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: