AMIS30421C4211RG

The AMIS30421 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 2-Phase Stepper Motors
• Programmable Current via SPI
• On-chip Current Translator
• SPI Interface
• Speed and Load Angle Output
• 8 Step Modes from Full Step up to 64 Micro-Steps
• 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
• These Devices are Pb-Free and are RoHS Compliant