STMicroelectronics STM32F042K6T6TR

Overview

STM32F042K6T6TR from STMicroelectronics is a 32-bit ARM® Cortex®-M0 microcontroller with 32 KB Flash, 6 KB SRAM, crystal-less USB 2.0 Full-Speed interface, CAN 2.0B controller, and integrated 12-bit ADC (1.0 µs conversion time). It operates from 2.0–3.6 V, supports up to 48 MHz CPU frequency, and targets embedded control applications requiring integrated connectivity and low-power operation-such as industrial sensor nodes and USB-CDC-based field devices.

For engineers reviewing the STM32F042K6T6TR datasheet, STM32F042K6T6TR pinout, STM32F042K6T6TR application, or STM32F042K6T6TR equivalent, key selection criteria include USB 2.0 FS timing tolerance without external crystal, CAN bus integration in LQFP48 package, 5 V-tolerant I/O count (up to 24), internal 48 MHz oscillator trimming via USB SOF, and support for capacitive touch sensing on 14 channels.

Technical Context

The device integrates an ARM Cortex-M0 core with tightly coupled NVIC, supporting nested interrupts and low-latency peripheral response. Its clock system combines internal oscillators-including a factory-trimmed 48 MHz HSI48 for USB synchronization-and dual PLL paths enabling precise USB frame timing and independent peripheral clock domains.

Power architecture includes separate VDDA (2.4–3.6 V) for analog peripherals, programmable voltage detector (PVD), and three low-power modes (Sleep/Stop/Standby) with RTC and backup register retention under VBAT. The 12-bit ADC features hardware-calibrated offset and linearity, with dedicated analog supply and temperature sensor/VREFINT channels.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant ECOPACK®2 construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F042K6T6TR, STM32F072CBT6 trades CAN for enhanced audio and analog capability, while STM32F042F6P6 sacrifices USB/CAN and I/O count for ultra-compact packaging-making the K6T6TR optimal for USB+CAN edge nodes needing ≥32 GPIOs in LQFP48.

Availability

STM32F042K6T6TR is available at Aetrix Electronics and suitable for industrial sensor nodes, USB human interface devices, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and ECOPACK®2 compliance.

Supply support for STM32F042K6T6TR 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 ICs, sensors, and analog products for industrial, automotive, and consumer markets.

This part belongs to the STM32F0 mainstream Arm Cortex-M0 series, engineered for cost-sensitive, low-power embedded applications demanding rich peripheral integration-including USB, CAN, and capacitive touch-in compact packages.

FAQ

Does STM32F042K6T6TR support USB device mode without an external crystal?

Yes. It integrates a factory-trimmed 48 MHz HSI48 oscillator with automatic calibration against USB Start-of-Frame (SOF) tokens, meeting USB 2.0 Full-Speed timing requirements (±0.25% accuracy) without external crystal or oscillator. This is confirmed in Section 3.19 and Table 40 of the official datasheet (DocID025832 Rev 5).

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

The STM32F042K6T6TR supports up to 24 5 V-tolerant I/Os across GPIO ports A, B, and F. These pins tolerate 5 V inputs while operating from a 3.3 V supply, enabling direct interfacing with legacy 5 V logic families. Pin-specific tolerance is documented in Table 13 (Pin Definitions) and Section 6.3.14 (I/O port characteristics).

Can the internal temperature sensor be used for system-level thermal monitoring?

Yes. The integrated temperature sensor provides calibrated output (±1.5°C accuracy over 0–85°C) referenced to VDDA, with dedicated ADC channel (ADC1_IN16). Calibration values are stored in system memory (0x1FFFF7B8), allowing software compensation. This is specified in Section 3.10.1 and Table 57 of the datasheet.

Is the CAN controller compatible with ISO 11898-1 (CAN 2.0B) physical layer?

No-the CAN controller is a protocol-layer IP block only. It requires an external CAN transceiver (e.g., TJA1042, SN65HVD230) for physical layer compliance with ISO 11898-1. PB8 (CAN_RX) and PB9 (CAN_TX) are TTL-level signals; the datasheet explicitly states "external transceiver required" in Section 3.18 and Figure 1 (Block Diagram).