STMicroelectronics STEVAL-PTOOL4A

Overview

STEVAL-PTOOL4A from STMicroelectronics is a compact, customizable reference design for battery-powered BLDC/PMSM motor control in handheld power tools, built around the STM32G473CET6 MCU and STDRIVE101 triple half-bridge gate driver. It supports 12–28 V DC input (nominal 21 V), delivers up to 20 A RMS output current, and enables sensorless or sensored FOC/six-step control with hardware overcurrent protection, bus voltage sensing, and thermal monitoring.

For engineers reviewing the STEVAL-PTOOL4A datasheet, STEVAL-PTOOL4A pinout, STEVAL-PTOOL4A application, or STEVAL-PTOOL4A equivalent, this board provides verified signal conditioning paths for three-phase current and back-EMF sensing, configurable motor dynamics tuning via MCSDK, SWD debugging, CAN/UART/SPI interfaces, and daughterboard expansion for MEMS or memory - all critical for rapid prototyping of 250 W-class cordless tools.

Technical Context

The board implements a full 3-phase inverter topology using six STL220N6F7 60 V / 120 A N-channel MOSFETs driven by STDRIVE101's independent high- and low-side outputs with integrated bootstrap regulation and fault reporting. The STM32G473CET6 MCU executes real-time motor control algorithms using dedicated peripherals: three independent ADCs for simultaneous shunt-based phase current sampling, additional ADC channels for back-EMF and throttle input, and hardware timers with dead-time insertion for PWM generation.

Power management includes an L6981NDR 38 V / 1.5 A synchronous buck converter generating +5 V from VBATT+, an LDL112 LDO delivering +3.3 V with reverse-current protection, and discrete Schottky diodes (BAT54K/BAT54SW) for bootstrap and BEMF clamping. Signal conditioning uses TSV912IQ2T dual op-amps for differential amplification of shunt voltages and BEMF feedback.

Key Specifications

Availability

STEVAL-PTOOL4A is available at Aetrix Electronics and suitable for cordless power tool development, industrial BLDC motor control prototyping, and PMSM-based e-mobility subsystem validation requiring stable component supply, traceable sourcing, and long-term design-in support.

Supply support for STEVAL-PTOOL4A 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, analog ICs, power devices, and sensors for automotive, industrial, and consumer applications.

This board belongs to ST's STEVAL evaluation platform family, specifically engineered to accelerate adoption of STM32 motor control solutions in battery-operated, high-efficiency motion systems - emphasizing configurability, safety, and ecosystem integration with MCSDK and ST Motor Profiler.

FAQ

What motor types and power levels does STEVAL-PTOOL4A support?

STEVAL-PTOOL4A is validated for BLDC and PMSM motors up to 250 W continuous power at 21 V input, supporting peak loads with thermal management. It accommodates motors with rated currents ≤20 A RMS and operates with 5S–7S Li-ion battery packs. The board's 3-shunt current sensing and back-EMF circuitry enable precise field-oriented control across speed ranges including zero-speed torque delivery via ST's ZeST algorithm.

How is motor control firmware configured and updated?

Firmware is developed using ST's Motor Control SDK (MCSDK) v6.x with graphical configuration tools and real-time profiler. Users select control mode (FOC/six-step), tuning parameters (PWM frequency, current loop gains), and sensor interface (Hall/encoder/analog throttle) via JSON configuration files. Code is flashed via SWD using STM32CubeProgrammer or IDE debuggers; runtime parameter adjustment is supported over UART or CAN.

Does STEVAL-PTOOL4A include hardware protection against overcurrent or thermal faults?

Yes - it features hardware-level overcurrent detection through STDRIVE101's FAULT pin tied to STM32G473's EXTI line, enabling immediate PWM disable within <1 µs. Thermal protection uses an onboard NTC thermistor (NTC1) feeding ADC channel TEMP_FB, while undervoltage lockout is implemented via the L6981NDR's EN pin and MCU VDD monitoring. All protections trigger LED indicators and can be logged via UART/CAN.

Can STEVAL-PTOOL4A be extended with additional sensors or communication modules?

Yes - it provides J13 (5-pin Hall sensor header), J5 (5-pin encoder/Hall interface), J14 (2-pin throttle/trigger), and J16 (3-pin external LED), plus a dedicated 10-pin daughterboard connector (J11) for MEMS inertial sensors or external memory. CAN transceiver pins are routed to J4, and SPI/UART/I²C signals are accessible on J2 and test points, enabling seamless integration of IMUs, GPS, or wireless modules.