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.

• Dual H-bridge pre-drivers for two phase stepper motors
• Programmable current via SPI
• On-chip current translator
• SPI interface
• Speed and load angle output
• 9 step modes from full step up to 128 microsteps
• Current sense via two external sense resistors
• PWM current control with automatic selection of fast and slow decay
• Low EMC PWM with selectable voltage slopes
• Full output protection and diagnosis
• Thermal warning and shutdown
• Compatible with 3.3 V microcontrollers
• Integrated 3.3 V regulator to supply external microcontroller
• Integrated reset function to reset external microcontroller
• Integrated watchdog function