Step-Motor Controller Family Adds SPI Versions

Extending the company’s bipolar stepper motor control family are two SPI versions of a motor driver capable of peak currents up to 800 mA and suitable for use with an external microcontroller. The AMIS-30511 and AMIS-30512 integrate two embedded H-bridges that can drive two-phase stepper motors with sustained peak currents up to 400 mA and maximum currents up to 800 mA for a short duration. Each also allows a host microcontroller to detect blocked rotor and end-of-run conditions without additional switches, Hall sensors, or optical encoders. The 30512 adds a 5V regulator to supply both internal logic and up to 50 mA for external components. The chip also packs watchdog logic circuitry. Available in 24 pin SOIC packages, prices for the AMIS-30511 and AMIS-30512 start at $3.81 and $4.18 each/1,000, respectively. ON SEMICONDUCTOR, Phoenix, AZ. (800) 282-9855.