The AMIS-30422 is a micro-stepping stepper motor bridge controller for large current range bipolar applications. The chip interfaces via a SPI interface with an external controller in order to control two external power NMOS H-bridges. It has an on-chip voltage regulator, current sensing, self adapting PWM controller and pre-driver with smart slope control switching allowing the part to be EMC compliant with industrial and automotive applications. It uses a proprietary PWM algorithm for reliable current control.
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Dual H-bridge pre-drivers for two phase stepper motors
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Programmable current via SPI
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On-chip current translator
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Speed and load angle output
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9 step modes from full step up to 128 microsteps
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Current sense via two external sense resistors
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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 3.3 V microcontrollers
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Integrated 3.3 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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