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STMicroelectronics STM32F091CBU6
- Part No.:
- STM32F091CBU6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
STM32F091CBU6.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 48UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:252
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Product details
Overview
STM32F091CBU6 from STMicroelectronics is a 32-bit ARM Cortex-M0 microcontroller in UFQFPN48 package, featuring 128 KB Flash, 32 KB SRAM with hardware parity, integrated CAN 2.0B interface, dual 12-bit DAC channels, and 12-bit ADC with 16 inputs - deployed in industrial motor control, smart sensor hubs, and CAN-based building automation systems.
For engineers reviewing the STM32F091CBU6 datasheet, STM32F091CBU6 pinout, STM32F091CBU6 application, or STM32F091CBU6 equivalent, key selection criteria include CAN timing compliance (ISO 11898-1), 5V-tolerant I/O count (up to 69 pins), VDDIO2 independent supply support, HSI48 oscillator auto-trimming for USB-less device enumeration, and capacitive touch channel scalability (24-channel TSC).
Technical Context
The STM32F091CBU6 integrates an ARM Cortex-M0 core running at up to 48 MHz with tightly coupled NVIC, CRC calculation unit, and memory protection unit (MPU). Its clock system combines four oscillators - 4–32 MHz HSE, 32 kHz LSE, 8 MHz HSI with x6 PLL, and factory-trimmed 48 MHz HSI48 - enabling precise USB-free device synchronization and RTC calibration.
Power architecture supports three analog/digital domains (VDD, VDDA, VDDIO2), programmable voltage detector (PVD), and three low-power modes (Sleep, Stop, Standby) with sub-1 µA Standby current and 5 µs wakeup from Stop mode using internal RC sources - critical for battery-backed industrial telemetry nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M0, 48 MHz max - enables real-time deterministic control loops with <100 ns interrupt latency. |
| Flash / SRAM | 128 KB Flash, 32 KB SRAM with HW parity - supports secure firmware updates and ECC-protected data buffers. |
| Analog Peripherals | 1× 12-bit ADC (16 ch, 1 µs), 2× 12-bit DAC, 2× comparators - enables closed-loop analog signal generation and monitoring without external ICs. |
| Communication | CAN 2.0B, 8× USART (3 with ISO7816/LIN/IrDA), 2× I²C (Fast Mode Plus), 2× SPI/I²S - meets automotive diagnostics and industrial fieldbus requirements. |
| I/O Capability | 48-pin UFQFPN package with up to 39 GPIOs; 39 pins 5V-tolerant, 19 pins support VDDIO2 - simplifies level-shifting in mixed-voltage sensor interfaces. |
| Timing & Power | HSI48 auto-trimmed oscillator, PVD, Sleep/Stop/Standby modes - eliminates need for external crystal in cost-sensitive USB-hostless designs. |
| Capacitive Sensing | 24-channel TSC with spread-spectrum modulation - supports robust touchkey and rotary encoder UI on PCB without overlay sensors. |
Pinout & Package
UFQFPN48 (7 × 7 mm, 0.5 mm pitch) with exposed thermal pad - optimized for compact industrial control modules and space-constrained CAN edge nodes requiring thermal reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VSS, VSSA | Power supply and ground rails | Dual-domain separation ensures ADC/DAC accuracy unaffected by digital switching noise. |
| PA13/PA14/SWCLK/SWDIO | Serial Wire Debug interface | 2-pin debug access enables in-circuit programming and real-time trace without JTAG header footprint. |
| PA11/PA12 | USB Device (D+/D−) | Not applicable - STM32F091CBU6 lacks USB PHY; these pins are GPIO-only in this variant. |
| PD0/PD1 | CAN_RX/CAN_TX | Dedicated differential CAN transceiver interface compliant with ISO 11898-1 timing and slew rate. |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15, PF0–PF1 | General-purpose I/O | Up to 39 configurable GPIOs with 5V tolerance and remappable alternate functions - reduces board routing complexity. |
Key Features
| Feature | Design Value |
|---|---|
| HSI48 oscillator with auto-trimming | Enables accurate 48 MHz clock for timer-based PWM and communication without external crystal - cuts BOM cost and PCB area. |
| Independent VDDIO2 supply domain | Allows 19 GPIOs to operate at 1.65–3.6 V while main I/O runs at 2.0–3.6 V - supports interfacing with legacy 1.8 V logic or isolated sensors. |
| Capacitive Touch Sensing Controller (TSC) | 24-channel spread-spectrum acquisition with built-in charge transfer - delivers >60 dB noise immunity in noisy industrial environments. |
| Programmable Voltage Detector (PVD) | Configurable threshold (2.0–2.9 V) with interrupt output - enables graceful firmware shutdown before brownout resets corrupt memory. |
| Advanced-control Timer (TIM1) | 6-channel complementary PWM with dead-time insertion and fault input - directly drives 3-phase inverter gate drivers without external logic. |
Applications
| Industrial Motor Control | Smart Sensor Hub |
|---|---|
Use Scenario: Compact BLDC motor driver for HVAC fans with integrated current sensing and thermal monitoring. IC Role / Device Role / Timing Role: Main controller executing FOC algorithm, generating 6-channel PWM via TIM1, sampling ADC at 100 kSPS, and communicating over CAN bus. Use Value: Eliminates external op-amps and comparator ICs via integrated analog peripherals; achieves <5 µs loop latency using hardware-accelerated math instructions. | Use Scenario: Battery-powered environmental node aggregating temperature, humidity, and CO₂ readings across RS-485 and I²C sensors. IC Role / Device Role / Timing Role: Central aggregator with RTC wake-up, low-power Stop mode between 10 s intervals, and CAN gateway to central building controller. Use Value: Sub-1 µA Standby current extends 2xAA battery life beyond 5 years; VDDIO2 domain isolates 3.3 V sensor I/O from 1.8 V MCU core. |
| Building Automation Panel | Medical Diagnostic Interface |
Use Scenario: Touch-enabled wall-mounted thermostat with capacitive buttons, ambient light sensing, and HVAC actuator control. IC Role / Device Role / Timing Role: UI processor managing 12-key TSC, driving 2× DAC for analog setpoint outputs, and communicating via LIN to HVAC ECU. Use Value: Integrated TSC replaces mechanical switches and external touch controller; DAC outputs meet ±0.5% linearity spec for analog control signals. | Use Scenario: Portable ECG front-end module acquiring biopotential signals and transmitting processed waveforms via UART to host tablet. IC Role / Device Role / Timing Role: Signal conditioner with 12-bit ADC oversampling, digital filtering in Cortex-M0, and ISO7816-compliant UART for medical-grade serial protocol. Use Value: Hardware parity on SRAM prevents silent data corruption in diagnostic waveform buffers; PVD ensures safe shutdown during battery depletion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32F072CBU6 | Same UFQFPN48 package, 128 KB Flash, but lacks CAN and TSC; includes USB 2.0 FS device. | Suitable for USB-connected HID devices (e.g., medical dongles), not CAN fieldbus nodes. | Select when USB connectivity is mandatory and CAN is unnecessary. |
| STM32F098RBT6 | LQFP64 package, adds USB 2.0 FS PHY and full-speed USB device stack; retains CAN and TSC. | Requires larger PCB footprint but enables USB-CDC virtual COM port for firmware updates and diagnostics. | Select when field-serviceability via USB is required alongside CAN infrastructure. |
Compared with STM32F091CBU6, STM32F072CBU6 trades CAN for USB and removes TSC - reducing cost for consumer HID applications; STM32F098RBT6 adds USB PHY and larger package, increasing board area but enabling direct host-side firmware updates without external programmers.
Availability
STM32F091CBU6 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor hubs, and building automation panels requiring stable component supply across multi-year production cycles.
Supply support for STM32F091CBU6 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, specializing in microcontrollers, power management, and automotive ICs with broad industrial and consumer reach.
The STM32F0 series targets cost-sensitive, low-power embedded applications demanding high peripheral integration and robust toolchain support - designed specifically for industrial control, appliance, and IoT edge nodes.
FAQ
Does STM32F091CBU6 support USB functionality?
No. The STM32F091CBU6 does not include a USB physical layer (PHY) or USB controller. Pins PA11/PA12 are general-purpose I/Os in this variant, unlike the STM32F072 or STM32F098 families which integrate full-speed USB 2.0 device capability. USB connectivity requires external PHY or alternative MCU selection.
What is the maximum operating temperature range for STM32F091CBU6?
The STM32F091CBU6 is qualified for industrial temperature range: –40 °C to +85 °C. This is confirmed in Section 6.3.1 of the official datasheet (DocID026284 Rev 4), with all electrical characteristics specified across this range, including Flash endurance and ADC linearity performance.
How many 5V-tolerant I/O pins does STM32F091CBU6 have in UFQFPN48 package?
In the UFQFPN48 package, STM32F091CBU6 provides 39 5V-tolerant I/O pins. This count is derived from Table 2 ("Device features") and Pin Definitions (Table 13) in the datasheet, where all GPIOs except those assigned to VDDA, VSSA, VREF+, and BOOT0 are rated for 5V tolerance under specified conditions.
Is the HSI48 oscillator suitable for time-critical communication like CAN or USART?
Yes. The HSI48 oscillator features automatic trimming against external synchronization signals (e.g., USB SOF or external clock reference), achieving ±0.25% frequency accuracy over temperature and voltage - sufficient for CAN bit timing (±1% tolerance per ISO 11898-1) and asynchronous USART operation up to 1 Mbps without external crystal.
STM32F091CBU6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-UFQFN Exposed Pad
- Series:
- STM32F0
- Packaging:
- Tray
- 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:
STM32F091CBU6 FAQ
1.How can I place an order for STM32F091CBU6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32F091CBU6 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 STM32F091CBU6 reliable?
The price and inventory of STM32F091CBU6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32F091CBU6 is usually 5 days.
3.What payment methods are accepted for STM32F091CBU6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32F091CBU6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32F091CBU6?
STM32F091CBU6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32F091CBU6 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 STM32F091CBU6?
For technical support, including STM32F091CBU6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32F091CBU6 requirements.
6.How does Aetrix verify that STM32F091CBU6 is sourced from the original manufacturer or authorized distributors?
All STM32F091CBU6 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 STM32F091CBU6 meets industry standards.
7.What is the process for return or replacement of STM32F091CBU6?
All STM32F091CBU6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32F091CBU6, 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 STM32F091CBU6 part is unused and in its original packaging.
Return procedure for STM32F091CBU6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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