STMicroelectronics STM32091C-EVAL

Overview

STM32091C-EVAL from STMicroelectronics is an evaluation board built around the STM32F091VCT6 ARM® Cortex®-M0 microcontroller (256KB Flash, 32KB SRAM, 8× USART, 2× SPI, 2× I²C, 1× CAN 2.0A/B, 12-bit ADC/DAC, touch sensing) for rapid prototyping of embedded control, human interface, and connectivity applications.

For engineers reviewing the STM32091C-EVAL datasheet, STM32091C-EVAL pinout, STM32091C-EVAL application, or STM32091C-EVAL equivalent, this board supports full peripheral validation-including TFT LCD (240×320), stereo audio I/O, MicroSD, HDMI CEC/DDC, smart card, RS232/RS485, IrDA, IR transceiver, temperature sensor, RF EEPROM, and SWD debugging via integrated ST-LINK/V2-1.

Technical Context

The board implements a complete hardware reference design for the STM32F091VCT6 MCU, exposing all major peripherals through dedicated circuits and standardized connectors. It integrates dual power domains (fixed 3.3 V and adjustable 1.65–3.6 V), RTC with backup battery, and configurable voltage selection for low-power mode testing.

Peripheral interfaces are electrically isolated where appropriate: RS485 uses half-duplex differential transceivers; CAN employs ISO 11898-compliant PHY; HDMI connectors include DDC (I²C-based display data channel) and CEC (consumer electronics control) lines; and the smart card slot complies with ISO/IEC 7816-3 electrical signaling.

Key Specifications

Availability

STM32091C-EVAL is available at Aetrix Electronics and suitable for embedded development, industrial HMI prototyping, and educational MCU labs requiring stable component supply and full peripheral access.

Supply support for STM32091C-EVAL 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, analog ICs, power devices, and sensors for industrial, automotive, and consumer markets.

This evaluation board belongs to ST's STM32 Discovery and Evaluation platform family, engineered to accelerate firmware development, peripheral validation, and system-level integration for Cortex-M0-based applications.

FAQ

Does STM32091C-EVAL support external debug probes besides ST-LINK/V2-1?

Yes - the board provides standard SWD headers compatible with third-party debuggers such as J-Link and CMSIS-DAP adapters. The SWDIO and SWCLK pins are accessible on the extension connector, enabling use of external tools without modifying the onboard ST-LINK/V2-1 circuitry.

Can the STM32F091VCT6 on the board be replaced with another MCU package?

No - the STM32F091VCT6 is soldered in a TFBGA100 package and not socketed. Replacement requires rework equipment and is not supported by ST. The board is intended for evaluation of the specific VCT6 variant, including its pinout, peripheral mapping, and power characteristics.

Is the HDMI CEC functionality fully implemented and tested?

Yes - both HDMI connectors include functional CEC lines routed to dedicated GPIOs of the STM32F091VCT6, with firmware examples provided in ST's STM32CubeF0 package. CEC message transmission and reception have been validated per IEC 62132-1 and IEC 62132-2 standards using compliant test equipment.

What is the maximum operating voltage range for the adjustable MCU supply?

The adjustable MCU supply is configurable from 1.65 V to 3.6 V using an onboard potentiometer and voltage regulator circuit. Operation outside this range may damage the STM32F091VCT6 or cause undefined behavior; ST specifies 1.65–3.6 V as the absolute maximum VDD rating per datasheet DS10445.