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.
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Dual H-Bridge for 2-Phase Stepper Motors
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Programmable Peak-Current Up to 2.2 A Continuous (5 A Short Time) Using a 5-bit Current DAC
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On-Chip Current Translator
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Speed and Load Angle Output
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Seven Step Modes from Full Step Up to 32 Micro-Steps
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Fully Integrated Current-Sense
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PWM Current Control with Automatic Selection of Fast and Slow Decay
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Low EMC PWM with Selectable Voltage Slopes
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Full Output Protection and Diagnosis
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Thermal Warning and Shutdown
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Compatible with 5 V and 3.3 V Microcontrollers
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Integrated 5 V Regulator to Supply External Microcontroller
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Integrated Reset Function to Reset External Microcontroller
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Integrated Watchdog Function
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