STMicroelectronics STM32F042K6T7

Overview

STM32F042K6T7 from STMicroelectronics is a 32-bit ARM Cortex-M0 microcontroller with 32 KB Flash, 6 KB SRAM, crystal-less USB 2.0 FS interface, CAN 2.0B controller, and 12-bit ADC (1.0 µs conversion). It operates from 2.0–3.6 V, supports up to 48 MHz CPU frequency, and integrates RTC with alarm, nine timers (including advanced-control TIM1), and capacitive touch sensing-used in industrial sensor nodes requiring embedded USB-CDC communication and low-power CAN bus interfacing.

For engineers reviewing the STM32F042K6T7 datasheet, STM32F042K6T7 pinout, STM32F042K6T7 application, or STM32F042K6T7 equivalent, key selection criteria include USB 2.0 FS operation without external crystal, CAN transceiver integration readiness, 5 V-tolerant I/O count (up to 24), internal 48 MHz oscillator trimming via USB SOF, and ECOPACK®2-compliant UFQFPN32 package thermal performance.

Technical Context

The STM32F042K6T7 implements an ARM Cortex-M0 core with Harvard architecture, supporting Thumb-2 instruction set and NVIC with 32 interrupt lines. Its clock system includes dual oscillators: a factory-trimmed 48 MHz HSI48 for USB synchronization and a 32 kHz LSE for RTC calibration-enabling crystal-less USB operation via Clock Recovery System (CRS) linked to USB Start-of-Frame tokens.

Peripheral integration follows a tightly coupled memory-mapped architecture: DMA controller (5 channels) services ADC, SPI, USART, and USB endpoints; TSC block supports up to 14 capacitive sensing channels using dedicated GPIOs; and the CAN controller complies with ISO 11898-1:2003 with programmable bit timing and 14 message mailboxes.

Key Specifications

Pinout & Package

STM32F042K6T7 is housed in a 32-pin UFQFPN (5 × 5 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per STM32F042x6 device specification and validated against ST's DocID025832 Rev 5 Table 13 (pin definitions) and Table 15 (GPIOB alternate functions).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit ARM Cortex-M0 microcontroller applications.

Compared with STM32F042K6T7, STM32F072CBT6 trades crystal-less convenience for memory scalability, while LPC11U35 sacrifices CAN and TSC for enhanced USB reliability and debug tooling-making STM32F042K6T7 optimal for cost-sensitive, dual-interface (USB+CAN), touch-enabled edge nodes.

Availability

STM32F042K6T7 is available at Aetrix Electronics and suitable for industrial sensor nodes, USB-CDC bridge devices, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and ECOPACK®2 environmental compliance.

Supply support for STM32F042K6T7 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, sensors, and automotive ASICs since 1987.

The STM32F0 series targets cost-sensitive, ultra-low-power embedded applications requiring rich analog integration, USB connectivity, and industrial-grade reliability-optimized for smart sensors, home appliances, and basic motor control.

FAQ

Does STM32F042K6T7 support USB device enumeration without an external crystal?

Yes. The device integrates an HSI48 oscillator with automatic trimming synchronized to USB Start-of-Frame (SOF) tokens, enabling full-speed USB 2.0 device enumeration and data transfer without any external crystal or resonator. This is confirmed in Section 3.19 and Table 40 of DocID025832 Rev 5, with ±0.25% frequency accuracy over temperature and voltage ranges.

What is the maximum number of 5 V-tolerant I/O pins on STM32F042K6T7?

The STM32F042K6T7 provides up to 24 5 V-tolerant I/O pins across GPIO ports A and B, as specified in Section 3.7 and Table 13 of the datasheet. These pins tolerate 5 V input even when VDD = 2.0 V, allowing direct connection to legacy 5 V logic without level shifters-critical for industrial I/O consolidation.

Can the internal capacitive sensing controller (TSC) operate during Stop mode?

No. The TSC requires the APB1 clock and VDDA supply to be active; it cannot function in Stop mode. However, the device supports wakeup from Stop mode via EXTI lines triggered by GPIO change events on TSC-capable pins (e.g., PA0–PA7, PB0–PB1), enabling low-power touch gesture detection with <5 µs latency.

Is the CAN controller compatible with ISO 11898-1:2003 and does it support baud rates up to 1 Mbit/s?

Yes. The integrated CAN controller fully complies with ISO 11898-1:2003 and supports programmable bit timing with sample points adjustable from 50% to 90%. Tested operation at 1 Mbit/s is verified in Section 3.18 and Table 60 of the datasheet, with propagation delay compensation enabled via CAN_BTR register configuration.