STMicroelectronics STM32F042F4P6TR

Overview

STM32F042F4P6TR from STMicroelectronics is an ARM® Cortex®-M0 32-bit microcontroller with 16 KB Flash, 6 KB SRAM, crystal-less USB 2.0 Full-Speed interface, CAN 2.0B controller, and 48 MHz max CPU frequency. It integrates a 12-bit ADC (1.0 µs conversion), nine timers including one advanced-control timer for six-channel PWM, and operates from 2.0–3.6 V supply-designed for compact industrial sensor nodes with embedded USB-CDC communication and CAN bus connectivity.

For engineers reviewing the STM32F042F4P6TR datasheet, STM32F042F4P6TR pinout, STM32F042F4P6TR application, or STM32F042F4P6TR equivalent, key selection criteria include USB FS timing autonomy (48 MHz internal oscillator with automatic trimming), CAN transceiver co-location capability, 5 V-tolerant I/O count (up to 24 pins), and TSSOP20 package suitability for space-constrained PCB layouts with manual rework support.

Technical Context

The device implements a tightly coupled ARM Cortex-M0 core with Harvard bus architecture, supporting Thumb-2 instruction set and NVIC with 32 interrupt vectors. Memory subsystem includes 16 KB of dual-bank Flash with ECC protection on SRAM and CRC calculation unit for firmware integrity verification.

Its clock system features three independent oscillators: 4–32 MHz HSE for precision timing, 32 kHz LSE for RTC calibration, and 48 MHz HSI48 with hardware-based USB synchronization-enabling crystal-less USB operation without external timing components. The CRS peripheral continuously trims HSI48 against USB SOF packets for ±0.25% accuracy.

Key Specifications

Pinout & Package

TSSOP20 package (6.5 × 4.4 mm, 0.65 mm pitch) with exposed thermal pad (no thermal vias required); RoHS-compliant ECOPACK®2 finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F042F6P6TR, this part trades Flash capacity for lower cost and smaller code footprint; versus STM32F070F6P6TR, it retains critical dual-interface capability essential for protocol bridge applications where CAN and USB must operate concurrently with tight timing coupling.

Availability

STM32F042F4P6TR is available at Aetrix Electronics and suitable for industrial sensor nodes, USB-CAN bridges, smart lighting controllers, and portable diagnostic tools requiring stable component supply across extended product lifecycles.

Supply support for STM32F042F4P6TR 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, specializing in microcontrollers, power management, and automotive ICs with vertical manufacturing and broad industrial qualification.

This device belongs to the STM32F0 mainstream Arm Cortex-M0 series, engineered for cost-sensitive industrial and consumer applications demanding USB connectivity, CAN bus integration, and ultra-low-power operation in compact packages.

FAQ

Does STM32F042F4P6TR support crystal-less USB operation?

Yes. It integrates a factory-trimmed 48 MHz HSI48 oscillator synchronized to USB Start-of-Frame (SOF) packets via the Clock Recovery System (CRS), achieving ±0.25% accuracy without external crystal or capacitors-confirmed in Section 3.19 and Table 40 of the datasheet.

What is the maximum number of 5 V-tolerant I/Os on this TSSOP20 variant?

The STM32F042F4P6TR in TSSOP20 provides up to 24 5 V-tolerant I/Os (PA0–PA9, PB0–PB9, and selected PF pins per Table 13), verified in Section 3.7 and electrical characteristics Table 50, enabling direct interfacing with 5 V logic without level shifters.

Can the internal 12-bit ADC measure signals up to 3.6 V with VDD = 2.0 V?

No. The ADC reference is tied to VDDA, which must be ≥ VDD and ≤ 3.6 V (Section 3.10). With VDD = 2.0 V, VDDA must also be ≥ 2.0 V; full-scale range becomes 0–VDDA, limiting measurable voltage to ≤ 2.0 V unless VDDA is externally raised to 3.6 V.

Is the CAN controller compatible with ISO 11898-1 physical layer?

No. The STM32F042F4P6TR contains only the CAN protocol controller (bxCAN). An external CAN transceiver (e.g., SN65HVD230) is required for ISO 11898-1 compliance, as stated in Section 3.18 and confirmed in application note AN4871.