原标题：On Semi AMIS-30532-D微步进马达控制方案

　　On Semi 公司的AMIS-30532-D是微步进的步马达驱动器,它通过I/O引脚与SPI接口和外接 MCU连接,可用于双极步进马达控制. AMIS-30532-D包括有电压稳压器,重置输出和看门狗重置.可编程峰值电流高达1.6A,和5V与3.3V MCU兼容.本文介绍AMIS-30532-D主要特性,方框图,典型应用电路和所用元器件.

　　The AMIS-30532 is a micro-stepping stepper motor driver for bipolar stepper motors. The chip is connected through I/O pins and an SPI interface with an external microcontroller. It has an on-chip voltage regulator, reset-output and watchdog reset, able to supply peripheral devices. The AMIS-30532 contains a current-translation table and takes the next micro-step depending on the clock signal on the NXT input pin and the status of the DIR (=direction) register or input pin. The chip provides a so-called speed and load angle output. This allows the creation of stall detection algorithms and control loops based on load-angle to adjust torque and speed. It is using a proprietary PWM algorithm for reliable current control. The AMIS-30532 is implemented in I2T100 technology, enabling both high-voltage analog circuitry and digital functionality on the same chip. The chip is fully compatible with the automotive voltage requirements. The AMIS-30532 is ideally suited for general-purpose stepper motor applications in the automotive, industrial, medical, and marine environment. With the on-chip voltage regulator it further reduces the BOM for mechatronic stepper applications.

　　AMIS-30532-D主要特性:

　　Dual H-Bridge for 2-Phase Stepper Motors

　　Programmable Peak-Current up to 1.6 A Continuous (3.0 A Short Time) using a 5-bit Current DAC

　　On-Chip Current Translator

　　SPI Interface

　　Speed and Load Angle Output

　　Seven Step Modes from Full-Step Up to 32 Micro-Steps

　　Fully Integrated Current-Sense

　　PWM Current Control with Automatic Selection of Fast and Slow Decay

　　Low EMC PWM with Selectable Voltage Slopes

　　Active Fly-Back Diodes

　　Full Output Protection and Diagnosis

　　Thermal Warning and Shutdown

　　Compatible with 5 V and 3.3 V Microcontrollers

　　Integrated 5 V Regulator to Supply External Microcontroller

　　Integrated Reset Function to Reset External Microcontroller

　　Integrated Watchdog Function

　　图1.AMIS-30532-D方框图

　　图21.AMIS-30532典型应用电路图

　　应用电路元件表: