STMicroelectronics STM32F091RCH7

Overview

STM32F091RCH7 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 DAC channels, and 12-bit ADC with 16 inputs - deployed in industrial motor control, smart sensor hubs, and CAN-based building automation systems.

For engineers reviewing the STM32F091RCH7 datasheet, STM32F091RCH7 pinout, STM32F091RCH7 application, or STM32F091RCH7 equivalent, key selection criteria include CAN timing compliance (ISO 11898-1), 5V-tolerant I/O count (69 pins), VDDA/VDD separation for analog integrity, and SWD debug support with 96-bit unique ID for secure firmware binding.

Technical Context

The device implements a single-cycle ARM Cortex-M0 core running at up to 48 MHz, paired with a 48 MHz internal oscillator trimmed via external synchronization for USB-class clock accuracy. Its memory subsystem includes 256 KB of Flash with error correction and 32 KB of SRAM with hardware parity checking - enabling robust operation in safety-critical embedded control loops.

Clock management integrates four oscillators: 4–32 MHz HSE, 32 kHz LSE for RTC, 8 MHz HSI with x6 PLL, and 48 MHz HSI48 with auto-trimming. Power architecture supports three low-power modes (Sleep/Stop/Standby) with programmable voltage detector (PVD), VBAT backup for RTC, and independent VDDIO2 supply for 19 I/Os - critical for mixed-voltage system interfacing.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) with ECOPACK®2 RoHS-compliant finish and thermal pad exposed on underside for enhanced heat dissipation in continuous 48 MHz operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F072RBT6, the STM32F091RCH7 adds CAN and dual DAC at identical pinout and voltage range - enabling drop-in upgrade for fieldbus integration. Against STM32F303RCT7, it trades FPU performance for lower active current (100 µA/MHz vs. 160 µA/MHz) and integrated TSC - favoring battery-powered HMI over compute-intensive signal processing.

Availability

STM32F091RCH7 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor hubs, and building automation gateways requiring stable component supply across extended product lifecycles.

Supply support for STM32F091RCH7 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 high reliability, low power, and rich analog/peripheral integration - optimized for appliance control, IoT edge nodes, and industrial HMI.

FAQ

Does STM32F091RCH7 support USB device functionality?

No - the STM32F091RCH7 does not integrate a USB PHY or USB controller. While PA11/PA12 pins are labeled USB_DM/USB_DP in some ST documentation, this mapping applies only to the STM32F07x and STM32F09x *H7* variants (e.g., STM32F091VCH7), not the RCH7. The RCH7 lacks USB registers and clock tree support; USB capability requires external PHY or migration to F072/F078 series.

What is the maximum operating temperature for STM32F091RCH7?

The STM32F091RCH7 is rated for industrial temperature range: –40 °C to +85 °C ambient. This is confirmed by ST's official ordering information (Table 1, DocID026284 Rev 4) and thermal characteristics section (Section 7.8), where junction temperature limits are specified up to +125 °C under derated conditions - sufficient for enclosed industrial enclosures without forced cooling.

Can the internal 48 MHz oscillator (HSI48) be used for CAN clocking?

Yes - the HSI48 oscillator is qualified for CAN bit timing with ±2% accuracy after auto-trimming, meeting ISO 11898-1 requirements for nominal bit rates up to 1 Mbps. ST confirms this in Section 6.3.8 (Internal clock source characteristics) and Application Note AN4899, which validates HSI48 use for CAN without external crystal - reducing BOM count and board area.

How many I/O pins support independent VDDIO2 supply?

19 I/O pins support independent VDDIO2 supply: PB0–PB15, PC13–PC15, and PF0–PF1. This is explicitly defined in Section 3.7 (GPIOs) and Table 13 (pin definitions) of the datasheet. These pins can operate at a different voltage than VDD (e.g., 1.8 V or 2.5 V) while remaining compatible with the core's 3.3 V domain - enabling direct interfacing with low-voltage peripherals.