Datasheet

DRV8821
www.ti.com SLVS912H –JANUARY 2009–REVISED AUGUST 2013
TERMINAL FUNCTIONS
NAME NO. I/O
(1)
DESCRIPTION EXTERNAL COMPONENTS OR CONNECTIONS
POWER AND GROUND
VM 1,2, Connect all VM pins together to motor supply voltage.
- Motor supply voltage (multiple pins)
(4 pins) 23, 24 Bypass each VM to GND with a 0.1-µF, 35-V ceramic capacitor.
V3P3 16 - 3.3 V regulator output Bypass to GND with 0.47-μF, 6.3-V ceramic capacitor.
GND 10-15,
- Power ground (multiple pins) Connect all PGND pins to GND and solder to copper heatsink areas.
34-39
CP1 7 IO
Charge pump flying capacitor Connect a 0.01-μF capacitor between CP1 and CP2
CP2 8 IO
VCP 9 IO Charge pump storage capacitor Connect a 0.1-μF, 16 V ceramic capacitor to V
M
MOTOR AB
ABSTEP 45 I Motor AB step input Rising edge causes the indexer to move one step.
ABDIR 43 I Motor AB direction input Level sets the direction of stepping.
ABUSM0 44 I Motor AB microstep mode 0
USM0 and USM1 set the step mode - full step, half step, quarter
step, or eight microsteps/step.
ABUSM1 41 I Motor AB microstep mode 1
ABENBLn 42 I Motor AB enable input Logic high to disable motor AB outputs, logic low to enable.
Active-low reset input initializes the indexer logic and disables the H-
ABRESETn 40 I Motor AB reset input
bridge outputs for motor AB.
ABDECAY 6 I Motor AB decay mode Logic low for slow decay mode, high for mixed decay.
Motor AB current set reference
ABVREF 17 I Sets current trip threshold.
voltage
AOUT1 5 O Bridge A output 1
Connect to first coil of bipolar stepper motor AB, or DC motor
winding.
AOUT2 3 O Bridge A output 2
AISEN 4 - Bridge A current sense Connect to current sense resistor for bridge A.
BOUT1 48 O Bridge B output 1
Connect to second coil of bipolar stepper motor AB, or DC motor
winding.
BOUT2 46 O Bridge B output 2
BISEN 47 - Bridge B current sense Connect to current sense resistor for bridge B.
MOTOR CD
CDSTEP 33 I Motor CD step input Rising edge causes the indexer to move one step.
CDDIR 31 I Motor CD direction input Level sets the direction of stepping.
CDUSM0 32 I Motor CD microstep mode 0
USM0 and USM1 set the step mode - full step, half step, quarter
step, or eight microsteps/step.
CDUSM1 29 I Motor CD microstep mode 1
CDENBLn 30 I Motor CD enable input Logic high to disable motor CD outputs, logic low to enable.
Active-low reset input initializes the indexer logic and disables the H-
CDRESETn 28 I Motor CD reset input
bridge outputs for motor CD.
CDDECAY 19 I Motor CD decay mode Logic low for slow decay mode, high for mixed decay.
Motor CD current set reference
CDREF 18 I Sets current trip threshold.
voltage
COUT1 27 O Bridge C output 1
Connect to first coil of bipolar stepper motor CD, or DC motor
winding.
COUT2 25 O Bridge C output 2
CISEN 26 - Bridge C current sense Connect to current sense resistor for bridge C.
DOUT1 22 O Bridge D output 1
Connect to second coil of bipolar stepper motor CD, or DC motor
winding.
DOUT2 20 O Bridge D output 2
DISEN 21 - Bridge D current sense Connect to current sense resistor for bridge D.
(1) Directions: I = input, O = output, OZ = 3-state output, OD = open-drain output, IO = input/output
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