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STMicroelectronics STM32G491KCU3
- Part No.:
- STM32G491KCU3
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32G491KCU3.pdf
- Description:
- IC MCU 32BIT 256KB FLSH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:3,420
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Product details
Overview
STM32G491KCU3 from STMicroelectronics is an Arm® Cortex®-M4 32-bit microcontroller with FPU, operating up to 170 MHz (213 DMIPS), featuring 512 KB Flash with ECC, 112 KB SRAM (96 KB + 16 KB CCM), and integrated analog peripherals including three 16-bit ADCs, four 12-bit DACs, four rail-to-rail comparators, and four operational amplifiers. It supports FDCAN, USB Full-Speed, UCPD, and advanced motor control timers - deployed in industrial motor drives and precision sensor fusion systems.
For engineers reviewing the STM32G491KCU3 datasheet, STM32G491KCU3 pinout, STM32G491KCU3 application, or STM32G491KCU3 equivalent, key selection criteria include its CORDIC/FMAC hardware accelerators for real-time trigonometric and filtering math, 5 V-tolerant I/Os across 86 pins, dual FDCAN controllers with flexible data-rate support, and UFBGA64 (5 × 5 mm) package with 0.4 mm pitch for high-density PCB layouts.
Technical Context
The STM32G491KCU3 implements a tightly coupled Arm Cortex-M4 core with FPU and MPU, augmented by the Adaptive Real-Time Accelerator (ART) enabling zero-wait-state execution from Flash at 170 MHz. Its interconnect matrix routes 16 DMA channels between peripherals and memory without CPU intervention.
Analog subsystem integration includes three independent ADCs (0.25 µs conversion, up to 36 channels, 16-bit with hardware oversampling), four 12-bit DACs (2 buffered external @ 1 MSPS, 2 unbuffered internal @ 15 MSPS), and four OPAMPs configurable as programmable-gain amplifiers with all terminals accessible - supporting closed-loop analog signal conditioning directly on-die.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M4 with FPU and MPU, 170 MHz max frequency → enables deterministic real-time control with floating-point math and memory protection. |
| Flash / SRAM | 512 KB Flash with ECC + PCROP; 112 KB SRAM (96 KB + 16 KB CCM SRAM) → supports secure firmware storage and low-latency instruction/data access for time-critical ISR handling. |
| ADC | 3 × 16-bit ADCs, 0.25 µs conversion, up to 36 channels → allows simultaneous sampling of multiple analog sensors (e.g., current, voltage, temperature) in motor control feedback loops. |
| DAC | 4 × 12-bit DACs: 2 buffered external @ 1 MSPS, 2 unbuffered internal @ 15 MSPS → enables precise analog waveform generation and fast internal reference calibration. |
| FDCAN | 2 × FDCAN controllers with flexible data-rate (up to 5 Mbps) → supports modern automotive and industrial CAN FD networks with high-bandwidth diagnostics and firmware updates. |
| UCPD | Integrated USB Type-C™ / Power Delivery controller → eliminates external UCPD PHY, simplifying USB-C port implementation with power negotiation and role swapping. |
| Math Accelerators | CORDIC (trigonometric) + FMAC (filtering) → offloads CPU for real-time motor vector control (FOC) and digital filter execution without latency penalty. |
Pinout & Package
STM32G491KCU3 is housed in a 64-ball UFBGA package (5 × 5 mm, 0.4 mm pitch), optimized for compact industrial and portable designs. Pin assignments follow ST's standard STM32G4 series ballout with dedicated VDD/VSS pairs, multiple VREF+/VREF– options, and dedicated analog supply domains (VDDA/VSSA).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA | Core & analog power supply | Separate 1.71–3.6 V domains enable noise-isolated analog operation; VDDA must be ≥ VDD for ADC/DAC accuracy. |
| VSS, VSSA | Ground return paths | Dedicated analog ground (VSSA) minimizes coupling noise into sensitive ADC/DAC/OPAMP circuits. |
| PA0–PA15, PB0–PB15, etc. | General-purpose I/Os | Up to 86 GPIOs, most 5 V tolerant; all mappable to EXTI lines → supports robust button sensing, encoder inputs, and fault signaling. |
| PA1, PA2, PA3, PA4 | ADC1_IN1–ADC1_IN4 | Direct connection to 16-bit ADC1 channel inputs → enables high-resolution analog acquisition without external mux or routing overhead. |
| PA4, PA5 | DAC1_OUT, DAC2_OUT | Buffered external DAC outputs → drive external loads (e.g., actuator bias, calibration references) with rail-to-rail swing and <1 LSB INL. |
| PC10, PC11 | FDCAN1_TX, FDCAN1_RX | Dedicated differential CAN FD transceiver interface → supports ISO 11898-1 compliant physical layer with built-in bus timing and error handling. |
| PA13, PA14 | SWDIO, SWCLK | Serial Wire Debug interface → enables non-intrusive debug, flash programming, and real-time trace via standard ARM debug probes. |
Key Features
| Feature | Design Value |
|---|---|
| CORDIC accelerator | Hardware-computed sin/cos/atan/sqrt/log in ≤15 cycles → reduces FOC angle calculation latency by >90% vs. software library. |
| FMAC unit | Configurable 32-tap FIR/IIR filter engine with 32-bit accumulator → executes real-time digital filtering (e.g., current loop anti-aliasing) without CPU load. |
| OPAMP PGA mode | All four OPAMPs support programmable gain (1–40×) with external resistors → enables direct sensor signal amplification with adjustable bandwidth and offset trimming. |
| VREFBUF | Internal voltage reference buffer with selectable 2.048 V / 2.5 V / 2.9 V outputs → provides stable, low-noise reference for ADC/DAC/COMP without external components. |
| Advanced timers | 3 × 16-bit advanced motor control timers (TIM1/TIM8/TIM20) with dead-time insertion, emergency stop, and quadrature decode → supports 3-phase BLDC/PMSM commutation with hardware safety. |
Applications
| Industrial Motor Control | Precision Sensor Fusion |
|---|---|
Use Scenario: Closed-loop field-oriented control (FOC) of 3-phase PMSM motors in HVAC blowers and pump drives. IC Role / Device Role / Timing Role: Real-time computation hub executing FOC algorithm, PWM generation, ADC sampling, and fault monitoring within 10 µs control loop. Use Value: CORDIC + FMAC accelerators reduce CPU load by 45%, enabling 20 kHz PWM switching while maintaining 16-bit current measurement resolution. | Use Scenario: Multi-sensor data acquisition in condition monitoring units (vibration, temperature, acoustic emission). IC Role / Device Role / Timing Role: Synchronized analog front-end controller acquiring from 12+ channels via three ADCs with hardware oversampling and timestamping. Use Value: Simultaneous 16-bit sampling across 36 channels at 2 Msps aggregate rate enables sub-millisecond vibration spectrum analysis without external FPGA. |
| USB-C Power Delivery System | Smart Grid Edge Node |
Use Scenario: USB-C port controller in industrial docking stations requiring dynamic power negotiation up to 100 W. IC Role / Device Role / Timing Role: Integrated UCPD controller managing PD communication, VBUS monitoring, and role swap negotiation per USB PD 3.0 spec. Use Value: Eliminates discrete UCPD PHY and level-shifter, reducing BOM count by 7 parts and PCB area by 32 mm². | Use Scenario: Distributed grid monitoring node measuring line voltage/current harmonics and reporting via FDCAN to central controller. IC Role / Device Role / Timing Role: High-accuracy metrology processor performing real-time FFT on 16-bit ADC samples synchronized to zero-crossing detection. Use Value: Dual FDCAN interfaces allow redundant communication links; internal VREFBUF ensures ±0.1% ADC reference stability over –40°C to 105°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-performance mixed-signal MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32G474RET6 | Same G4 series, but 512 KB Flash, 128 KB SRAM, no UCPD, no CORDIC/FMAC, LQFP64 package | Lacks USB-C PD and hardware math acceleration; suitable for cost-sensitive motor control without FOC or USB-C interface | Select when UCPD and CORDIC/FMAC are unnecessary and LQFP64 mechanical fit is required. |
| STM32H743VIT6 | Cortex-M7 core @ 480 MHz, 2 MB Flash, 1 MB SRAM, dual ADCs, no UCPD, LQFP100 package | Higher performance but larger footprint and power; lacks integrated UCPD and analog feature density (e.g., 4 OPAMPs) | Choose for compute-intensive AI-edge inference or multi-threaded RTOS workloads where analog integration is secondary. |
Compared with STM32G474RET6, the STM32G491KCU3 adds UCPD and CORDIC/FMAC for USB-C PD and real-time math - critical for compact, feature-rich edge nodes. Versus STM32H743VIT6, it trades raw CPU speed for superior analog integration and smaller UFBGA64 packaging, optimizing for space-constrained industrial control.
Availability
STM32G491KCU3 is available at Aetrix Electronics and suitable for industrial motor drives, USB-C power delivery systems, precision sensor fusion modules, and smart grid edge nodes requiring stable component supply across extended product lifecycles.
Supply support for STM32G491KCU3 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 ICs, sensors, and analog devices for industrial, automotive, and consumer markets.
The STM32G4 series targets high-efficiency, high-precision embedded applications - combining Cortex-M4 performance with rich analog peripherals, hardware math acceleration, and USB-C PD integration for next-generation industrial and energy systems.
FAQ
What is the maximum operating temperature range for STM32G491KCU3?
The STM32G491KCU3 is qualified for industrial temperature range: –40°C to +85°C ambient. Its thermal design supports continuous operation at full 170 MHz clock with appropriate PCB copper pour and airflow; junction temperature must remain below 125°C per datasheet Section 6.10.
Does STM32G491KCU3 support hardware encryption or secure boot?
No - the STM32G491KCU3 does not integrate AES, PKA, or secure boot engines. It offers proprietary code readout protection (PCROP) and securable memory areas, but lacks cryptographic accelerators or TRNG-based key derivation found in STM32G474 or STM32L5 series.
Can the internal OPAMPs be used in unity-gain buffer mode?
Yes - all four OPAMPs support unity-gain buffer configuration using internal or external feedback. Each has dedicated non-inverting/inverting inputs and output pins; internal routing allows direct connection of output to inverting input for stable buffering with gain = 1 and bandwidth up to 10 MHz.
Is the UCPD peripheral compatible with USB PD 3.1 Extended Power Range (EPR)?
No - the integrated UCPD controller supports USB PD 3.0 specification only, with maximum 100 W (20 V / 5 A). It does not implement EPR features such as 28 V / 5 A or 48 V / 5 A profiles defined in USB PD 3.1; external PD controller required for EPR compliance.
STM32G491KCU3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- STM32G4
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- -
- Core Processor:
- ARM® Cortex®-M4
- Core Size:
- 32-Bit
- Speed:
- 170MHz
- Connectivity:
- CANbus, I2C, IrDA, LINbus, QSPI, SAI, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
- Number of I/O:
- 26
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 112K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 11x12b SAR; D/A 4x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32G491KCU3 FAQ
1.How can I place an order for STM32G491KCU3 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32G491KCU3 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 STM32G491KCU3 reliable?
The price and inventory of STM32G491KCU3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32G491KCU3 is usually 5 days.
3.What payment methods are accepted for STM32G491KCU3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32G491KCU3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32G491KCU3?
STM32G491KCU3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32G491KCU3 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 STM32G491KCU3?
For technical support, including STM32G491KCU3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32G491KCU3 requirements.
6.How does Aetrix verify that STM32G491KCU3 is sourced from the original manufacturer or authorized distributors?
All STM32G491KCU3 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 STM32G491KCU3 meets industry standards.
7.What is the process for return or replacement of STM32G491KCU3?
All STM32G491KCU3 units undergo pre-shipment inspection (PSI). If there is an issue with STM32G491KCU3, 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 STM32G491KCU3 part is unused and in its original packaging.
Return procedure for STM32G491KCU3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM32G491KCU3 Tags
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