Description

The A3981 is a flexible microstepping motor driver with built-in translator for easy operation. It is a single-chip solution, designed to operate bipolar stepper motors in full-, half-, quarter- and sixteenth-step modes, at up to 28 V and ±1.4 A. The A3981 can be controlled by simple Step and Direction inputs, or through the SPI-compatible serial interface that also can be used to program many of the integrated features and to read diagnostic information.

Features and Benefits

? Peak motor current up to ±1.4 A, 28 V

? Low RDS(on) outputs, 0.5 Ω source and sink, typical

? Automatic current decay mode detection/selection

? Mixed, Fast, and Slow current decay modes

? Synchronous rectification for low power dissipation

? Internal OVLO, UVLO, and Thermal Shutdown circuitry

? Crossover-current protection

? Short circuit and open load diagnostics

? Hot and cold thermal warning

? Stall detect features

? SPI-compatible or simple Step and Direction motion control

? Highly configurable via SPI-compatible serial interface

Applications

? Automotive stepper motors

? Engine management

? Headlamp positioning