Datasheet

Charge
Pump and
Gate Drive
Regulator
Thermal
Shut down
AOUT1
AOUT2
BOUT1
BOUT2
GND
ABVREF
0. 1µF
16V
0.01µF
35V
+24
Step
Motor
VM
CP1
CP2
VCP
AISEN
BISEN
VCP
OCP Oscillator
COUT1
COUT2
DOUT1
DOUT2
Step
Motor
CI SEN
DISEN
UVLO
RESET
VGD
ABSTEP
ABDIR
ABENBLn
ABUSM0
ABUSM1
Dig.
VCC
V3P3
3.3V
Regulator
0.47µF
6.3V
CDVREF
PWM H-bridge
driver A
PWM H-bridge
driver B
PWM H-bridge
driver C
PWM H-bridge
driver D
I ndexer
Logic
ABDECAY
CDSTEP
CDDIR
CDENBLn
CDUSM0
CDUSM1
CD DEC AY
ABRESETn
CDRESETn
+24+24
0. 1µF, 35V
·
·
VM
+24+24
·
0. 1µF, 35V
0. 1µF, 35V
VM
+24+24
·
0. 1µF, 35V
VM
+24+24
·
DRV8821
SLVS912H –JANUARY 2009–REVISED AUGUST 2013 www.ti.com
FUNCTIONAL BLOCK DIAGRAM
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