DRV8818_15 Datasheet, PDF (10/31 Pages) Texas Instruments – DRV8818 Stepper Motor Controller IC

DRV8818
SLVSAX9D – SEPTEMBER 2011 – REVISED JANUARY 2015
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8.3 Feature Description
8.3.1 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.
RCA
VGD
VCP
PWM
Pre-
drive
VM
VMA
AOUT1
AOUT 2
+
Step
Motor
-
+-
-
+
A=8
DAC
ISENA
Control / Indexer
Logic
RCB
DECAY
VREF
VGD
VCP
Pre-
drive
PWM
-
+
A=8
DAC
VM
VMB
BOUT 1
BOUT2
ISENB
Figure 6. Motor Control Circuitry
10
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