DRV8821

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SLVS912E – JANUARY 2009 – REVISED AUGUST 2010

TERMINAL FUNCTIONS

NAME

NO.

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 to GND with several 0.1-mF, 35-V ceramic capacitors.

V3P3

16

-

3.3 V regulator output

Bypass to GND with 0.47-mF, 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-mF capacitor between CP1 and CP2

CP2

8

IO

VCP

9

IO

Charge pump storage capacitor

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 A outputs, logic low to enable.

Active-low reset input initializes the indexer logic and disables the

ABRESETn

40

I

Motor AB reset input

H-bridge outputs for motor A.

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 1, 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 1, 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 Boutputs, logic low to enable.

Active-low reset input initializes the indexer logic and disables the

CDRESETn

28

I

Motor CD reset input

H-bridge outputs for motor B.

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 2, 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 2, 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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