STMicroelectronics STM32F091CCU7TR

Overview

STM32F091CCU7TR from STMicroelectronics is a 32-bit ARM Cortex-M0 microcontroller in UFQFPN48 package, featuring 256 KB Flash, 32 KB SRAM with hardware parity, integrated CAN 2.0B interface, dual 12-bit DAC, and 12-bit ADC with 16 channels - deployed in industrial motor control systems requiring real-time CAN communication and analog signal conditioning.

For engineers reviewing the STM32F091CCU7TR datasheet, STM32F091CCU7TR pinout, STM32F091CCU7TR application, or STM32F091CCU7TR equivalent, key selection criteria include its 48 MHz max CPU frequency, 5V-tolerant I/Os (up to 69 pins), embedded RTC with calibration, HDMI CEC wakeup capability, and support for up to 24 capacitive sensing channels in touch HMI designs.

Technical Context

This MCU integrates a single-cycle ARM Cortex-M0 core with Harvard architecture, supporting Thumb-2 instruction set and delivering 48 DMIPS at 48 MHz. It implements a multi-source clock system including internal 48 MHz oscillator with automatic trimming, 32 kHz RTC crystal oscillator, and PLL-based frequency multiplication from 4–32 MHz external crystals.

The peripheral subsystem includes two I²C interfaces (one with SMBus/PMBus support), eight USARTs (three with ISO7816/LIN/IrDA), two SPI/I²S modules, and a dedicated advanced-control timer (TIM1) for 6-channel complementary PWM generation - all accessible via fully remappable GPIOs with interrupt capability on every pin.

Key Specifications

Pinout & Package

STM32F091CCU7TR uses the UFQFPN48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad, compliant with ECOPACK®2 environmental standards. Pin assignments are validated per STMicroelectronics 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 STM32F072CBT6, STM32F091CCU7TR adds CAN, extra DAC channel, and 24-channel TSC - critical for distributed control and touch UIs; versus STM32F303CBT6, it trades FPU and higher ADC speed for CAN integration and lower power consumption in Stop mode (0.35 µA vs 1.3 µA).

Availability

STM32F091CCU7TR is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, human-machine interface (HMI), and building automation nodes requiring stable component supply across extended product lifecycles.

Supply support for STM32F091CCU7TR 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, MEMS sensors, and automotive-grade components since 1987.

The STM32F0-series targets cost-sensitive, ultra-low-power embedded applications requiring ARM Cortex-M0 performance with rich analog and communication peripherals - optimized for industrial control, appliance, and IoT edge nodes.

FAQ

Does STM32F091CCU7TR support USB device functionality?

No. Although pinout includes PA11/PA12 labeled as USB D+/D−, the STM32F091xC variant does not integrate a USB PHY or USB controller per ST's device summary (Table 2, DocID026284 Rev 4). These pins default to GPIO or alternate functions like TIM1_CH4/CH3.

What is the maximum operating temperature range for STM32F091CCU7TR?

The STM32F091CCU7TR is specified for industrial temperature range: –40 °C to +85 °C, validated per electrical characteristics in Section 6.3.1 of the datasheet. Thermal derating begins above 85 °C ambient, and junction temperature must remain ≤125 °C under all operating conditions.

Can the internal 48 MHz oscillator (HSI48) be used as system clock without external crystal?

Yes. HSI48 can serve as the system clock source directly or feed the PLL. Its auto-trimming capability - synchronized to USB SOF packets or an external 1 kHz signal - maintains ±0.25% accuracy, eliminating need for external crystal in non-CAN/RTC-critical applications.

How many I/O pins support independent VDDIO2 supply?

Nineteen I/O pins (PA[13:15], PB[3:7], PC[6:10], PD[0:2]) are grouped under VDDIO2, allowing separate 1.65–3.6 V supply. This enables interoperability with low-voltage peripherals (e.g., 1.8 V sensors) while main I/Os operate at 3.3 V, verified in Section 3.7 and Table 13 of the datasheet.