STMicroelectronics STM32F091CBT7TR

Overview

STM32F091CBT7TR 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, and 12-bit ADC (1.0 µs conversion). It operates from 2.0–3.6 V and supports industrial motor control, smart sensor nodes, and CAN-based automotive body electronics.

For engineers reviewing the STM32F091CBT7TR datasheet, STM32F091CBT7TR pinout, STM32F091CBT7TR application, or STM32F091CBT7TR equivalent, key selection criteria include CAN transceiver integration readiness, 5V-tolerant I/O count (up to 69 pins), RTC with calibration, and SWD debug support - all verified in ST's DocID026284 Rev 4.

Technical Context

The device integrates an ARM Cortex-M0 core running at up to 48 MHz, paired with a 48 MHz internal oscillator trimmed via external synchronization. Its clock system includes dual oscillators (4–32 MHz HSE + 32 kHz LSE), PLL for frequency multiplication, and independent 40 kHz/8 MHz RC sources - enabling precise timing for CAN bit timing and real-time control loops.

Power architecture features programmable voltage detector (PVD), hardware parity on SRAM, VBAT backup for RTC and registers, and three low-power modes (Sleep, Stop, Standby) with sub-µA standby current. The 12-channel DMA controller offloads CPU during high-throughput peripheral transfers (e.g., ADC→RAM, SPI→DAC).

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), RoHS-compliant and ECOPACK®2 certified. Pinout validated per ST Microelectronics datasheet DocID026284 Rev 4, Section 4 (Pinouts and pin descriptions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F091CBT7TR, STM32F072CBT6 lacks CAN but adds USB; STM32F098RBT6 retains CAN while adding USB and uses LQFP64 - making it unsuitable for space-constrained LQFP48 layouts.

Availability

STM32F091CBT7TR is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and smart sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for STM32F091CBT7TR 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, and MEMS sensors for industrial, automotive, and consumer markets.

The STM32F0 series targets cost-sensitive, resource-efficient embedded applications requiring ARM Cortex-M0 performance, rich analog peripherals, and robust industrial qualification - especially where CAN, RTC, and capacitive touch are essential.

FAQ

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

The STM32F091CBT7TR achieves 48 MHz using its internal 48 MHz HSI48 oscillator, automatically trimmed via external synchronization (e.g., USB SOF or LSE). Alternatively, the PLL can multiply the 8 MHz HSI or external crystal to reach 48 MHz. All configurations are validated per ST's electrical characteristics table (Section 6.3.8).

Does this MCU support hardware CRC calculation?

Yes - it includes a dedicated CRC calculation unit compliant with IEEE-802.3 (32-bit polynomial 0x04C11DB7). It accelerates firmware integrity checks and communication frame validation without CPU overhead, with throughput up to 1 byte/cycle as confirmed in Section 3.4 of the datasheet.

Can the 12-bit DAC outputs drive external loads directly?

The two DAC outputs (PA4/PA5) are buffered and specified to drive ≥5 kΩ loads with monotonicity maintained. For lower-impedance loads (e.g., <1 kΩ), an external op-amp buffer is required to maintain linearity and settling time - per DAC electrical specs in Table 60 (Section 6.3.17).

What debug interface does STM32F091CBT7TR use and what pins are required?

It uses Serial Wire Debug (SWD), requiring only two pins: SWCLK (PA14) and SWDIO (PA13). No NRST pin is mandatory for basic debug, though it improves reliability during firmware update. SWD is supported by all major IDEs (STM32CubeIDE, Keil, IAR) and ST-LINK programmers.