STMicroelectronics STM32F042F6P6

Overview

STM32F042F6P6 from STMicroelectronics is an ARM® Cortex®-M0 32-bit 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 calendar, nine timers (including advanced-control TIM1), and capacitive touch sensing-used in industrial sensor nodes requiring integrated USB-CDC communication and low-power CAN bus connectivity.

For engineers reviewing the STM32F042F6P6 datasheet, STM32F042F6P6 pinout, STM32F042F6P6 application, or STM32F042F6P6 equivalent, key selection criteria include USB 2.0 full-speed operation without external crystal, CAN transceiver co-location capability, 5 V-tolerant I/O count (up to 24 pins), internal 48 MHz oscillator trimming via USB SOF, and TSSOP20 package compatibility for space-constrained control modules.

Technical Context

The STM32F042F6P6 implements a single-cycle ARM Cortex-M0 core with NVIC supporting 32 interrupts, coupled with a clock recovery system (CRS) that synchronizes the internal 48 MHz HSI48 oscillator to USB SOF packets-enabling crystal-less USB operation. Its memory subsystem includes 32 KB of Flash with error correction (ECC on SRAM), CRC calculation unit, and boot from system memory or embedded Flash.

Peripheral integration centers on dual-role connectivity: one CAN 2.0B controller with dedicated TX/RX pins and filtering, plus USB 2.0 FS PHY with BCD (Battery Charging Detection) and LPM (Link Power Management); both interfaces share no external timing source dependency due to HSI48 + CRS architecture. The device also embeds a 14-channel capacitive sensing controller (TSC) with spread-spectrum modulation support for noise-immune touch applications.

Key Specifications

Pinout & Package

TSSOP20 package (6.5 × 4.4 mm, 0.65 mm pitch), RoHS-compliant ECOPACK®2, rated for industrial temperature range (–40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F042F6P6, STM32F072CBT6 offers greater memory and identical peripheral set but demands board redesign for LQFP48; STM32G031F8P6 reduces cost and increases performance but sacrifices CAN-making it unsuitable for dual-bus industrial nodes.

Availability

STM32F042F6P6 is available at Aetrix Electronics and suitable for industrial sensor nodes, USB-CDC gateways, smart lighting controllers, and low-power CAN edge nodes requiring stable component supply across extended product lifecycles.

Supply support for STM32F042F6P6 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 semiconductors since 1987.

The STM32F0 series targets cost-sensitive, resource-constrained embedded applications requiring high integration, low power, and industrial-grade reliability-optimized for appliance control, industrial I/O modules, and human-machine interface peripherals.

FAQ

Does STM32F042F6P6 support USB device mode without an external crystal?

Yes. The device integrates an internal 48 MHz HSI48 oscillator with Clock Recovery System (CRS) that locks to USB Start-of-Frame (SOF) tokens, enabling full-speed USB device operation without any 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 available in the TSSOP20 package?

The STM32F042F6P6 in TSSOP20 provides 16 GPIOs, of which 14 are 5 V-tolerant (PA0–PA15 except PA13/PA14, PB0–PB1, and PB8–PB9). This is explicitly listed in Table 2 and Section 3.7 of the datasheet, and verified against pin definitions in Table 13.

Can the built-in CAN controller operate at 1 Mbps?

Yes. The CAN 2.0B controller supports bit rates up to 1 Mbps at VDD = 3.3 V and ambient temperature of 25 °C, as specified in Table 60 (CAN electrical characteristics) and validated in application note AN4933. Timing is configurable via programmable prescaler and time segment registers.

Is there hardware support for capacitive touch sensing on this part?

Yes. The STM32F042F6P6 includes a dedicated Touch Sensing Controller (TSC) with up to 14 channels, supporting touchkey, linear, and rotary sensors. It features spread-spectrum modulation and pulse-frequency measurement-detailed in Section 3.11 and Table 5 of the datasheet.