Datasheet

AOUT1
AOUT2
BOUT1
BOUT2
Step
Motor
VMA
VMB
ISENA
ISENB
VREF
Pre-
drive
Pre-
drive
VCP
VM
VM
+
-
PWM
VCP
+
-
PWM
DAC
DAC
A=8
A=8
Control / Indexer
Logic
DECAY
RCB
RCA
VGD
VGD
+
+
-
-
DRV8818
www.ti.com SLVSAX9C –SEPTEMBER 2011–REVISED NOVEMBER 2013
FUNCTIONAL DESCRIPTION
PWM H-Bridge Drivers
DRV8818 contains two H-bridge motor drivers with current-control PWM circuitry, and a microstepping indexer. A
block diagram of the motor control circuitry is shown below.
Figure 1. Motor Control Circuitry
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