AMIS-30522 Micro-stepping Motor Driver

Data Sheet

1.0 Introduction

The AMIS-30522 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-30522 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-30522 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-30522 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.

2.0 Key Features

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Dual H-Bridge for 2-phase stepper motors

•

Programmable peak-current up to 1.6A 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

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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

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Compatible with 5V and 3.3V microcontrollers

•

Integrated 5V regulator to supply external microcontroller

•

Integrated reset function to reset external microcontroller

•

Integrated watchdog function

3.0 Ordering information

Table 1: Ordering Information

Part No.

Package

Peak Current

Temp. Range

Ordering Code

Tubes

Ordering Code

Tapes

AMIS-30522 ANA

NQFP-32 (7 x 7mm)

1600mA

-40°C…..125°C

0C522-001-XTD

0C522-001-XTP

1

AMI Semiconductor

– June 2007, M-20684-001

www.amis.com