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STMicroelectronics STM32F091RCT6U
- Part No.:
- STM32F091RCT6U
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM32F091RCT6U.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,859
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Product details
Overview
STM32F091RCT6U from STMicroelectronics is a 32-bit ARM Cortex-M0 microcontroller with 256 KB Flash, 32 KB SRAM, integrated CAN 2.0B interface, dual 12-bit DAC, and 12-bit ADC (1.0 µs conversion), operating at up to 48 MHz in 2.0–3.6 V supply range. It supports capacitive touch sensing (24 channels), RTC with alarm, and advanced timer control for motor drive and industrial automation.
For engineers reviewing the STM32F091RCT6U datasheet, STM32F091RCT6U pinout, STM32F091RCT6U application, or STM32F091RCT6U equivalent, key selection criteria include CAN bus integration, 5V-tolerant I/O count (69 pins), low-power Stop/Standby modes, and UFBGA100 package compatibility with high-density PCB layouts.
Technical Context
This MCU implements an ARM Cortex-M0 core with hardware parity on SRAM and CRC calculation unit for firmware integrity. Its clock system combines internal oscillators (HSI48 with auto-trimming, LSI, LSE) and external crystal support (4–32 MHz HSE, 32 kHz RTC), enabling precise timing across power modes.
The peripheral set includes two I²C interfaces (one with SMBus/PMBus), eight USARTs (three with ISO7816/LIN/IrDA), two SPI/I²S modules, and a dedicated HDMI-CEC receiver - all coordinated via NVIC and DMA controller supporting up to 12 channels for deterministic real-time response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M0, 48 MHz max - enables deterministic real-time control without cache or MMU overhead |
| Flash / SRAM | 256 KB Flash + 32 KB SRAM with HW parity - supports secure boot and robust data logging in industrial environments |
| Analog Peripherals | 1× 12-bit ADC (16 ch, 1.0 µs), 2× 12-bit DAC, 2× analog comparators - suitable for closed-loop sensor signal conditioning and waveform generation |
| Communication | CAN 2.0B, 2× I²C (Fast Mode Plus), 8× USART (3× ISO7816), 2× SPI/I²S - meets automotive body electronics and industrial fieldbus requirements |
| Timers & Control | 1× 16-bit advanced timer (6-channel PWM), 7× general-purpose timers, RTC with calendar - supports motor FOC, LED dimming, and time-stamped event logging |
| Power & Packaging | 2.0–3.6 V operation, -40°C to +85°C, UFBGA100 (7×7 mm) - compatible with compact, thermally constrained embedded designs |
| I/O Capability | Up to 88 fast I/Os, 69 with 5V tolerance, 19 with independent VDDIO2 supply - simplifies level-shifting and mixed-voltage subsystem interfacing |
Pinout & Package
STM32F091RCT6U uses a 100-pin UFBGA package (7 × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per ST's official pin definition table (DocID026284 Rev 4, Table 13), supporting full GPIO remapping and alternate function routing via AFR registers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VSS, VSSA | Power supply and ground | Digital (VDD/VSS) and analog (VDDA/VSSA) domains must be decoupled separately; VDDA ≥ 2.4 V required for ADC/DAC accuracy |
| PA13/PA14/PA15 | SWD debug interface | Serial Wire Debug (SWDIO/SWCLK/NRST) enables non-intrusive programming and real-time trace without JTAG pins |
| PD0/PD1 | HSE oscillator input/output | Supports 4–32 MHz external crystal for precise clock source; optional bypass mode for external clock input |
| PA11/PA12 | USB DP/DM (not available on this variant) | Not connected - STM32F091RCT6U lacks USB PHY; these pins default to GPIO or alternate functions (e.g., USART1) |
| PB8/PB9 | CAN_RX/CAN_TX | Dedicated differential CAN bus interface compliant with ISO 11898-1; requires external transceiver for physical layer |
| PC13/PC14/PC15 | RTC oscillator & backup domain | LSE (32.768 kHz) connection for calendar RTC; retains time/date during Standby with VBAT supply |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Touch Sensing (TSC) | 24-channel controller with built-in charge transfer, eliminating external RC networks for touchkey/rotary applications |
| Low-Power Modes | Sleep (CPU off), Stop (1.3 µA typical), Standby (0.5 µA) with RTC/VBAT retention - extends battery life in portable and remote sensors |
| HDMI-CEC Receiver | Dedicated hardware block wakes MCU on CEC header detection - enables always-on, ultra-low-power consumer electronics control |
| Programmable Voltage Detector (PVD) | Configurable threshold (2.2–2.9 V) triggers interrupt or reset before brown-out - protects firmware execution integrity |
| Independent Watchdog (IWDG) | LSI-based 40 kHz clock ensures reliable timeout even if main clock fails - critical for fail-safe industrial controllers |
Applications
| Industrial Motor Control | Automotive Body Electronics |
|---|---|
Use Scenario: Brushless DC motor commutation using six-step or FOC algorithms with current sensing and PWM timing. IC Role / Device Role / Timing Role: Main controller executing motor control loop, generating synchronized 6-channel PWM via TIM1, sampling ADC for phase currents. Use Value: Integrated advanced timer with dead-time insertion and fast ADC enable sub-microsecond current loop closure. | Use Scenario: Door module managing window lift, mirror adjustment, and interior lighting with LIN communication. IC Role / Device Role / Timing Role: LIN master node handling protocol framing, checksum, and slave addressing; also drives RGB LEDs via PWM. Use Value: Three LIN-capable USARTs allow multi-node coordination; 5V-tolerant I/Os interface directly with 12 V automotive loads. |
| Smart Energy Metering | Human-Machine Interface (HMI) |
Use Scenario: Electricity meter with pulse counting, tamper detection, and RS-485 communication for utility data upload. IC Role / Device Role / Timing Role: System-on-chip managing metrology ADC sampling, RTC timestamping of events, and isolated RS-485 via USART+transceiver. Use Value: Hardware CRC and SRAM parity ensure firmware/data integrity; CAN interface supports DLMS/COSEM over PLC backhaul. | Use Scenario: Touch-enabled control panel for HVAC or medical device with slider, button, and proximity wake-up. IC Role / Device Role / Timing Role: Capacitive touch controller scanning 24 electrodes, driving segmented LCD via COM/SEG outputs, and managing low-power sleep/wake cycles. Use Value: On-die TSC eliminates external touch IC; HDMI-CEC wakeup allows remote activation without constant polling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32F072RBT6 | 128 KB Flash, no CAN, 1× DAC, 64-pin LQFP - lower peripheral count and no CAN 2.0B support | Suitable for cost-sensitive USB-connected devices (has USB 2.0 FS); not viable for CAN-based fieldbus systems | Select only when CAN is unnecessary and USB host/device functionality is required |
| STM32F303RCT6 | 256 KB Flash, 48 MHz Cortex-M4F, FPU, 2× 12-bit ADC (5 MSPS), no TSC - adds DSP capability but removes capacitive sensing | Better for math-intensive tasks (e.g., digital power supply control); lacks native touch interface | Choose when floating-point computation or higher ADC throughput outweighs touch/HDMI-CEC needs |
Compared with STM32F072RBT6, STM32F091RCT6U provides essential CAN connectivity and touch sensing at no BOM cost premium; versus STM32F303RCT6, it trades FPU and dual ADC speed for lower power, smaller footprint, and integrated HMI peripherals - making it optimal for resource-constrained CAN-connected HMIs.
Availability
STM32F091RCT6U is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, smart energy metering, and human-machine interface applications requiring stable component supply and long-term manufacturability.
Supply support for STM32F091RCT6U 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 with vertical manufacturing and broad industrial certification coverage.
The STM32F0 series targets cost-sensitive, low-power embedded applications demanding ARM Cortex-M0 performance, rich analog integration, and robust peripheral sets - optimized for industrial control, appliance, and IoT edge nodes.
FAQ
Does STM32F091RCT6U support USB device functionality?
No. STM32F091RCT6U does not integrate a USB PHY or USB controller. Pins PA11/PA12 are available as GPIO or alternate functions (e.g., USART1_CK), but lack USB transceiver circuitry. For USB, select STM32F072xx or STM32F042xx variants.
What is the maximum operating temperature range for STM32F091RCT6U?
The STM32F091RCT6U is rated for industrial temperature range: –40 °C to +85 °C ambient. This is confirmed in Section 6.3.1 of the datasheet (DocID026284 Rev 4, Table 24), and applies to all UFBGA100-packaged devices in the STM32F091xC family.
Can the internal 48 MHz oscillator (HSI48) be used as the system clock source?
Yes. The HSI48 oscillator is factory-trimmed and supports automatic synchronization to USB SOF or external clock signals. It can serve as the main PLL input or directly drive the system clock, enabling full-speed operation without external crystals - verified in Section 3.6 and Table 43 of the datasheet.
How many I/O pins support 5V tolerance on STM32F091RCT6U?
69 I/O pins are 5V-tolerant, as specified in the "Features" section (page 1) and electrical characteristics Table 53. These include most GPIOs except those in the analog domain (e.g., ADC/DAC pins) and specific debug pins - enabling direct interfacing with 5V logic without level shifters.
STM32F091RCT6U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-LQFP
- 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:
- 52
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 32K x 8
- Voltage - Supply (Vcc/Vdd):
- 2V ~ 3.6V
- Data Converters:
- A/D 19x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32F091RCT6U FAQ
1.How can I place an order for STM32F091RCT6U through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32F091RCT6U 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 STM32F091RCT6U reliable?
The price and inventory of STM32F091RCT6U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32F091RCT6U is usually 5 days.
3.What payment methods are accepted for STM32F091RCT6U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32F091RCT6U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32F091RCT6U?
STM32F091RCT6U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32F091RCT6U 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 STM32F091RCT6U?
For technical support, including STM32F091RCT6U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32F091RCT6U requirements.
6.How does Aetrix verify that STM32F091RCT6U is sourced from the original manufacturer or authorized distributors?
All STM32F091RCT6U 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 STM32F091RCT6U meets industry standards.
7.What is the process for return or replacement of STM32F091RCT6U?
All STM32F091RCT6U units undergo pre-shipment inspection (PSI). If there is an issue with STM32F091RCT6U, 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 STM32F091RCT6U part is unused and in its original packaging.
Return procedure for STM32F091RCT6U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM32F091RCT6U Tags
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