AMIS-30421 Datasheet | onsemi

Micro-Stepping Stepper Motor Bridge Controller Introduction The AMIS- 30421 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 2 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 pliant with industrial and automotive applications. It uses a proprietary PWM algorithm for reliable current control. The AMIS- 30421 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. The AMIS- 30421 is implemented in a mature technology, enabling fast high voltage analog circuitry and multiple digital functionalities on the same chip. The chip is fully patible with automotive voltage requirements. The AMIS- 30421 is easy to use and ideally suited for large current 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. Key Features - 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 - patible with 3.3 V Microcontrollers - Integrated 3.3 V Regulator to Supply External...