STMicroelectronics STM32F051R8H7TR

Overview

STM32F051R8H7TR from STMicroelectronics is a 32-bit ARM® Cortex®-M0 microcontroller in LQFP64 package, featuring 64 KB Flash, 8 KB SRAM with hardware parity, and operating at up to 48 MHz. It integrates one 12-bit ADC (1.0 µs conversion), one 12-bit DAC, two analog comparators, 11 timers (including advanced-control TIM1 with deadtime and emergency stop), RTC with alarm, and communication interfaces including two I²C (one Fast Mode Plus), two USART (one with ISO7816/LIN/IrDA), and two SPI (18 Mbit/s). It targets cost-sensitive industrial control and sensor node applications requiring low-power operation and analog integration.

For engineers reviewing the STM32F051R8H7TR datasheet, STM32F051R8H7TR pinout, STM32F051R8H7TR application, or STM32F051R8H7TR equivalent, key selection considerations include its 64-pin LQFP package with 55 fast I/Os (36 × 5 V tolerant), 2.0–3.6 V supply range, integrated capacitive touch sensing (up to 18 channels), SWD debug interface, and support for Stop/Standby low-power modes with RTC wakeup.

Technical Context

The device implements an ARM Cortex-M0 core with Harvard architecture, supporting Thumb-2 instruction set and nested vectored interrupt controller (NVIC) for deterministic real-time response. Memory subsystem includes 64 KB on-chip Flash with error correction and 8 KB SRAM with hardware parity checking-enabling robust operation in industrial environments.

Clock system combines multiple sources: 4–32 MHz external crystal oscillator, 32 kHz LSE for RTC, internal 8 MHz RC with x6 PLL for system clock, and 40 kHz LSI for watchdogs. Power management supports POR/PDR, programmable voltage detector (PVD), and three low-power modes (Sleep, Stop, Standby) with VBAT backup for RTC and registers.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 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 STM32F030F4P6, the STM32F051R8H7TR adds DAC, touch sensing, and richer timer/peripheral set for analog-rich control; versus STM32F072RBT6, it trades USB and extra Flash for lower cost and identical package footprint where USB is unused.

Availability

STM32F051R8H7TR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart HVAC controllers, programmable logic relays, and energy meter front-ends requiring stable component supply across multi-year production cycles.

Supply support for STM32F051R8H7TR 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 devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM32F0 series delivers entry-level Cortex-M0 performance with analog integration and low-power features optimized for cost-sensitive industrial control, home appliances, and IoT edge nodes.

FAQ

What is the maximum operating frequency and supported clock sources?

The STM32F051R8H7TR operates at up to 48 MHz using its internal 8 MHz RC oscillator with x6 PLL, or from external sources including 4–32 MHz HSE crystal or 32.768 kHz LSE for RTC. The HSI RC oscillator is factory-trimmed to ±1% accuracy, and the PLL supports integer multiplication only-no fractional division. All clock trees are managed by the RCC peripheral with fail-safe clock security system.

Does this MCU support hardware CRC calculation and memory parity?

Yes. It includes a dedicated CRC calculation unit supporting 32-bit polynomial (default 0x04C11DB7) for firmware image integrity checks, and its 8 KB SRAM implements hardware parity checking-triggering a HardFault on parity error. Flash memory does not include ECC, but CRC can be applied to stored data blocks during runtime. Parity errors are reported via the PFSR (Parity Flag Status Register) and generate a BusFault exception.

How many I/O pins are 5 V tolerant, and what is the absolute maximum rating?

Exactly 36 GPIO pins (PA0–PA15, PB0–PB15, PC13–PC15) are 5 V tolerant when configured as inputs or outputs in push-pull mode. Absolute maximum rating for these pins is –0.3 V to 5.5 V, regardless of VDD level. This tolerance is not applicable to analog pins (e.g., ADC inputs), which must remain within VSSA to VDDA. No external clamping diodes are required for interfacing with 5 V logic.

What debug interface is supported, and are SWD pins shared with other functions?

The device supports Serial Wire Debug (SWD) only-no JTAG. SWDIO (PA13) and SWCLK (PA14) are dedicated debug pins with no alternate functions; they cannot be remapped. These pins are active after reset and remain functional even in low-power Stop mode if debug is enabled. SWO (serial wire output) is not available on this part-trace functionality is not implemented. Debug authentication and secure access are not supported in the F0 series.