DRV8821 datasheet(7/17 Pages) TI

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FUNCTIONAL DESCRIPTION

PWM Motor Drivers

A OU T 1

A OU T2

BOU T1

B OU T2

Step

Motor

A IS EN

B ISEN

APH A SE

Pre-

drive

Pre-

drive

VC P, VGD

PW M

V CP, VGD

PW M

A BVR EF

OC P

A BD EC A Y

B EN BL

DAC

A = 5

A I[2:0]

B I[2:0]

AEN B L

BPH A SE

A I[2:0]

From Indexer Logic

DRV8821

www.ti.com.......................................................................................................................................... SLVS912B – JANUARY 2009 – REVISED SEPTEMBER 2009

The DRV8821 contains four H-bridge motor drivers with current-control PWM circuitry. A block diagram showing

drivers A and B of the motor control circuitry (as typically used to drive a bipolar stepper motor) is shown below.

Drivers C and D are the same as A and B (though the Rds(on) of the output FETs is different).

Figure 1. Block Diagram

Note that there are multiple VM motor power supply pins. All VM pins must be connected together to the motor

supply voltage.

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