STMicroelectronics STM32F042G6U6TR

Overview

STM32F042G6U6TR from STMicroelectronics is a 32-bit ARM Cortex-M0 microcontroller with 32 KB Flash, 6 KB SRAM, crystal-less USB 2.0 FS, CAN 2.0B interface, 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. Used in industrial sensor nodes requiring embedded USB-CDC communication and CAN bus interfacing.

For engineers reviewing the STM32F042G6U6TR datasheet, STM32F042G6U6TR pinout, STM32F042G6U6TR application, or STM32F042G6U6TR equivalent, key selection criteria include USB clocking autonomy (48 MHz internal oscillator with trimming), 5 V-tolerant I/O count (up to 24 pins), CAN+USB dual-protocol support, and capacitive touch sensing capability (up to 14 channels).

Technical Context

The device implements a tightly coupled ARM Cortex-M0 core with Harvard architecture, supporting Thumb-2 instruction set and NVIC with 32 interrupt lines. Memory subsystem includes 32 KB on-chip Flash with error correction (ECC) and 6 KB SRAM with hardware parity checking - both mapped into unified address space with configurable wait states.

Clock system features four independent oscillators: 4–32 MHz HSE, 32 kHz LSE for RTC, 8 MHz HSI with PLL multiplier, and dedicated 48 MHz HSI48 oscillator trimmed via USB SOF synchronization - enabling full-speed USB operation without external crystal. Power management supports Sleep, Stop, and Standby modes with VBAT-backed RTC and backup registers.

Key Specifications

Pinout & Package

STM32F042G6U6TR uses UFQFPN48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are multiplexed across five GPIO ports (A–F), supporting up to 38 fast I/Os with configurable pull-up/pull-down and alternate function remapping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F042G6U6TR, STM32F072CBT6 offers more memory but sacrifices crystal-less USB convenience, while STM32G031K8T6 trades CAN for security extensions - making the F042 optimal for cost-sensitive, dual-protocol (CAN+USB) embedded nodes where compactness and BOM reduction are critical.

Availability

STM32F042G6U6TR is available at Aetrix Electronics and suitable for industrial sensor nodes, USB-CDC gateways, motor control modules, and smart lighting controllers requiring stable component supply across multi-year production cycles.

Supply support for STM32F042G6U6TR 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 analog components for industrial, automotive, and consumer markets.

The STM32F0 series targets cost-sensitive, resource-constrained embedded applications requiring ARM Cortex-M0 performance, integrated peripherals, and industrial-grade reliability - with emphasis on USB connectivity, analog integration, and low-power operation.

FAQ

Does STM32F042G6U6TR support USB device mode without an external crystal?

Yes. It integrates a factory-trimmed 48 MHz HSI48 oscillator synchronized to USB Start-of-Frame (SOF) tokens, enabling full-speed USB device operation without external crystal or clock source - confirmed in Section 3.19 and Table 40 of the datasheet.

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

The STM32F042G6U6TR supports up to 24 I/O pins with 5 V tolerance, as specified in Section 3.7 of the datasheet. These pins are distributed across GPIO ports A, B, and C, and tolerate 5 V inputs even when VDD is as low as 2.0 V.

Can the internal RTC operate during Stop mode with VBAT supplied?

Yes. The calendar RTC retains timekeeping, alarm, and periodic wakeup functionality in Stop mode when powered by VBAT (1.8–3.6 V), as documented in Section 3.13 and electrical characteristics Table 58. Backup registers also retain data under VBAT.

Is CAN FD supported on this microcontroller?

No. The STM32F042G6U6TR implements only classical CAN 2.0B (ISO 11898-1) at up to 1 Mbit/s, as stated in Section 3.18. It lacks CAN FD features such as flexible data-rate, extended data length, and CRC enhancements.