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AMIS30512
Microstepping Motor Driver
AMIS-30512
Micro-Stepping Motor Driver
Introduction The AMIS−30512 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. The AMIS−30512 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−30512 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−30512 is ideally suited for general−purpose stepper
motor applications in the automotive, industrial, medical, and marine
environment.
Key Features Dual H−Bridge for 2−phase Stepper Motors Programmable Peak−current up to 800 mA 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 3.3 V Microcontrollers, 5 V Tolerant Inputs Integrated 5 V Regulator to Supply External Microcontroller Integrated Reset Function to Reset External Microcontroller Integrated Watchdog Function
