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STSPIN32 prototype boards for cordless power tools

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By Ally Winning


The boards have been based on ST’s highly integrated STSPIN32 motor-control Systems-in-Package. The STEVAL-PTOOL1V1 and STEVAL-PTOOL2V1 evaluation boards offer features meet the requirements of power tools including a small form factor and low standby current. Firmware for six-step motor commutation using Hall-effect rotor-position sensing comes with the boards. The firmware ensures low torque ripple and optimum power efficiency.

The STEVAL-PTOOL1V1 has been designed to ease the development of equipment powered by Li-ion battery packs from two cells (7.4V) to six cells (22.2V). The board has a 70mm x 30mm footprint and can provide up to 15A continuous current. It has a standby current of under 1µA. The board is designed around the STSPIN32F0B motor controller, which integrates an STM32F0* MCU, 3-phase half-bridge gate driver, 12V and 3.3V voltage regulators, an op-amp for current sensing and power-stage protection features such as programmable over-current protection (OCP), cross-conduction prevention and under-voltage lockout (UVLO). The power stage of the board uses ST Power MOSFET N-channel 60V STripFET F7 technology.

The STEVAL-PTOOL2V1 is intended for the development of rquipment with battery sizes from eight cells (29.6V) to 15 cells (55.5V). It can provide up to 19A continuous current. It uses ST’s STSPIN32F0252 motor controller, which has a 3-phase 250V gate driver, an STM32F0* MCU, and a comparator with fast and flexible OCP. The STSPIN32F0252 features a rugged design with output pins that can resist below-ground spikes down to -120V. With on-board bus voltage sensing, the STEVAL-PTOOL2V1 board comes in a form factor of only 77mm x 54mm. The power stage features the ST Power MOSFET N-channel, 80V, STripFET F7 technology.

Both boards feature a potentiometer for speed variation, inputs for trigger and rotation-direction setting, thermal shutdown, and protection against reverse biasing of power-stage outputs. They are supplied with a heatsink already mounted.

More information

www.st.com/stspin-pr

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