DRV8824

www.ti.com

SLVSA06E

– OCTOBER 2009 – REVISED AUGUST 2011

Table 1. TERMINAL FUNCTIONS

EXTERNAL COMPONENTS

NAME

PIN

DESCRIPTION

OR CONNECTIONS

POWER AND GROUND

GND

14, 28

-

Device ground

VMA

4

-

Bridge A power supply

Connect to motor supply (8 - 45 V). Both pins

must be connected to same supply.

VMB

11

-

Bridge B power supply

Bypass to GND with a 0.47-

μF 6.3-V ceramic

V3P3OUT

15

O

3.3-V regulator output

capacitor. Can be used to supply VREF.

CP1

1

IO

Charge pump flying capacitor

Connect a 0.01-

μF 50-V capacitor between

CP1 and CP2.

CP2

2

IO

Charge pump flying capacitor

Connect a 0.1-

μF 16-V ceramic capacitor to

VCP

3

IO

High-side gate drive voltage

VM.

CONTROL

Logic high to disable device outputs and

nENBL

21

I

Enable input

indexer operation, logic low to enable. Internal

pulldown.

Logic high to enable device, logic low to enter

nSLEEP

17

I

Sleep mode input

low-power sleep mode. Internal pulldown.

Rising edge causes the indexer to move one

STEP

22

I

Step input

step. Internal pulldown.

Level sets the direction of stepping. Internal

DIR

20

I

Direction input

pulldown.

MODE0

24

I

Microstep mode 0

MODE0 - MODE2 set the step mode - full,

MODE1

25

I

Microstep mode 1

1/2, 1/4, 1/8/ 1/16, or 1/32 step. Internal

pulldown.

MODE2

26

I

Microstep mode 2

Low = slow decay, open = mixed decay,

DECAY

19

I

Decay mode

high = fast decay. Internal pulldown and

pullup.

Active-low reset input initializes the indexer

nRESET

16

I

Reset input

logic and disables the H-bridge outputs.

Internal pulldown.

AVREF

12

I

Bridge A current set reference input

Reference voltage for winding current set.

Normally AVREF and BVREF are connected

to the same voltage. Can be connected to

BVREF

13

I

Bridge B current set reference input

V3P3OUT. A 0.01-

µF bypass capacitor to

GND is recommended.

NC

23

No connect

Leave this pin unconnected.

STATUS

nHOME

27

OD

Home position

Logic low when at home state of step table

Logic low when in fault condition (overtemp,

nFAULT

18

OD

Fault

overcurrent)

OUTPUT

ISENA

6

IO

Bridge A ground / Isense

Connect to current sense resistor for bridge A.

ISENB

9

IO

Bridge B ground / Isense

Connect to current sense resistor for bridge B.

AOUT1

5

O

Bridge A output 1

Connect to bipolar stepper motor winding A.

Positive current is AOUT1

→ AOUT2

AOUT2

7

O

Bridge A output 2

BOUT1

10

O

Bridge B output 1

Connect to bipolar stepper motor winding B.

Positive current is BOUT1

→ BOUT2

BOUT2

8

O

Bridge B output 2

(1)

Directions: I = input, O = output, OZ = tri-state output, OD = open-drain output, IO = input/output

Copyright

© 2009–2011, Texas Instruments Incorporated

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