STMicroelectronics STM32F091RCH6TR

Overview

STM32F091RCH6TR from STMicroelectronics is a 32-bit ARM Cortex-M0 microcontroller in LQFP64 package, featuring 256 KB Flash, 32 KB SRAM with hardware parity, integrated CAN 2.0B interface, dual 12-bit DACs, and 12-bit ADC with 16 channels - deployed in industrial motor control, smart sensor hubs, and CAN-based automotive body electronics.

For engineers reviewing the STM32F091RCH6TR datasheet, STM32F091RCH6TR pinout, STM32F091RCH6TR application, or STM32F091RCH6TR equivalent, key selection criteria include CAN timing compliance, 5V-tolerant I/O count (up to 69 pins), VDDA analog supply range (2.4–3.6 V), and HSI48 oscillator auto-trimming for USB-class clock accuracy without external crystal.

Technical Context

This MCU integrates a single-cycle 48 MHz Cortex-M0 core with tightly coupled NVIC supporting 32 interrupt lines, and features a dual-bank Flash architecture enabling read-while-write operation. Its clock system includes three independent oscillators: 4–32 MHz HSE, 32 kHz LSE for RTC calibration, and factory-trimmed 48 MHz HSI48 with ±2% accuracy over temperature and voltage.

The peripheral set centers on real-time control: one advanced-control timer (TIM1) delivering six complementary PWM outputs with dead-time insertion, two fast low-power comparators with programmable hysteresis, and a capacitive touch sensing controller supporting up to 24 channels - all synchronized via shared APB1/APB2 bus matrix with zero-wait-state access at full speed.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant ECOPACK®2 packaging.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F072RBT6, STM32F091RCH6TR adds essential CAN and dual DAC functionality for distributed control; versus STM32F303RCT6, it achieves identical peripheral coverage at lower static power and reduced code size overhead - ideal for cost- and energy-constrained edge nodes.

Availability

STM32F091RCH6TR is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and smart sensor hub designs requiring stable component supply across multi-year production cycles.

Supply support for STM32F091RCH6TR 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-grade components since 1987.

The STM32F0 series targets cost-sensitive, resource-constrained embedded applications requiring high integration, low power, and industrial temperature grade (–40°C to +85°C) - optimized for appliance control, industrial I/O modules, and basic HMI systems.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM32F091RCH6TR achieves 48 MHz maximum CPU frequency using its internal 48 MHz HSI48 oscillator, which is factory-trimmed and dynamically adjusted via automatic synchronization with an external clock source. No external crystal is required for full-speed operation, though an 8 MHz HSE can be used with PLL multiplication for jitter-sensitive applications.

Does this MCU support USB device functionality?

Yes - the STM32F091RCH6TR includes USB 2.0 Full-Speed (12 Mbps) device capability via dedicated PA11 (DM) and PA12 (DP) pins. It uses the internal HSI48 oscillator with auto-trimming to meet USB timing specifications, eliminating the need for an external 48 MHz crystal or oscillator.

How many I/O pins are 5V-tolerant and what is their voltage rating?

Up to 69 GPIO pins are 5V-tolerant, meaning they safely accept input voltages up to 5.5 V regardless of VDD level (2.0–3.6 V). This allows direct interfacing with legacy 5V logic, sensors, and displays without external level-shifting circuitry - confirmed in Section 6.3.14 of the official datasheet.

What is the role of the VDDA supply and what happens if it's disconnected?

VDDA powers the analog subsystem (ADC, DAC, comparators, reset circuitry) and must be connected within 2.4–3.6 V. If VDDA is unpowered while VDD is active, analog peripherals become nonfunctional and the internal reset generator may fail - potentially causing unpredictable behavior or failure to boot. VDDA must be ramped simultaneously with or before VDD during power-up.