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.

• 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