STMicroelectronics B-G431B-ESC1

Overview

B-G431B-ESC1 from STMicroelectronics is a compact, detachable electronic speed controller (ESC) development kit built around the STM32G431CB Arm® Cortex®-M4 MCU, L6387 high-side/low-side gate driver, and STL180N6F7 60 V / 120 A N-channel power MOSFETs. It implements sensorless field-oriented control (FOC) or 6-step commutation for single 3-phase BLDC/PMSM motors, supports active braking, overcurrent/thermal protection, and accepts 3S–6S LiPo input (11–25.2 V). It targets drone propulsion systems requiring real-time motor torque regulation and air-cooled peak current up to 40 A.

For engineers reviewing the B-G431B-ESC1 datasheet, B-G431B-ESC1 pinout, B-G431B-ESC1 application, or B-G431B-ESC1 equivalent, key selection considerations include its integrated ST-LINK/V2-1 debugger, UART/CAN/PWM command interface support, 3-shunt current sensing architecture, BEC 5 V output for flight controllers, and compatibility with X-CUBE-MCSDK motor control firmware.

Technical Context

The B-G431B-ESC1 integrates a full hardware reference design for closed-loop motor control: the STM32G431CB executes FOC algorithms using two 5 Msps 12-bit ADCs, CORDIC/FMAC accelerators, and three dedicated motor timers (TIM1, TIM15, TIM16), while the L6387 drives external MOSFET half-bridges with interlocking logic to prevent shoot-through. The board implements analog signal conditioning for BEMF sensing (PA4/PA12/PB11), shunt-based current feedback (PA1/PA5/PB0/PB19), and NTC-based thermal monitoring (PB14).

Communication is implemented via on-board CAN transceiver (J1, UAVCAN-compliant), UART (PB3/PB4), and PWM input (PA15, 5 V tolerant, 1060–1860 µs pulse width range), with firmware-controllable 120 Ω CAN termination (PC13). The daughterboard provides USB-powered ST-LINK/V2-1 debugging, SWD access (PA13/PA14), and BEC 5 V output - active only when daughterboard is attached.

Key Specifications

Availability

B-G431B-ESC1 is available at Aetrix Electronics and suitable for drone propulsion systems, R/C vehicle motor control, and PMSM servo drive prototyping requiring stable component supply, rapid firmware iteration, and production-ready ESC reference design validation.

Supply support for B-G431B-ESC1 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 devices, sensors, and analog ICs for industrial, automotive, and consumer applications.

The B-G431B-ESC1 belongs to ST's STM32 Discovery kit family, engineered specifically to accelerate development of high-efficiency, sensorless motor control systems for drones and lightweight electric vehicles - emphasizing integration, debug readiness, and field-deployable protection features.

FAQ

Does B-G431B-ESC1 support sensored FOC with Hall or encoder inputs?

Yes. The kit includes dedicated J8 solder pads with 5 V and GND for Hall effect or incremental encoder connection. The STM32G431CB's GPIOs (PB4–PB8, PB11) are routed for HALL A/B/Z or encoder A/B signals, and ST MC Workbench supports configuration for sensored FOC operation without hardware modification.

What is the role of the daughterboard, and can it be removed during operation?

The daughterboard hosts the ST-LINK/V2-1 debugger/programmer, USB interface, BEC 5 V regulator, user button (PC11), potentiometer (PB12), and two LEDs. It can be detached to reduce size/weight for final deployment; when removed, SWD programming shifts to J4 pads (PA13/PA14), and BEC output becomes unavailable.

Is CAN communication functional without external power on J1?

Yes. When external 5.0–5.5 V is applied to J1's VBUS pin, the board generates internal 3.3 V for the STM32G431CB and CAN transceiver - enabling CAN communication even if the main LiPo battery (J5/J6) is disconnected or depleted, supporting fail-safe telemetry in drone systems.

What firmware is preloaded, and how is initial programming performed?

No firmware is preloaded. Initial programming requires connecting the daughterboard via USB to a PC running STM32CubeIDE or IAR EWARM, then loading X-CUBE-MCSDK-generated motor control firmware. ST MC Workbench is used for real-time parameter tuning, motor identification, and oscilloscope-style current/speed waveform capture over UART.