DRV8821_16 Datasheet, PDF (11/32 Pages) Texas Instruments – Dual Stepper Motor Controller and Driver

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Feature Description (continued)
From Indexer Logic
AEN B L
APH A SE
A BD EC A Y
A I[2:0]
A I[2:0]
A BVR EF
DRV8821
SLVS912J – JANUARY 2009 – REVISED JANUARY 2016
VCP, VGD
OCP
Pre-
driv e
PW M
3
DAC
3
OCP
-
+
A =5
VM
VM
A OU T1
A OU T2
Step
Motor
A IS EN
B EN BL
BPH A SE
B I[2:0]
V CP, VGD
OCP
Pre-
driv e
PW M
DAC
3
OCP
-
+
A =5
VM
VM
BOU T1
B OU T2
BISEN
Figure 10. Block Diagram
Note that there are multiple VM motor power supply pins. All VM pins must be connected together to the motor
supply voltage.
7.3.2 Current Regulation
The PWM chopping current is set by a comparator which compares the voltage across a current sense resistor
connected to the xISEN pins, multiplied by a factor of 5, with a reference voltage. The reference voltage is input
from the xVREF pin.
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