STMicroelectronics STM32F091CBT6TR

Overview

STM32F091CBT6TR from STMicroelectronics is a 32-bit ARM Cortex-M0 microcontroller with 128 KB Flash, 32 KB SRAM, integrated CAN 2.0B interface, dual 12-bit DAC, 12-bit ADC (16-channel, 1.0 µs conversion), and up to 88 I/Os-including 69 with 5V tolerance-designed for industrial control nodes requiring real-time communication, analog signal conditioning, and low-power operation in 2.0–3.6 V systems.

For engineers reviewing the STM32F091CBT6TR datasheet, STM32F091CBT6TR pinout, STM32F091CBT6TR application, or STM32F091CBT6TR equivalent, key selection considerations include CAN bus integration, dual DAC support for precision actuator control, 5V-tolerant GPIOs for legacy interface compatibility, and hardware CRC/RTC/CEC features for embedded automation and HMI systems.

Technical Context

The device implements a single-cycle ARM Cortex-M0 core running at up to 48 MHz, paired with a multi-source clock system including 4–32 MHz external crystal, 32 kHz RTC oscillator, 8 MHz internal RC with PLL, and a factory-trimmed 48 MHz internal oscillator synchronized via external reference. Memory subsystem includes Flash with ECC protection and SRAM with hardware parity checking.

Peripheral architecture integrates a 12-channel DMA controller, advanced-control timer (TIM1) supporting 6-channel complementary PWM with dead-time insertion, seven general-purpose timers, two watchdogs (IWDG/WWDG), and full-duplex USARTs with ISO7816, LIN, IrDA, and auto-baud detection-enabling robust fieldbus node design without external timing or protocol assist chips.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F072CBT6, the STM32F091CBT6TR adds essential CAN 2.0B and dual DAC for industrial fieldbus nodes; versus STM32F303CBT6, it trades FPU and op-amps for lower static current and tighter integration of CAN+CEC+TSC-making it optimal for cost-sensitive, low-power, communication-centric embedded controllers.

Availability

STM32F091CBT6TR is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, smart metering, and HMI touch panel applications requiring stable component supply across long production lifecycles.

Supply support for STM32F091CBT6TR 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, delivering silicon solutions for automotive, industrial, and consumer markets with emphasis on reliability, longevity, and ecosystem support.

The STM32F0 series targets cost-sensitive, low-power embedded applications requiring ARM Cortex-M0 performance, rich analog integration, and industrial-grade peripherals-optimized for programmable logic controllers, sensor nodes, and human-machine interfaces.

FAQ

What is the maximum operating frequency and supported voltage range?

The STM32F091CBT6TR operates at up to 48 MHz using its internal 48 MHz oscillator or external crystal. It supports a supply voltage range of 2.0 V to 3.6 V for digital I/O and core logic, with analog supply (VDDA) matching VDD up to 3.6 V. The device guarantees full functionality across this range, including ADC accuracy and DAC linearity, as verified in ST's production characterization data (DocID026284 Rev 4, Section 6.3.1).

Does this MCU support CAN FD or only classical CAN 2.0B?

The STM32F091CBT6TR implements only classical CAN 2.0B (ISO 11898-1), supporting bit rates up to 1 Mbit/s and 29-bit extended identifiers. It does not support CAN FD features such as flexible data-rate switching or increased payload size. This is confirmed in the functional overview (Section 3.20) and electrical characteristics (Section 6.3.22) of the official datasheet.

How many 5V-tolerant I/O pins does the LQFP64 package provide?

The STM32F091CBT6TR in LQFP64 configuration provides 69 5V-tolerant I/O pins across GPIO ports A through F. These pins accept input voltages up to 5.5 V regardless of VDD level (2.0–3.6 V), enabling direct interfacing with legacy 5V peripherals without external level shifters-documented in Section 3.7 and Table 13 of the datasheet.

Is the internal 48 MHz oscillator factory-trimmed and usable as system clock source?

Yes-the internal 48 MHz HSI48 oscillator is factory-trimmed to ±2% accuracy and fully qualified as a system clock source. It supports automatic synchronization with external USB SOF or other periodic signals via the Clock Recovery System (CRS), making it suitable for USB device applications without an external crystal-detailed in Sections 3.6 and 6.3.8 of the datasheet.