STMicroelectronics STM32F031K6T6

Overview

STM32F031K6T6 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, 12-bit 1.0 µs ADC (10-channel), and integrated RTC with alarm-designed for cost-sensitive industrial control, smart sensors, and low-power HMI applications.

For engineers reviewing the STM32F031K6T6 datasheet, STM32F031K6T6 pinout, STM32F031K6T6 application, or STM32F031K6T6 equivalent, key selection criteria include Flash/SRAM size, 5 V-tolerant I/O count (up to 26), low-power mode timing (Stop/Standby wakeup), I²C Fast Mode Plus support (1 Mbit/s), and TSSOP20 package compatibility with legacy PCB layouts.

Technical Context

The device implements a single-cycle ARM Cortex-M0 core with Thumb-2 instruction set, tightly coupled NVIC supporting up to 32 interrupts, and a unified memory map with bit-band aliasing for atomic peripheral register access. Its clock system integrates dual oscillators (4–32 MHz HSE + 32 kHz LSE), internal RC sources (8 MHz HSI, 40 kHz LSI), and a PLL for precise 48 MHz system clock derivation.

Peripheral interconnect uses AHB/APB bus matrix architecture: DMA controller routes transfers between memory and peripherals including USART, SPI, I²C, timers, and ADC-enabling zero-CPU-overhead data movement. All I/Os support remappable alternate functions via GPIOx_AFR registers, with configurable pull-up/pull-down, open-drain, and slew-rate control.

Key Specifications

Pinout & Package

The STM32F031K6T6 is housed in a 20-pin TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch), optimized for automated assembly and thermal performance in compact industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F030F4P6, the STM32F031K6T6 provides essential reliability features (RTC calendar, SRAM parity, PVD) for industrial control; versus STM32F042F4P6, it trades USB for lower BOM cost and simpler layout-ideal where USB is unused and thermal margin is adequate.

Availability

STM32F031K6T6 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, energy metering interfaces, and PLC I/O modules requiring stable component supply across multi-year production cycles.

Supply support for STM32F031K6T6 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-optimized, ultra-low-power 32-bit applications-emphasizing ease of migration from 8-bit MCUs while delivering Cortex-M0 performance, robust peripheral integration, and long-term product longevity for industrial equipment.

FAQ

What is the maximum operating frequency and corresponding supply voltage range?

The STM32F031K6T6 operates at up to 48 MHz across its full supply range of 2.0–3.6 V. At 48 MHz, the minimum recommended VDD is 2.4 V per electrical characteristics (Section 6.3.1). Below 2.4 V, maximum frequency must be reduced linearly to maintain timing margins-e.g., 24 MHz at 2.0 V.

Does this MCU support in-application programming (IAP) of Flash memory?

Yes, the STM32F031K6T6 supports IAP via its embedded Flash programming interface. Firmware can erase and reprogram Flash sectors (1 KB each) while executing from RAM or another sector, enabling field firmware updates without external programmers-subject to proper write-protection and address alignment per RM0091.

How many I/O pins support 5 V tolerance, and which ones are they?

Up to 26 I/O pins are 5 V tolerant, specifically PA0–PA7, PA9–PA15, PB0–PB1, and PB10–PB15. This is confirmed in Section 3.7 of the datasheet and applies regardless of VDD level (2.0–3.6 V). Pins not listed-including NRST, BOOT0, and SWD-must remain within VDD + 0.3 V.

What debug interfaces are supported, and what hardware is required?

The device supports Serial Wire Debug (SWD) only-using SWDIO and SWCLK pins. No JTAG support. A standard ARM-compliant SWD debugger (e.g., ST-LINK/V2, Segger J-Link) is required; no additional level-shifting or passive components are needed for 3.3 V debug signaling.