A4979 查看數據表（PDF） - Allegro MicroSystems

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A4979

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

Allegro MicroSystems 

A4979

Microstepping Programmable Stepper Motor Driver

With Stall Detect and Short Circuit Protection

Pin-out Diagram

SENSA 1

STRn 2

DIR 3

OAP 4

OSC 5

SDI 6

AGND 7

REF 8 Ref

SCK 9

VDD 10 VDD

OBP 11

MS1 12

MS0 13

SENSB 14

28 VBBA

27 RESETn

26 ENABLE

25 OAM

24 CP2

23 CP1

22 VCP

21 PGND

Reg 20 VREG

19 STEP

18 OBM

17 SDO

16 DIAG

15 VBBB

Terminal List Table

Name Number

Description

AGND

7

Analog reference ground

CP1

23

Charge pump capacitor terminal

CP2

24

Charge pump capacitor terminal

DIAG

16

Diagnostic output

DIR

3

Direction select input

ENABLE

26

Bridge enable input

MS0

13

Microstep select input

MS1

12

Microstep select input

OAM

25

Bridge A negative output

OAP

4

Bridge A positive output

OBM

18

Bridge B negative output

OBP

11

Bridge B positive output

OSC

5

Oscillator input

PAD

–

Exposed pad for enhanced thermal

dissipation; connect to ground

PGND

21

Power ground

Name

REF

RESETn

SCK

SDI

SDO

SENSA

SENSB

STEP

STRn

VBBA

VBBB

VCP

VDD

Number

Description

8

Reference input voltage

27

Chip reset

9

Serial data clock

6

Serial data input

17

Serial data output

1

Current sense node – bridge A

14

Current sense node – bridge B

19

Step input

2

Serial data strobe

28

Motor supply – bridge A

15

Motor supply – bridge B

22

Above supply voltage

10

Logic Supply

VREG

20

Regulated voltage

Allegro MicroSystems, LLC

4

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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