Design Win

Compact, configurable and customizable reference design for battery-operated brushless power tools based on STM32G431 and STDRIVE101

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Product overview


The STDES-PTOOL3A reference design is a compact system designed to control a BLDC/PMSM motor in a handheld battery powered tool, delivering power up to 250W.

It works on the standard set of inputs such as throttle to control the motor torque/speed.

The board can be connected to a suitable 24V/250W BLDC or PMPM power tool motor. More peak power can be delivered with heatsink or with arrangement for circulating air to achieve better power dissipation.

This reference design is ideal for high-performance motor control employed in power tools such as drill machines, grinder, disc cutters, circular saws, leaf blowers, handheld mowers.

Small form factor and ample compute power make it suitable even for application such as drones, wheelchairs, home appliances and robotic platforms.

The board comprises a high performance STM32G431RB MCU featuring integrated op amps and comparators especially optimized for motor control applications along with a triple half bridge gate driver controlling six low voltages high current MOSFETS.

STM32 G4 series MCU also hosts the CORDIC a hardware accelerator designed to speed up the calculation of certain mathematical functions involving vectors and trigonometric functions.

The accelerator is particularly useful in motor control applications.

The MCU features multiple ADC peripherals thereby enabling simultaneous sampling of motor phase currents.

The board has the capability to use both six-step and FOC algorithm available in ST's MCSDK FW library. This ensures high performance of six-step and field oriented control (FOC) of the motor.

  • All features

    • Input voltage from 12 to 24 V dc(Input voltage customizable to 36V with change in resistors, up to 8S batteries)
    • Output RMS current up to 20 AMP
    • The board comprises the following key devices:
      • STM32G431RB: A high-performance Arm®-based Cortex®-M4 32-bit MCU+FPU with integrated op amps and comparators in LQFP 64 (10x10mm) package
      • STDRIVE101: Triple half-bridge high-voltage gate driver in VFQFPN 4x4 with inbuilt regulator and protection features
      • STL220N6F7: Six N-channel 60 V, 0.014 Ω typ., 120 A, STripFET F7 power MOSFET in a PowerFLAT 5x6 package
      • L6981: 1.5 A synchronous step-down converter in a PowerSO-8 package
      • LDL112: 1.2A low quiescent current LDO with reverse current protection in a SO8-batwing package
      • ESDALC6V1-1U2: Single line low capacitance TransilTM for ESD protection is a precision 500 mA regulator in DPAK package
      • TSV911A: Single, dual, and quad rail to rail input/output 8MHz op-amp
      • TS861: Rail to rail micropower Bi-CMOS comparators
      • BAT54: Small signal Schottky diodes
      • BAT30F4: 30V Schottky barrier diodes in a 0201 package
    • Hardware features enabling efficient motor control options
      • Sensor less three-shunt vector (FOC) algorithm (default)
      • Single-shunt vector (FOC) algorithm
      • Digital hall sensors input
      • Back EMF sensing
      • Bus voltage sensing
      • Sensored or sensorless 6 step algorithm
    • Empowered with feature rich STM32 motor control ecosystem for permanent magnet synchronous motors (PMSM), brushless DC motors (BLDC)
      • Wide configurability via motor control library, associated GUI, and profiler
      • Tuning of drive dynamics
      • Selection of operating parameters such as switching frequency
      • Other parameter values for nominal and fault conditions: over current threshold
      • Torque or speed mode operation
    • Fully protected
      • Overcurrent protection
      • Undervoltage lockout
      • Thermal shutdown
    • Serial wire debug (SWD) port for debugging/programming
    • Option for SPI, UART interface
    • Easy user interface with buttons and trimmer
    • Fault, status LEDs and interface for external LED for illumination
    • Test land areas on the board for monitoring important signals or DAC outputs for debugging

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade WEEE Compliant Material Declaration**
CARD Industrial - Yes




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(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors