1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

28

27

26

25

24

23

22

21

20

ABDECAY

AOUT1

VM

VM

AOUT2

AISEN

ABSTEP

ABUSM0

ABDIR

ABVREF

BISEN

CDVREF

CDDECAY

ABENBLn

V3P3

BOUT2

BOUT1

CDSTEP

CDUSM0

CDDIR

CDENBLn

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

PGND

PGND

PGND

PGND

PGND

PGND

Solder these

pins to copper

heatsink area

PGND

PGND

PGND

PGND

PGND

VCP

CP2

CP1

VM

DOUT2

DISEN

DOUT1

VM

ABUSM1

ABRESETn

CISEN

COUT2

CDRESETn

COUT1

CDUSM1

PGND

Solder these

pins to copper

heatsink area

DRV8821

www.ti.com

SLVS912J – JANUARY 2009 – REVISED JANUARY 2016

5 Pin Configuration and Functions

DCA Package

48-Pin HTSSOP

Top View

Pin Functions

PIN

DESCRIPTION

EXTERNAL COMPONENTS OR CONNECTIONS

NAME

NO.

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-

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.

(1)

Directions: i = input, O = output, OZ = 3-state output, OD = open-drain ouput, IO = input/ouput

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