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. The AMIS?30522 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.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. The AMIS?30522 is intended for use in industrial
applications.

? 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 Fly?back Diodes
? Full Output Protection and Diagnosis
? Thermal Warning and Shutdown
? Digital IO's Compatible with 5 V and 3.3 V Microcontrollers
? Integrated 5 V Voltage Regulator to Supply an External Microcontroller
? Integrated Reset Function to Reset External Microcontroller
? Integrated Watchdog Function
? NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes
? These are Pb?Free Devices