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属于集成电路（IC） > 电机驱动器，控制器。Allegro MicroSystems制造生产的A3981电机驱动器，控制器产品属于电机驱动器和控制器电源管理集成电路 (PMIC) 系列，可用于控制或操作从某电源施加到电机或相关机电执行器的电源。所实现的具体功能和特性集根据预期负载和预期应用的特性有很大差异，范围从用于有刷电机的简单开环速度控制到基于步进电机的高级闭环运动控制。