The AMIS−30543 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. AMIS−30543 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−30543 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−30543 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.