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 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 uses 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.
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Supplies external microcontroller
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Integrated reset function
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Reset external microcontroller
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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 5V and 3.3V microcontrollers
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Dual H-Bridge for 2-phase stepper motors
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Programmable peak-current up to 1.6A using a 5-bit current DAC
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Integrated watchdog function
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Flap/valve control in climate control facilities
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