A4979 Series

By Allegro MicroSystems, LLC 174

A4979 Series

Allegro MicroSystems' A4979 is a flexible microstepping motor driver IC with built-in translator for easy operation. It is a single-chip solution, designed to operate bipolar stepper motors in full-, half-, quarter- and sixteenth-step modes, at up to 50 V and 1.5 A. This device represents the next generation in the family of high voltage stepper motor drivers. It is intended to provide a feature rich replacement for the A3987 while also maintaining simple control options (step/direction).

  • Highly configurable through the SPI interface
  • Diagnostic outputs provide user with detailed fault information
  • Automatic current decay selection automatically chooses the amount of fast decay to reduce ripple and to provide improved low current accuracy
  • High supply voltage up to 50 V
  • Custom current profiles can be programmed for matching current to BEMF profile
  • Shorted and open load detection prevents damage to IC and surrounding circuitry
  • Locked rotor detection prevents damage to motor reducing maintenance costs

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