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STMicroelectronics STM32F091CBU6TR
- Part No.:
- STM32F091CBU6TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
STM32F091CBU6TR.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 48UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,519
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Product details
Overview
STM32F091CBU6TR from STMicroelectronics is a 32-bit ARM® Cortex®-M0 microcontroller with 128 KB Flash, 32 KB SRAM (with hardware parity), integrated CAN 2.0B interface, dual 12-bit DAC channels, and 12-bit ADC (1.0 µs conversion time). It operates from 2.0–3.6 V, supports up to 48 MHz CPU frequency, and targets embedded control applications requiring real-time communication, analog signal generation, and capacitive touch sensing.
For engineers reviewing the STM32F091CBU6TR datasheet, STM32F091CBU6TR pinout, STM32F091CBU6TR application, or STM32F091CBU6TR equivalent, key selection criteria include CAN-enabled industrial node design, low-power RTC-backed operation, 5V-tolerant I/O capability (up to 69 pins), and hardware-accelerated CRC for firmware integrity verification.
Technical Context
This MCU integrates an ARM Cortex-M0 core with tightly coupled peripherals including two I²C interfaces (one supporting Fast Mode Plus at 1 Mbit/s), eight USARTs (three with ISO7816, LIN, IrDA), two SPI/I²S controllers, and a dedicated HDMI-CEC receiver for wake-up. Its clock system combines internal oscillators (HSI48 with auto-trimming, LSI, LSE) and external crystal support (4–32 MHz HSE, 32 kHz RTC oscillator).
The device features a 12-channel DMA controller, advanced-control timer (TIM1) for 6-channel PWM, seven general-purpose timers, and a touch-sensing controller (TSC) supporting up to 24 capacitive sensing channels - enabling direct integration of touchkey, linear, and rotary sensors without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M0, 48 MHz max - enables deterministic real-time execution for motor control and protocol stacks. |
| Flash Memory | 128 KB - sufficient for dual-bank firmware updates and bootloader + application separation. |
| SRAM | 32 KB with hardware parity - ensures data integrity in safety-critical sensor or communication buffers. |
| Analog Peripherals | 12-bit ADC (16-channel, 1.0 µs), dual 12-bit DAC, 2 comparators - supports closed-loop analog control and waveform generation. |
| Communication | CAN 2.0B, 2× I²C (Fast Mode Plus), 8× USART (3× ISO7816), 2× SPI/I²S - meets industrial fieldbus and smart peripheral interconnect needs. |
| I/O Capability | Up to 88 fast I/Os; 69 with 5V tolerance - simplifies level-shifting in mixed-voltage systems (e.g., 5V sensors + 3.3V logic). |
| Power Management | Three low-power modes (Sleep/Stop/Standby), VBAT backup for RTC & registers - enables battery-backed operation for metering or alarm systems. |
Pinout & Package
STM32F091CBU6TR uses the UFQFPN48 (7 × 7 mm) package with 48-pin quad flat no-lead construction, optimized for compact PCB layouts and automated assembly. Pin functions are validated per STMicroelectronics DocID026284 Rev 4, Section 4 ("Pinouts and pin descriptions").
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VSS, VSSA | Power supply and ground | Digital (2.0–3.6 V) and separate analog (2.4–3.6 V) domains ensure noise isolation for ADC/DAC accuracy. |
| PA0–PA15, PB0–PB15, PC13–PC15, PD0–PD2 | General-purpose I/O | Configurable as GPIO, alternate function (AF), or analog input; up to 69 pins support 5V tolerance for legacy interface compatibility. |
| PA11/PA12 | USB D+/D− | Full-speed USB 2.0 interface (requires external pull-ups); not present on all variants but confirmed for F091xC series. |
| PA13/PA14 | SWDIO/SWCLK | Serial Wire Debug interface - enables non-intrusive programming and real-time debugging with minimal pin count. |
| PB8/PB9 | CAN_RX/CAN_TX | Dedicated CAN 2.0B physical layer interface - supports robust automotive and industrial network node implementation. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware CRC unit | Accelerates firmware image validation and data packet integrity checks without CPU overhead. |
| Capacitive touch controller (TSC) | Supports 24-channel touch sensing with built-in charge transfer and acquisition - eliminates need for external touch IC in HMI designs. |
| Programmable voltage detector (PVD) | Monitors VDD and triggers interrupt or reset when voltage drops below user-configurable threshold - critical for brown-out protection. |
| Internal 48 MHz oscillator (HSI48) | Factory-trimmed ±2% accuracy, USB-ready clock source - removes external crystal requirement for USB-CDC or HID applications. |
| RTC with calendar and alarms | Independent VBAT-powered real-time clock with calendar, alarm, and periodic wakeup - enables time-stamped logging and scheduled wake from Stop/Standby. |
Applications
| Industrial Sensor Node | Smart Meter Interface |
|---|---|
Use Scenario: Remote environmental monitoring node with temperature/humidity sensors, CAN bus connectivity, and local capacitive buttons. IC Role / Device Role / Timing Role: Central controller managing sensor acquisition (ADC), actuator drive (DAC/PWM), CAN message framing, and low-power scheduling via RTC alarms. Use Value: Integrated CAN + 5V-tolerant I/O reduces BOM count; hardware CRC ensures secure OTA firmware updates over CAN. | Use Scenario: Electricity/water meter with ISO7816-compliant metrology interface, LCD driver, and tamper detection. IC Role / Device Role / Timing Role: Metrology co-processor handling pulse counting (TIM inputs), secure communication (ISO7816 USART), and display timing (SPI/LCD controller). Use Value: Dual USARTs with ISO7816 support enable direct smart-card reader integration; VBAT-backed RTC maintains billing timestamps during power loss. |
| Home Appliance Control Panel | Automotive Body Control Module |
Use Scenario: Washing machine UI with rotary encoder, LED indicators, buzzer, and motor control feedback. IC Role / Device Role / Timing Role: Main UI controller executing touch sensing (TSC), audio tone generation (DAC), PWM-driven LEDs, and motor phase monitoring (ADC). Use Value: 24-channel TSC enables full front-panel touch without external IC; 12-bit DAC provides smooth buzzer volume control. | Use Scenario: Door module managing window lift, mirror adjustment, and interior lighting with LIN communication. IC Role / Device Role / Timing Role: LIN slave node interpreting commands (USART-LIN), driving motors (TIM1 PWM), and monitoring switch states (5V-tolerant GPIO). Use Value: LIN-capable USART with auto-baud detection simplifies integration into vehicle networks; 5V-tolerant I/O interfaces directly with automotive switch harnesses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32F072CBT6 | No CAN interface; 128 KB Flash, same 48-pin UFQFPN package; lacks HDMI-CEC and TSC. | Suitable for USB-based control nodes where CAN is unnecessary and touch sensing is handled externally. | Select when CAN and capacitive touch are not required - lower cost and identical footprint. |
| STM32F091RCT6 | LQFP64 package (64-pin), 256 KB Flash, same peripheral set; larger package allows more routing flexibility and additional I/Os. | Better suited for designs needing >48 I/Os or higher Flash for complex protocol stacks (e.g., CANopen + USB CDC). | Choose for expanded memory or I/O headroom; requires PCB redesign due to different package and pinout. |
Compared with STM32F072CBT6, the STM32F091CBU6TR adds CAN and TSC at no package size penalty; versus STM32F091RCT6, it trades Flash capacity and I/O count for smaller board area and lower component cost in space-constrained applications.
Availability
STM32F091CBU6TR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter interfaces, home appliance control panels, and automotive body control modules requiring stable component supply across multi-year production cycles.
Supply support for STM32F091CBU6TR 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, specializing in microcontrollers, power management, sensors, and automotive ICs.
The STM32F0 series delivers entry-level ARM Cortex-M0 performance with industrial-grade reliability, targeting cost-sensitive embedded applications requiring rich analog integration, communication flexibility, and low-power operation.
FAQ
Does STM32F091CBU6TR support USB device functionality?
Yes - it includes a full-speed USB 2.0 interface (PA11/PA12) with internal transceivers and USB clock derived from the HSI48 oscillator. No external crystal is required for USB operation, and the device supports CDC, HID, and MSC class drivers via STM32CubeMX middleware.
What is the maximum operating temperature range for this part?
The STM32F091CBU6TR is rated for industrial temperature range: –40 °C to +85 °C. This is confirmed in Section 6.3.1 ("General operating conditions") of the official datasheet (DocID026284 Rev 4), and applies to all package variants including UFQFPN48.
Can the internal 12-bit DAC drive a speaker directly?
No - the DAC outputs are buffered voltage sources (max 5 mA sink/source), not power amplifiers. Driving a speaker requires external amplification (e.g., op-amp or Class-D driver). However, the DAC can generate precise audio waveforms for feeding into such amplifiers or for calibration signals.
Is the 5V-tolerant I/O capability configurable per pin?
Yes - 5V tolerance is inherent to specific pins (e.g., PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD2) and does not require software enable. It is a hardware feature tied to pin structure; no register setting is needed. Pins not listed as 5V-tolerant must remain within VDD + 0.3 V.
STM32F091CBU6TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-UFQFN Exposed Pad
- Series:
- STM32F0
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M0
- Core Size:
- 32-Bit Single-Core
- Speed:
- 48MHz
- Connectivity:
- CANbus, I2C, IrDA, LINbus, SPI, UART/USART
- Peripherals:
- DMA, I2S, POR, PWM, WDT
- Number of I/O:
- 38
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 32K x 8
- Voltage - Supply (Vcc/Vdd):
- 2V ~ 3.6V
- Data Converters:
- A/D 13x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32F091CBU6TR FAQ
1.How can I place an order for STM32F091CBU6TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32F091CBU6TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM32F091CBU6TR reliable?
The price and inventory of STM32F091CBU6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32F091CBU6TR is usually 5 days.
3.What payment methods are accepted for STM32F091CBU6TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32F091CBU6TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32F091CBU6TR?
STM32F091CBU6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32F091CBU6TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM32F091CBU6TR?
For technical support, including STM32F091CBU6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32F091CBU6TR requirements.
6.How does Aetrix verify that STM32F091CBU6TR is sourced from the original manufacturer or authorized distributors?
All STM32F091CBU6TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32F091CBU6TR meets industry standards.
7.What is the process for return or replacement of STM32F091CBU6TR?
All STM32F091CBU6TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32F091CBU6TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM32F091CBU6TR part is unused and in its original packaging.
Return procedure for STM32F091CBU6TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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