DRV8823_16 Datasheet, PDF (10/32 Pages) Texas Instruments – 4-Bridge Serial Interface Motor Driver

DRV8823
SLVS913E – JANUARY 2009 – REVISED JANUARY 2016
www.ti.com
7 Detailed Description
7.1 Overview
The DRV8823 is a dual stepper motor driver solution for applications that require independent control of two
different motors. The device integrates four NMOS H-bridges, a microstepping indexer, and various fault
protection features. The DRV8823 can be powered with a supply voltage between 8 and 32 V, and is capable of
providing an output current up to 1.5 A full scale. Actual full-scale current will depend on ambient temperature,
supply voltage and PCB ground size.
A serial data interface is included to control all functions of the motor driver. Current regulation through all four H-
bridges is achieved using three register bits per H-bridge. The three register bits are used to scale the current in
each bridge as a percentage of the full-scale current set by VREF input pin and sense resistor. The current
regulation is configurable with two different decay modes, fixed slow and mixed.
The gate drive to each FET in all four H-Bridges is controlled to prevent any cross-conduction (shoot through
current) during transitions.
10
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