STMicroelectronics STM32F042K4T6TR

Overview

STM32F042K4T6TR from STMicroelectronics is a 32-bit ARM® Cortex®-M0 microcontroller in UFQFPN32 (5×5 mm) package, featuring 16 KB Flash, 6 KB SRAM with hardware parity, crystal-less USB 2.0 Full-Speed interface, CAN 2.0B controller, and integrated 48 MHz RC oscillator with automatic trimming. It operates from 2.0–3.6 V and supports capacitive touch sensing on up to 14 channels-used in industrial HMI panels requiring embedded USB-CDC communication and low-power sensor node control.

For engineers reviewing the STM32F042K4T6TR datasheet, STM32F042K4T6TR pinout, STM32F042K4T6TR application, or STM32F042K4T6TR equivalent, key selection criteria include USB clocking autonomy (no external crystal), CAN+USB coexistence in compact footprint, 5 V-tolerant I/O count (up to 24 pins), and verified BCD/LPM support for battery-powered USB devices.

Technical Context

The device integrates a single-cycle ARM Cortex-M0 core running at up to 48 MHz, coupled with a clock recovery system (CRS) that synchronizes the internal 48 MHz HSI48 oscillator to USB SOF packets-enabling crystal-less USB operation without sacrificing timing accuracy. Its memory subsystem includes 16 KB of Flash with error correction and 6 KB of SRAM with hardware parity checking, supporting robust firmware execution in safety-aware applications.

Power management includes three low-power modes (Sleep, Stop, Standby), programmable voltage detector (PVD), and dual-supply capability: VDDA (2.4–3.6 V) for analog peripherals and VDDIO2 (1.65–3.6 V) for selected I/O banks. The 12-bit ADC achieves 1.0 µs conversion time across 10 channels with dedicated analog supply and internal temperature sensor/VREFINT calibration.

Key Specifications

Pinout & Package

STM32F042K4T6TR uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32 terminals. This thermally enhanced, lead-free, ECOPACK®2-compliant package supports reflow soldering and offers improved thermal dissipation over TSSOP variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F042F4T6, the K4T6TR offers superior space efficiency and lower assembly cost in volume production; versus STM32F070F6P6, it provides essential CAN+USB integration unattainable in the F6P6's peripheral set-making it irreplaceable for dual-bus edge-node designs.

Availability

STM32F042K4T6TR is available at Aetrix Electronics and suitable for industrial HMI panels, USB-CDC sensor nodes, automotive diagnostic tools, and smart lighting controllers requiring stable component supply, long-term lifecycle assurance, and ECOPACK®2 compliance.

Supply support for STM32F042K4T6TR 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, delivering silicon solutions for automotive, industrial, and consumer markets since 1987.

The STM32F0 series targets cost-sensitive, resource-constrained embedded applications requiring ARM Cortex-M0 performance, USB connectivity, and analog integration - optimized for rapid development and production scalability.

FAQ

Does STM32F042K4T6TR require an external crystal for USB operation?

No. It features an internal 48 MHz HSI48 oscillator with automatic trimming synchronized to USB Start-of-Frame (SOF) packets, enabling fully crystal-less USB 2.0 Full-Speed operation. This eliminates the need for a 12 MHz crystal, associated load capacitors, and layout constraints - validated per USB-IF electrical compliance tests in ST's production data.

What is the maximum number of 5 V-tolerant I/O pins on this device?

STM32F042K4T6TR supports up to 24 5 V-tolerant I/O pins across GPIO ports A and B. These pins tolerate input voltages up to 5.5 V regardless of VDD level (2.0–3.6 V), enabling direct interfacing with 5 V sensors, logic, or displays without external level shifters - confirmed in Section 6.3.14 of the datasheet.

Can PA11 and PA12 be used simultaneously for both USB and CAN functions?

No. PA11 and PA12 are alternate-function multiplexed: they serve as USB DM/DP *or* CAN RX/TX, but not both concurrently. Function selection is controlled via SYSCFG register configuration at runtime. Dual-interface operation requires software-managed mode switching - e.g., USB for configuration, CAN for runtime data exchange.

Is the internal temperature sensor calibrated at factory?

Yes. Each unit undergoes individual calibration during production, with two-point calibration coefficients (30 °C and 110 °C) stored in system memory at addresses 0x1FFFF7B8 and 0x1FFFF7C2. These values enable accurate temperature measurement within ±1.5 °C over –40 to +85 °C - documented in Table 3 and Section 3.10.1 of the datasheet.