Item specifics
Description
STM32G431VBT6 Product Overview
STM32G431VBT6 is a Cortex-M4 MCU at 170 MHz with FPU and math accelerator, LQFP-100. 128 KB Flash, 32 KB SRAM, USB 2.0 FS device (crystal-less), CAN FD, two 12-bit ADCs (5 Msps, 21 ch), two 12-bit DACs, four op-amps (PGA), two comparators, advanced motor control PWM, LP timers, RTC, 3×USART/UART, 2×SPI/I2S, 2×I2C. 86 x 5 V-tolerant I/Os. 1.7–3.6 V, -40–85 °C. Compared to 64-pin versions, provides 86 I/Os for applications needing extensive pin connectivity in digital power, motor control, and precision sensing.
STM32G431VBT6 Core Features
Core: Cortex-M4 170 MHz, FPU + ART Accelerator + Math Accelerator (FMAC, CORDIC)
Memory: 128 KB Flash, 32 KB SRAM
Analog: 2×12-bit ADCs (5 Msps, 21 ch), 2×12-bit DACs, 4×PGAs, 2×Comparators
Motor Control: 2×Advanced Timers (PWM/Deadtime/Brake), multiple GP/LP timers
Connectivity: USB 2.0 FS (Crystal-less), CAN FD, 3×USART/UART, 2×SPI/I2S, 2×I2C
I/Os: 86 (5 V-tolerant)
Package: LQFP-100
Temperature: -40°C to 85°C
STM32G431VBT6 Applications
Digital Power: SMPS, Inverters, PFC
Motor Control: FOC, BLDC/PMSM Drives, Servo Controllers
Instrumentation: High-Precision Sensor Conditioning & Data Acquisition
Consumer Electronics: Drones, Power Tools, Portable Medical
Automotive/Industrial: CAN FD Nodes, Industrial Automation
STM32G431VBT6 Key Advantages
128 KB Flash + 170 MHz Cortex-M4 + FPU + Math Accelerator: Large memory and blazing-fast DSP
4 Op-Amps + 2 DACs + 2 Comparators + ADC: Superior analog integration, saves BOM
USB 2.0 + CAN FD: High-speed USB and industrial CAN bus on one chip
86 I/Os in 100-Pin Package: Abundant pin resources for complex system integration
Standard Industrial Temp Range: -40–85°C, optimal cost-effectiveness
1.7–3.6 V Wide Supply: Flexible for battery and various power sources
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FAQ
1. What is the STM32G431VBT6, and where is it positioned in the STM32G4 series?
The STM32G431VBT6 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 up to 170 MHz, in an LQFP‑100 package. It is a mid‑range member of the G4 family, featuring 128 KB dual‑bank Flash, 32 KB SRAM, and an additional 10 KB of CCM (Core Coupled Memory) SRAM. It integrates two rail‑to‑rail op‑amps, two ultra‑low‑power comparators, a 12‑bit 5 Msps ADC, a 12‑bit DAC, and offers rich peripherals such as FDCAN, USB‑C, and advanced timers (excluding HRTIM). It is designed for cost‑sensitive applications that require excellent real‑time control and some analog functionality but do not need a top‑tier analog front‑end or extremely high PWM resolution, such as general‑purpose variable‑frequency drives, digital power supplies, power tools, and industrial sensors.
2. How does the STM32G431VBT6 differ from the STM32G474VET6? Why choose the G431 over the G474?
The G431 is the value‑oriented product in the G4 series. Compared to the flagship G474, it simplifies analog and some digital features. The main differences are: ① the G431 lacks the high‑resolution timer (HRTIM), replacing it with multiple general‑purpose advanced timers; ② it has fewer op‑amps and comparators (typically two of each, versus up to five op‑amps and seven comparators on the G474); ③ its Flash and SRAM capacities are smaller (128 KB Flash / 32 KB SRAM vs. 128–512 KB Flash / 128 KB SRAM on the G474). If your application does not require extremely high PWM resolution (e.g., for LLC or phase‑shifted full‑bridge converters) and has modest analog‑channel needs, the G431 delivers the same 170 MHz processing power, USB‑C, and FDCAN at a significantly lower cost, making it ideal for cost‑sensitive, high‑volume products with well‑defined feature sets.
3. What can the built‑in op‑amps and comparators do? Are external analog chips still necessary?
The chip integrates two rail‑to‑rail operational amplifiers and two ultra‑low‑power comparators. The op‑amps can be used for current‑sense signal amplification and sensor signal conditioning (e.g., thermocouples or pressure sensors), eliminating external op‑amps. The comparators are typically used for over‑current protection, zero‑crossing detection, and voltage‑threshold monitoring. Although the channel count is lower than on the G474, it is sufficient for single‑ or dual‑current‑sensing motor‑control or digital‑power applications. These analog blocks are tightly coupled internally with ADCs and timers to form complete control loops, significantly reducing the need for external analog ICs and lowering BOM cost.
4. Is 128 KB of Flash sufficient? Can it run motor FOC or digital power algorithms?
128 KB of Flash can accommodate an optimized motor FOC control firmware, buck/boost converter control algorithms, a CANopen slave stack, and basic safety and protection logic. If your application does not require a complex graphical interface or file system, 128 KB is adequate. It supports a dual‑bank architecture (each bank 64 KB), enabling safe OTA firmware updates. If more program space is needed, you can upgrade to a variant with larger Flash in the same series, or store non‑volatile data in external SPI Flash.
5. What high‑speed 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 data rates up to 5 Mbps and 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. The LQFP‑100 package provides up to 82 I/Os, allowing multiple CAN FD channels and other peripherals to be brought out easily without pin‑conflict concerns.
6. What can the USB‑C interface on the STM32G431VBT6 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 a complete PD stack is required, an external dedicated 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.
7. Is the LQFP‑100 package easy to solder? Is it suitable for low‑volume hand assembly?
Very easy. The LQFP‑100 has all pins exposed with a 0.5 mm pitch and can be drag‑soldered with a standard iron and flux—no hot‑air station required. It strikes an excellent balance between mass production and hand prototyping, making it ideal for hobbyists, students, and small teams for rapid development and low‑volume production. The 14 mm × 14 mm size offers great compactness while remaining highly manageable.
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 STM32G431VBT6, 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 motor control and digital power are also provided to accelerate development.
10. If I later need HRTIM or more analog peripherals, what upgrade options are available?
If your project later requires high‑resolution PWM (e.g., for LLC or phase‑shifted full‑bridge) or more op‑amps and comparators, you can directly upgrade to the pin‑compatible STM32G474VET6. It provides the full HRTIM, along with five op‑amps and seven comparators, as well as larger Flash and SRAM, with zero hardware changes. If you need greater computational power and even larger SRAM, you can move to the STM32H7 series (such as the STM32H723 or H743). Because all these devices belong to the same STM32 ecosystem, code and hardware designs can be highly reused, and migration effort is minimal.