●The AMIS-30532 is a micro-stepping stepper motor driver for bipolar stepper motors. The chip is connected through I/O pins and an 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-30532 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-30532 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-30532 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.
●Features
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● Dual H-Bridge for 2-phase stepper motors
● Programmable peak-current up to 1.6 A continuous (3.0 A short time) 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 5 V and 3.3 V microcontrollers
● Integrated 5 V regulator to supply external microcontroller
● Integrated reset function to reset external microcontroller
● Integrated Watchdog Function
