STMicroelectronics STM32F051K4U7

Overview

STM32F051K4U7 from STMicroelectronics is an ARM® Cortex®-M0 32-bit microcontroller with 16 KB Flash, 8 KB SRAM, and integrated peripherals including a 12-bit ADC, 12-bit DAC, two USARTs (one with LIN/IrDA), two I²C interfaces (one Fast Mode Plus), and up to 36 5 V-tolerant GPIOs - deployed in industrial sensor nodes and low-cost motor control systems.

For engineers reviewing the STM32F051K4U7 datasheet, STM32F051K4U7 pinout, STM32F051K4U7 application, or STM32F051K4U7 equivalent, key selection criteria include its 48 MHz max CPU frequency, 2.0–3.6 V operating range, 16-pin UFQFPN package with 5 V-tolerant I/Os, and support for capacitive touch sensing on up to 18 channels.

Technical Context

The STM32F051K4U7 implements a single-cycle ARM Cortex-M0 core with Harvard bus architecture and tightly coupled NVIC supporting 32 interrupt vectors. Its memory subsystem includes 16 KB of Flash with error correction and 8 KB of SRAM with hardware parity checking, enabling robust operation in noise-sensitive environments.

Clock management integrates multiple sources: 4–32 MHz external crystal, 32 kHz RTC oscillator, 8 MHz internal RC with PLL (up to 48 MHz), and 40 kHz LSI - all configurable via RCC registers. Power management supports Sleep, Stop, and Standby modes with programmable voltage detector (PVD) and VBAT backup for RTC and registers.

Key Specifications

Pinout & Package

STM32F051K4U7 uses a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN) package, 5 mm × 5 mm, 0.5 mm pitch, with exposed thermal pad. Pinout conforms to ST's K4 variant (16 KB Flash, 32-pin UFQFPN), verified against ST DocID022265 Rev 7 Section 4 (Pinouts and pin descriptions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F030F4P6 and STM32F070F6P6, the STM32F051K4U7 uniquely balances analog integration (12-bit DAC + ADC), capacitive touch, and motor control peripherals in a compact 32-pin package - making it optimal for cost-sensitive embedded systems requiring mixed-signal capability.

Availability

STM32F051K4U7 is available at Aetrix Electronics and suitable for industrial sensor nodes, brushless DC motor control, smart home touch panels, and POS terminal peripherals requiring stable component supply across extended production cycles.

Supply support for STM32F051K4U7 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 requiring ARM Cortex-M0 performance, low-power operation, and rich analog/motor control peripherals - optimized for rapid development and high-volume deployment.

FAQ

What is the maximum operating frequency and supply voltage range for STM32F051K4U7?

The STM32F051K4U7 operates at up to 48 MHz with a core supply (VDD) range of 2.0 V to 3.6 V. The analog supply (VDDA) must be between 2.4 V and 3.6 V for full ADC/DAC specification compliance. All I/Os are 5 V-tolerant regardless of VDD level, enabling robust interfacing with mixed-voltage systems.

Does STM32F051K4U7 support hardware-based capacitive touch sensing?

Yes - it integrates a dedicated Touch Sensing Controller (TSC) supporting up to 18 channels for touchkey, linear, and rotary sensors. The TSC includes built-in charge transfer, synchronization, and noise filtering, eliminating the need for external touch ICs and reducing firmware complexity in HMI applications.

What debug interface does STM32F051K4U7 provide, and how is it accessed?

The device provides Serial Wire Debug (SWD) via SWCLK and SWDIO pins (PA14 and PA13), supporting full JTAG/SWD debugging, flash programming, and real-time tracing. No external debug probe is required beyond standard ST-LINK/V2 or compatible adapters, and SWD operates at full 48 MHz speed without additional configuration.

Can STM32F051K4U7 generate precise PWM waveforms for motor control?

Yes - its advanced-control timer (TIM1) delivers six complementary PWM outputs with programmable deadtime insertion, automatic fault handling, and emergency stop. This enables safe, high-efficiency 3-phase BLDC or stepper motor control without external gate drivers or protection logic.