A4979GLPTR-T datasheet(4/44 Pages) ALLEGRO

Part #	A4979GLPTR-T

Description	Microstepping Programmable Stepper Motor Driver With Stall Detect and Short Circuit Protection

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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Microstepping Programmable Stepper Motor Driver

With Stall Detect and Short Circuit Protection

A4979

4

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Pin-out Diagram

Terminal List Table

Name

Number

Description

Name

Number

Description

AGND

7

Analog reference ground

REF

8

Reference input voltage

CP1

23

Charge pump capacitor terminal

RESETn

27

Chip reset

CP2

24

Charge pump capacitor terminal

SCK

9

Serial data clock

DIAG

16

Diagnostic output

SDI

6

Serial data input

DIR

3

Direction select input

SDO

17

Serial data output

ENABLE

26

Bridge enable input

SENSA

1

Current sense node – bridge A

MS0

13

Microstep select input

SENSB

14

Current sense node – bridge B

MS1

12

Microstep select input

STEP

19

Step input

OAM

25

Bridge A negative output

STRn

2

Serial data strobe

OAP

4

Bridge A positive output

VBBA

28

Motor supply – bridge A

OBM

18

Bridge B negative output

VBBB

15

Motor supply – bridge B

OBP

11

Bridge B positive output

VCP

22

Above supply voltage

OSC

5

Oscillator input

VDD

10

Logic Supply

PAD

–

Exposed pad for enhanced thermal

dissipation; connect to ground

VREG

20

Regulated voltage

PGND

21

Power ground

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Reg

Ref

VDD

SENSA

STRn

DIR

OAP

AGND

REF

VDD

OBP

SENSB

VBBA

RESETn

ENABLE

OAM

VCP

PGND

VREG

STEP

OBM

DIAG

VBBB

2

P

C

S

O

SDI

SCK

CP1

MS1

MS0

SDO

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A4979GLPTR-T Datasheet(PDF) 4 Page - Allegro MicroSystems

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