STMicroelectronics NUCLEO-F091RC

Overview

NUCLEO-F091RC from STMicroelectronics is a 64-pin STM32 Nucleo-64 development board built around the STM32F091RCT6 Arm® Cortex®-M0 MCU (256 KB Flash, 32 KB SRAM), featuring ST-LINK/V2-1 debugger/programmer via USB Mini-B, ARDUINO® Uno V3 and ST morpho expansion headers, and a 32.768 kHz crystal oscillator for real-time clock applications in embedded prototyping.

For engineers reviewing the NUCLEO-F091RC datasheet, NUCLEO-F091RC pinout, NUCLEO-F091RC application, or NUCLEO-F091RC equivalent, this board supports rapid evaluation of low-power industrial control, sensor interface, and USB-capable firmware development with full I/O access, free STM32Cube software libraries, and IDE compatibility including STM32CubeIDE, IAR EWARM, and Keil MDK-ARM.

Technical Context

The NUCLEO-F091RC implements an integrated ST-LINK/V2-1 debug probe supporting mass storage, Virtual COM port, and SWD debugging - eliminating need for external programmers. Its target MCU delivers 48 MHz max CPU frequency, operates across -40°C to +85°C, and integrates peripherals including 12-bit ADC, two 12-bit DACs, four general-purpose timers, and one advanced-control timer.

Power architecture includes flexible sourcing from ST-LINK USB VBUS or external 5 V/3.3 V supplies, with on-board voltage regulation for core and I/O domains. The board's dual push-buttons (user and reset) and shared user LED enable immediate firmware interaction without additional hardware.

Key Specifications

Availability

NUCLEO-F091RC is available at Aetrix Electronics and suitable for industrial sensor nodes, motor control proof-of-concept builds, and USB peripheral firmware validation requiring stable component supply and rapid time-to-test.

Supply support for NUCLEO-F091RC 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 automotive, industrial, and consumer markets.

The STM32 Nucleo series was developed to lower barriers to entry for Arm-based embedded development, delivering standardized, open-hardware evaluation platforms with unified software tooling and community-supported shield ecosystems.

FAQ

Does the NUCLEO-F091RC include an external high-speed crystal oscillator?

No. Unlike some other NUCLEO boards (e.g., NUCLEO-F411RE), the NUCLEO-F091RC does not populate a 48 MHz or 24 MHz HSE crystal. It relies on the STM32F091RCT6's internal 8 MHz RC oscillator for system clock, though the HSE pins are accessible via morpho headers for external implementation if required.

Can the NUCLEO-F091RC be used for USB device development?

No - the STM32F091RCT6 MCU lacks native USB PHY hardware, and the NUCLEO-F091RC board does not include USB device circuitry (e.g., pull-up resistors, D+/D− routing, or USB connector). It supports only ST-LINK USB communication, not user-facing USB device functionality.

What IDEs and toolchains are officially supported?

STMicroelectronics officially supports STM32CubeIDE (free, cross-platform), IAR Embedded Workbench® for Arm (Windows-only license required), and Keil MDK-ARM (with free version for Cortex-M0/M0+ cores). All integrate directly with the on-board ST-LINK/V2-1 interface without driver modification.

Is the NUCLEO-F091RC compatible with Arduino shields?

Yes - it features a fully compliant ARDUINO® Uno V3 expansion connector (digital pins D0–D13, analog pins A0–A5, power rails), enabling direct use of standard Uno-form-factor shields. Pin mappings follow STM32Cube HAL conventions and are documented in UM1724 (NUCLEO-F091RC User Manual).