Introduction

The AMIS−30521/NCV70521 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. The AMIS−30521/NCV70521 contains a current−translation table. It 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.

Features

• Dual H−Bridge for 2 Phase Stepper Motors

• Programmable Peak−Current Up to 1.2 A Continuous (1.5 A Short Time), Using a 5−Bit Current DAC

• On−Chip Current Translator

• SPI Interface

• Speed and Load−Angle Output

• 7 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 Flyback Diodes

• Full Output Protection and Diagnosis

• Thermal Warning and Shutdown

• Digital IO’s Compatible with 5 V and 3.3 V Microcontrollers

• NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes

• These are Pb−Free Devices*

NCV70521属于集成电路（IC） > 电机驱动器，控制器。安森美半导体公司制造生产的NCV70521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。