STMicroelectronics STM32F051R8H6

Overview

STM32F051R8H6 from STMicroelectronics is a 32-bit ARM Cortex-M0 microcontroller in LQFP64 package, featuring 64 KB Flash, 8 KB SRAM with hardware parity, 48 MHz max CPU frequency, one 12-bit ADC (16-channel, 1.0 µs conversion), and one 12-bit DAC - deployed in industrial motor control interfaces requiring real-time PWM generation, analog sensing, and serial communication.

For engineers reviewing the STM32F051R8H6 datasheet, STM32F051R8H6 pinout, STM32F051R8H6 application, or STM32F051R8H6 equivalent, key selection criteria include its 64-pin LQFP package with 55 fast I/Os (36 5V-tolerant), integrated RTC with alarm/wakeup, dual USARTs (one with LIN/IrDA/ISO7816), and advanced-control timer (TIM1) supporting 6-channel PWM with deadtime and emergency stop.

Technical Context

The STM32F051R8H6 implements an ARM Cortex-M0 core with Harvard architecture, supporting Thumb-2 instruction set and NVIC for deterministic interrupt handling up to 32 priority levels. Its memory subsystem includes 64 KB of single-cycle Flash with prefetch buffer and 8 KB SRAM with hardware parity checking for fault detection in safety-critical contexts.

Clock management integrates multiple sources: 4–32 MHz external crystal oscillator, 32 kHz LSE for RTC calibration, 8 MHz HSI RC with x6 PLL for system clock, and 40 kHz LSI for watchdog and Stop-mode wakeup. Power management supports Sleep, Stop, and Standby modes with VBAT backup for RTC and registers.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad - optimized for industrial PCB layouts requiring mechanical robustness and thermal dissipation under continuous 48 MHz operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F051R8H6, the STM32F072RBT6 adds USB but removes DAC and CEC - trading analog interface flexibility for connectivity; the STM32G031K8U6 offers modern security and lower active power but omits touch and consumer electronics control features essential for HMI and remote-controlled systems.

Availability

STM32F051R8H6 is available at Aetrix Electronics and suitable for industrial motor control interfaces, smart sensor nodes, energy monitoring modules, and industrial HMI panels requiring stable component supply across extended production lifecycles.

Supply support for STM32F051R8H6 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, designing and manufacturing microcontrollers, power management ICs, MEMS, and analog components for industrial, automotive, and consumer markets.

The STM32F0 series targets cost-sensitive, resource-constrained embedded applications requiring ARM Cortex-M0 performance with rich analog integration - optimized for motor control, sensing, and human-machine interface subsystems.

FAQ

What is the maximum operating frequency and corresponding supply voltage range?

The STM32F051R8H6 operates at up to 48 MHz across its full VDD range of 2.0–3.6 V. At 48 MHz, the minimum recommended VDD is 2.4 V per electrical characteristics (Section 6.3.1). Below 2.4 V, maximum frequency is derated per the datasheet's VDD/f_CPU curve - e.g., 32 MHz at 2.0 V. All timing parameters assume VDD ≥ 2.4 V for full-speed operation.

Does this MCU support hardware CRC calculation, and how is it implemented?

Yes, the STM32F051R8H6 includes a dedicated CRC calculation unit compliant with IEEE 802.3 (32-bit polynomial 0x04C11DB7). It operates independently of the CPU, accepts byte/word data via APB bus, and supports both full and partial CRC computation. The unit is initialized via CRC_INIT register and updated via CRC_DR; no software polynomial loop is required, reducing firmware overhead in firmware update validation and communication frame checksumming.

How many 5 V-tolerant I/Os does the LQFP64 package provide, and which ports are they on?

The STM32F051R8H6 in LQFP64 provides exactly 36 5 V-tolerant I/Os. These are located on GPIO ports A (PA0–PA7), B (PB0–PB15), and C (PC0–PC15), excluding PC13–PC15 (RTC-related, not 5 V tolerant). Tolerance applies only when VDD is powered (≥ 2.0 V); pins remain functional at 5 V input even if VDD = 3.3 V, enabling direct interfacing with 5 V sensors, logic, and legacy peripherals without external level shifters.

Can the internal 12-bit DAC drive a load directly, and what are its output limitations?

The integrated 12-bit DAC channel supports rail-to-rail output (0–VREF+) with typical settling time of 6 µs and monotonicity guaranteed. It can drive resistive loads down to 5 kΩ directly; for lower-impedance or capacitive loads (e.g., op-amp inputs), an external buffer is required to maintain linearity and stability. Output voltage range is limited by VREF+ (typically VDDA), and DAC output is disabled in Stop/Standby modes unless configured for low-power retention.