Item specifics
Description
STM32G491VET6 Product Overview
STM32G491VET6 is a Cortex-M4 MCU at 170 MHz with FPU and math accelerator, LQFP-100. It features 512 KB Flash, 128 KB SRAM, a high-resolution timer (HRTIM, 12 channels, 184 ps resolution), USB 2.0 FS device (crystal-less), CAN FD, five 12-bit ADCs (5 Msps, 26 ch), seven 12-bit DACs, six op-amps (PGA), seven comparators, four Σ-Δ modulators (DFSDM, 8 ch / 4 filters), two SAI audio interfaces, two advanced motor control timers, multiple GP/LP timers, RTC, 3×USART, 2×UART, 2×SPI/I2S, 3×I2C. 86 x 5 V-tolerant I/Os. 1.71–3.6 V, -40–85 °C. As a member of the G4 series high-performance mixed-signal MCUs, this device combines advanced HRTIM, a full analog front-end, and SAI audio interfaces in a 100-pin package, delivering a top-tier single-chip solution for demanding digital power, precision motor control, multi-channel sensing, and audio applications.
STM32G491VET6 Core Features
Core: Cortex-M4 170 MHz, FPU + ART Accelerator + Math Accelerator (FMAC, CORDIC)
Memory: 512 KB Flash, 128 KB SRAM
High-Resolution PWM: 12-ch HRTIM with 184 ps resolution for complex topologies and precise switching
Analog: 6×PGAs, 5×12-bit ADCs (5 Msps, 26 ch), 7×12-bit DACs, 7×Comparators
Σ-Δ Modulators: 4×Σ-Δ modulators (DFSDM, 8 ch / 4 filters) for multi-channel high-precision sensor interfaces
Audio: 2×SAI (Serial Audio Interface) supporting I2S, PCM, and other audio protocols
Motor Control: 2×Advanced Timers (PWM/Deadtime/Brake), HRTIM, multiple GP/LP timers
Connectivity: USB 2.0 FS (Crystal-less), CAN FD, 3×USART, 2×UART, 2×SPI/I2S, 3×I2C
I/Os: 86 (5 V-tolerant)
Package: LQFP-100
Temperature Range: -40°C to 85°C
STM32G491VET6 Applications
Digital Power: Multi-channel digital power supplies, full/half-bridge resonant converters, PFC, power management
Precision Motor Control: Multi-axis FOC, high-precision servo drives, BLDC/PMSM, stepper motors
Precision Sensing & Instrumentation: Multi-channel Σ-Δ sensor measurement, industrial transmitters, high-accuracy data acquisition
Audio & Consumer: Audio interfaces, advanced drones, power tools, portable medical devices
Automotive/Industrial Communication: CAN FD nodes, industrial automation, control systems requiring extensive interfaces
STM32G491VET6 Key Advantages
Full Analog Integration + HRTIM: 6 op-amps, 7 comparators, 7 DACs, 5 ADCs, 4 Σ-Δ and 12-ch high-resolution PWM combine for a highly integrated digital power and motor control system
512 KB Flash + 128 KB SRAM: Large memory for complex real-time control algorithms
170 MHz Cortex-M4 + FPU + Math Accelerator: Powerful real-time processing and DSP performance
SAI Audio Interface: Easily add audio capabilities alongside control for HMI and other applications
Rich Connectivity: USB, CAN FD, multiple USART/UART, I2C, SPI for flexible system connection
86 I/Os in 100-Pin Package: Abundant pin resources, high integration
1.71–3.6 V Wide Supply: Flexible adaptation to different power rails
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FAQ
1. What is the STM32G491VET6, and where is it positioned in the STM32G4 series?
The STM32G491VET6 is a high‑performance mixed‑signal microcontroller from STMicroelectronics' STM32G4 series, built around an Arm® Cortex®‑M4 core with FPU and DSP extensions running at 170 MHz, in an LQFP‑100 package. It integrates a rich set of precision analog peripherals (multiple rail‑to‑rail op‑amps, ultra‑low‑power comparators, 12‑bit ADCs and DACs) together with advanced digital control timers including the high‑resolution timer (HRTIM). It is a representative model in the G4 family designed for applications that demand extensive analog signal conditioning and precise real‑time control, such as digital power supplies, motor drives, and industrial sensor systems.
2. How does the STM32G491VET6 differ from the STM32G474VET6, and how should I choose based on my needs?
Both share the same Cortex‑M4 170 MHz core, high‑resolution timer (HRTIM), and rich analog peripherals. The main difference lies in storage: the G491VET6 provides 512 KB Flash and 112 KB SRAM, while the G474VET6 typically offers 128 KB or 256 KB Flash and 128 KB SRAM. The G491’s larger Flash is better suited for applications with bigger firmware footprints. If your code size is large, the G491 is the more appropriate choice; if your memory requirements are moderate and you want to optimize cost, a smaller‑Flash variant in the G474 series offers better value.
3. What can the built‑in op‑amps and comparators actually do? Can they eliminate external analog chips?
The chip integrates up to five rail‑to‑rail operational amplifiers and multiple ultra‑low‑power comparators. The op‑amps can directly process small signals from current‑sense resistors, Hall sensors, or thermocouples, performing amplification, filtering, and offset adjustment—completely eliminating external op‑amp ICs. The comparators are used for over‑current protection, zero‑crossing detection, and voltage‑threshold monitoring. All of this is handled internally, significantly reducing BOM cost and PCB area, especially for space‑constrained compact control boards.
4. What is the high‑resolution timer (HRTIM), and what can it do on this chip?
The HRTIM is a high‑resolution timer capable of delivering PWM resolution down to 184 ps. In digital power and motor‑control applications, it generates extremely precise and flexible PWM waveforms supporting various topologies (LLC, half‑bridge, full‑bridge, phase‑shifted full‑bridge, etc.). This fine resolution allows more accurate regulation of output voltage or current, resulting in more stable and responsive control loops. For power converters or precision servo drives that demand high efficiency and high power density, the HRTIM is an indispensable core peripheral.
5. What can the USB‑C interface on the STM32G491VET6 do? Does it support Power Delivery?
The integrated USB‑C power‑delivery and communication controller supports USB 2.0 full‑speed device communication and can deliver up to 15 W (5 V/3 A) through simple CC‑pin detection. It does not implement the full USB Power Delivery (PD) protocol. If PD is required, an external PD controller can be added. For applications that do not need PD, the MCU can be powered and communicate directly over USB‑C, making it ideal for portable devices and small USB‑powered instruments.
6. What communication interfaces does the chip offer? Does it support CAN FD?
It integrates up to three FDCAN (Flexible Data‑Rate CAN) controllers, which are backward‑compatible with CAN 2.0 while supporting higher data rates (up to 5 Mbps) and larger payloads (up to 64 bytes). Additionally, it provides multiple UARTs, SPIs, I²Cs, and I²S interfaces. All of these can operate simultaneously, making the chip ideal for industrial automation, vehicle networks, and distributed control systems that require high‑speed, reliable communication.
7. Does the 512 KB Flash support dual‑bank and OTA updates? How can update safety be ensured?
Yes. It features a dual‑bank Flash architecture, allowing current firmware to execute from one bank while the other is erased and programmed. After a new firmware image is downloaded to the alternate bank and verified, a simple boot‑address switch completes the update. If a power loss or verification failure occurs, the system automatically rolls back to the original firmware, guaranteeing the device is never bricked. Combined with code readout protection (RDP) and the Memory Protection Unit (MPU), a secure firmware‑update mechanism can be implemented—ideal for industrial IoT equipment requiring highly reliable remote maintenance.
8. What is its power consumption like? Is it suitable for industrial wide‑temperature environments?
The STM32G4 series is built on an advanced 90 nm process, with a run‑mode current as low as about 100 µA/MHz. It supports multiple low‑power modes—Sleep, Stop, and Standby—with Standby current dropping to the micro‑amp range. Combined with fast wake‑up times, it is well‑suited for battery‑powered portable industrial equipment and handheld instruments that require long battery life. The chip is typically rated for the industrial temperature range (-40 °C to 85 °C) and can operate reliably over the long term in harsh industrial environments.
9. What development tools are needed for the STM32G491VET6, and is it compatible with previous STM32 ecosystems?
It is fully compatible with the STM32Cube ecosystem, including the free STM32CubeMX configuration tool, STM32CubeIDE integrated development environment, and the STM32CubeG4 firmware package. If you have previously worked with STM32F3 or STM32F4 series, a large portion of HAL code can be reused; the main adjustments involve analog‑peripheral configuration and pin mapping. Official example projects and reference designs for digital power and motor control are also provided to accelerate development.
10. If I need more analog channels or larger memory, what upgrade options are available?
If the 512 KB Flash or 112 KB SRAM is insufficient, you can upgrade to higher‑end models in the same series, such as the STM32G474 (larger Flash and SRAM, richer analog peripherals) or the STM32G473. For higher pin counts, LQFP‑128 or BGA packages are available. Because all these devices belong to the STM32G4 family, code and hardware designs can be highly reused, minimizing migration effort.