STMicroelectronics STM32C031K4U6

Overview

STM32C031K4U6 from STMicroelectronics is a 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5 × 5 mm) package, featuring 32 KB flash, 12 KB SRAM with hardware parity, 48 MHz max CPU frequency, 12-bit 0.4 µs ADC (up to 19 channels), and dual USARTs with LIN/IrDA/ISO7816 support - deployed in industrial sensor nodes and smart metering front-ends.

For engineers reviewing the STM32C031K4U6 datasheet, STM32C031K4U6 pinout, STM32C031K4U6 application, or STM32C031K4U6 equivalent, key selection criteria include 5 V-tolerant I/O count (up to 45), low-power Stop/Standby modes (down to 120 nA), integrated CRC unit, hardware memory protection (MPU), and dual clock sources (48 MHz HSI ±1 %, 32 kHz LSE with calibration).

Technical Context

The STM32C031K4U6 integrates an Arm Cortex-M0+ core with Memory Protection Unit (MPU) for deterministic real-time execution and secure peripheral access control. It supports boot from system memory, main flash, or SRAM, with configurable reset vector mapping and readout protection (RDP) levels.

Clock architecture includes four independent sources: 4–48 MHz HSE crystal oscillator, 32 kHz LSE with factory calibration, 48 MHz HSI (±1 %), and 32 kHz LSI (±5 %), all managed by a flexible clock controller supporting dynamic switching and prescaler configuration for peripherals including timers, ADC, and communication interfaces.

Key Specifications

Pinout & Package

STM32C031K4U6 uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32 pins, compliant with ECOPACK2 environmental standards. Pin functions are fully defined per ST's DS13867 Rev 4, Section 4 (Pin assignment and description), Figure 6.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32C031K4U6, STM32G031F8P6 trades calendar RTC and I/O count for higher clock speed in smaller package, while RP2040 sacrifices analog integration and 5 V tolerance for raw compute density - making STM32C031K4U6 optimal for cost-constrained, analog-rich, battery-operated industrial endpoints.

Availability

STM32C031K4U6 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart energy meters, home appliance controllers, and portable medical diagnostics requiring stable component supply across multi-year production cycles.

Supply support for STM32C031K4U6 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 management ICs, MEMS, and automotive semiconductors since 1987.

The STM32C0 series targets cost-sensitive, high-volume industrial and consumer applications demanding robust analog integration, ultra-low-power operation, and simplified certification - delivering Cortex-M0+ performance in minimal footprint packages.

FAQ

What is the maximum operating temperature range for STM32C031K4U6?

The STM32C031K4U6 is qualified for industrial operation from –40 °C to +85 °C ambient temperature, with extended variants rated to +105 °C and +125 °C. This rating is validated per JEDEC JESD47 and applies to all electrical characteristics in DS13867 Rev 4, Table 24.

Does STM32C031K4U6 support USB device functionality?

No, STM32C031K4U6 does not include a USB peripheral. It provides USARTs (one with ISO7816/LIN/IrDA), I²C, SPI, and SWD debug - but no USB PHY or controller. For USB connectivity, designers must use external USB-to-UART bridges or select STM32G0/G4 series parts with integrated USB FS.

How many USARTs support LIN physical layer compliance?

One USART (USART1) supports LIN 2.2 physical layer compliance via dedicated LIN break detection, auto-baud rate synchronization, and wakeup-from-Stop capability - confirmed in DS13867 Rev 4, Section 3.18 and Table 9.

Is the 32 kHz LSE oscillator calibrated at factory?

Yes, the 32 kHz LSE oscillator is factory-calibrated with trim values stored in system memory (address 0x1FFF_75A0), enabling ±20 ppm accuracy over –40 °C to +85 °C without external trimming capacitors - documented in DS13867 Rev 4, Section 3.9 and Table 40.