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Description
STM32G431CBU6 Product Overview
The STM32G431CBU6 development board is an ARM Cortex-M4 core board based on the STM32G431CBU6 MCU. The chip runs at up to 170MHz with 128KB Flash and 32KB SRAM, integrating a single-precision FPU and DSP instructions. As part of the STM32G4 series, this mixed-signal MCU is designed for motor control, digital power, lighting, and industrial automation. The compact core board brings out all available I/Os, making it suitable for motor drives, digital power supplies, industrial control, and embedded learning.
STM32G431CBU6 Core Features
High-Performance Cortex-M4 Core： ARM Cortex-M4F core up to 170MHz with FPU and DSP, delivering 213 DMIPS.
Motor Control Dedicated Peripherals： Integrated 3x op‑amps (PGA‑configurable), 4x DAC, 4x analog comparators, 2x 16‑bit advanced motor control timers (8‑channel PWM), optimized for BLDC/PMSM motor control.
Math Accelerators： CORDIC trigonometric accelerator and FMAC filter accelerator for enhanced DSP performance.
Ample Memory： 128KB Flash (with ECC) and 32KB SRAM (including 10KB CCM core‑coupled memory).
Rich Analog Peripherals： 2x 12‑bit ADCs (23 channels, 16‑bit oversampling support), 4x 12‑bit DAC channels.
Multiple Communication Interfaces： USART, I2C, SPI, I2S, CAN, etc.. Onboard CH340N USB‑to‑UART, Type‑C for power and programming.
Wide Operating Voltage： 1.71V to 3.6V, industrial temperature range -40℃ to +85℃.
STM32G431CBU6 Applications
Motor control: drone ESCs, robotic joints, industrial servos
Digital power: switched‑mode power supplies, inverters, EV chargers
Industrial automation: PLCs, sensors, process control
IoT nodes: data acquisition, edge computing
Embedded learning: ARM Cortex‑M4 development, motor control algorithms
STM32G431CBU6 Key Advantages
Hardware‑accelerated motor control： Integrated op‑amps, comparators, and dedicated motor timers reduce external components and BOM cost.
Math accelerators boost algorithm efficiency： CORDIC and FMAC accelerate trigonometric and filtering operations, significantly improving FOC and other motor control algorithms.
Cost‑effective core board design： Compact third‑party boards (e.g., WeAct) offer Type‑C power/programming, 2×24‑pin expansion, and SWD debugging for rapid prototyping.
Mature ecosystem support： Compatible with STM32CubeIDE, Keil, PlatformIO, etc., with extensive motor control libraries and examples from ST.
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FAQ
1. What is the STM32G431CBU6, and where is it positioned in the STM32 family? The STM32G431CBU6 is a mixed‑signal high‑performance microcontroller from STMicroelectronics' STM32G4 series, built around an Arm® Cortex®‑M4 core with FPU and DSP extensions running at up to 170 MHz, in a UFQFPN‑48 package. It integrates a rich set of precision analog peripherals (op‑amps, comparators, 12‑bit ADCs and DACs) together with advanced digital control timers on a single chip, purpose‑built for applications that blend accurate analog signal conditioning with real‑time control, such as digital power supplies, motor drives, and industrial sensors.
2. What are the key specifications of the STM32G431CBU6? It operates at 170 MHz, provides 128 KB Flash, 32 KB SRAM, and an additional 10 KB of CCM (Core Coupled Memory) SRAM for zero‑wait‑state real‑time data access. Analog features include multiple rail‑to‑rail op‑amps, ultra‑low‑power comparators, two 12‑bit 5 Msps ADCs, and two 12‑bit DACs. It also includes a high‑resolution timer (HRTIM), a USB‑C power‑delivery and communication interface, and an FDCAN controller.
3. Is the UFQFPN‑48 package (7 mm × 7 mm) difficult to solder? Is it suitable for low‑volume hand assembly? The UFQFPN‑48 is a QFN package with all pins hidden underneath; it requires reflow soldering or a hot‑air station—manual soldering with an iron is not feasible. It is ideal for automated SMT production and significantly saves PCB space. For prototyping, it is strongly recommended to first develop and debug on a NUCLEO‑G431KB board, and then port the code to the QFN chip once the hardware design is finalized.
4. What can the built‑in op‑amps and comparators do? Can they eliminate external analog chips? The on‑chip rail‑to‑rail op‑amps can directly process small signals from current‑sense resistors, Hall sensors, or thermocouples, performing amplification, filtering, and offset adjustment without external op‑amp ICs. The comparators are commonly used for over‑current protection, zero‑crossing detection, and voltage‑threshold monitoring. All of this can be handled internally, significantly reducing BOM cost and PCB area.
5. What can the USB‑C interface do on the STM32G431CBU6? 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.
6. What is the high‑resolution timer (HRTIM), and what role does it play in digital power supplies? The HRTIM is a high‑resolution timer offering PWM resolution down to 184 ps. In digital power and motor control, it generates highly precise and flexible PWM waveforms supporting various topologies (LLC, half‑bridge, full‑bridge). The high resolution enables finer output‑voltage or current adjustments, resulting in more stable and responsive control loops.
7. How does the on‑chip FDCAN controller differ from traditional CAN 2.0? FDCAN (Flexible Data‑Rate CAN) is backward‑compatible with CAN 2.0 while supporting higher data rates (up to 5 Mbps) and larger payloads (up to 64 bytes). This provides significantly higher real‑time throughput than classic CAN, making it ideal for industrial automation, vehicle networks, and robotics that demand fast and reliable communication.
8. What is the power consumption of the STM32G431CBU6? Is it suitable for battery‑powered devices? Built on an advanced 90 nm process, its run‑mode current is approximately 100 µA/MHz. It also supports multiple low‑power modes (Sleep, Stop, Standby), with Standby current dropping to the microamp 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.
9. What development tools are needed for the STM32G431CBU6, 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 for digital power and motor control are also provided.
10. If I later need more analog channels or larger memory, what upgrade options are available? If 128 KB Flash or 42 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‑64 or LQFP‑100 packages are available. Because all these devices belong to the STM32G4 family, code and hardware designs can be highly reused, minimizing migration effort.