原标题：On Semi AMIS-30542微步进马达驱动方案

　　On Semi公司的 AMIS-30542是微步进的步进马达驱动器,通过I/O引脚和SPI接口与外接MCU连接. AMIS-30542集成了片上电压稳压器,重置输出和看门狗重置,具有两个用于两相步进马达的H桥,可编程峰值电流高达2.2A,和5V与3.3V MCU兼容.本文介绍AMIS-30542主要特性,方框图以及应用电路和外接元件列表.

　　The AMIS−30542 is a micro−stepping stepper motor driver for bipolar stepper motors. The chip is connected through I/O pins and a SPI interface with an external microcontroller. It has an on−chip voltage regulator, reset−output and watchdog reset, able to supply peripheral devices. AMIS−30542 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−30542 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−30542 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−30542主要特性:

　　Dual H−Bridge for 2−Phase Stepper Motors

　　Programmable Peak−Current Up to 2.2 A Continuous† (5 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

　　These Devices are Pb−Free and are RoHS Compliant

　　图1.AMIS−30542方框图

　　图2.AMIS−30542典型应用电路

　　外接元件表: