Datasheet

xOUT1

xOUT2

xISEN

From Logic

Pre-

drive

VCP, VM

PWM

OCP

Optional

Step

Motor

DAC

Comparator

CONFIG

xVREF

From Indexer

DRV8834

SLVSB19C –FEBRUARY 2012–REVISED JUNE 2013

www.ti.com

FUNCTIONAL DESCRIPTION

Device Configuration

The DRV8834 supports two configurations: phase/enable mode, where the outputs are controlled by phase

(direction) and enable signals for each H-bridge, and indexer mode, which allow control of a stepper motor using

simple step and direction inputs.

DC motors can only be controlled in phase/enable mode; indexer mode is not applicable to DC motors.

Stepper motors can be controlled using either phase/enable load, or indexer mode.

The device is configured to be controlled either way using CONFIG pin. Logic HIGH on the CONFIG pin puts the

device in the STEP/DIR mode; logic LOW lets the motor to be controlled using the xPHASE/xENBL pins.

The state of the CONFIG pin is latched at power-up, and also whenever exiting sleep mode. CONFIG has an

internal pull-down resistor.

PWM Motor Drivers

DRV8834 contains two identical H-bridge motor drivers with current-control PWM circuitry. A block diagram of the

circuitry is shown below:

Figure 1. Motor Control Circuitry

Current Control

The current through the motor windings may be regulated by a fixed-frequency PWM current regulation (current

chopping).

Product Folder Links: DRV8834