.768 kHz low-speed crystal (LSE) for RTC operation with ±20 ppm accuracy. Both are configurable via RCC registers and require external load capacitors per ST's layout guidelines (AN4915).

What is the maximum ADC sampling rate achievable?

The 12-bit ADC achieves up to 1 MSPS (1 million samples per second) when configured for single-channel conversions with 1.0 µs conversion time. With 10-channel sequence mode and auto-delay, effective throughput drops to ~100 kSPS due to channel switching overhead and sampling capacitor settling.

Can TIM1 generate complementary PWM outputs with programmable deadtime?

Yes-TIM1 is an advanced-control timer with dedicated deadtime insertion unit (DTI) that generates up to 6 complementary PWM outputs. Deadtime is programmable in steps of 1–1023 ns (based on APB clock), and emergency stop input (BKIN) can force all outputs to safe state within one clock cycle.

Is the TSSOP20 package RoHS and REACH compliant?

Yes-the STM32F031K4U6 in TSSOP20 meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. It carries ST's ECOPACK®2 certification, confirming halogen-free materials, lead-free terminations, and full substance declaration per IEC 62474.