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

A3981屬于集成電路（IC） > 電機驅(qū)動器，控制器。Allegro MicroSystems制造生產(chǎn)的A3981電機驅(qū)動器，控制器產(chǎn)品屬于電機驅(qū)動器和控制器電源管理集成電路 (PMIC) 系列，可用于控制或操作從某電源施加到電機或相關機電執(zhí)行器的電源。所實現(xiàn)的具體功能和特性集根據(jù)預期負載和預期應用的特性有很大差異，范圍從用于有刷電機的簡單開環(huán)速度控制到基于步進電機的高級閉環(huán)運動控制。