ON Semiconductor has extended its bipolar stepper motor control family to include two new serial peripheral interface (SPI) versions of a motor driver capable of peak currents up to 800 mA and for use with an external microcontroller for added flexibility.
The AMIS-30511 and AMIS-30512 eliminate the need for many external components, reducing system cost and bill of materials.
Both of the new mixed-signal ICs contain 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 short durations. Each also allows a host microcontroller to detect blocked rotor and end-of-run conditions without additional switches, Hall sensors or optical encoders. In addition to stall detection, these functions allow the designer to program the microcontroller to calculate rotor position and to dynamically adjust current or speed as required to prevent step loss. This capability eliminates noise and vibration at end-stops and improves motion-control accuracy and reliability without additional components.
The 30512 contains a 5 V regulator to supply both internal logic and up to 50 mA for external components, such as a microprocessor. It also has watchdog logic circuitry to prevent an external microprocessor from 'hanging up'.
Typical uses for the ICs include security cameras, building and industrial automation, motor control, textile processing, process equipment, robotics, HVAC and base station control and status.
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