A4979GLPTR-T datasheet(21/44 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

21

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

FF

Fault register flag

TW1

Temperature diagnostic

TW0

Temperature diagnostic

UV

Undervoltage on VREG or VBB detected

ST

Stall detected

OLB

Open load detected on phase B

OLA

Open load detected on phase A

BML

Overcurrent detected on BM output low side

BMH

Overcurrent detected on BM output high side

BPL

Overcurrent detected on BP output low side

BPH

Overcurrent detected on BP output high side

AML

Overcurrent detected on AM output low side

AMH

Overcurrent detected on AM output high side

APL

Overcurrent detected on AP output low side

APH

Overcurrent detected on AP output high side

15

14

13

12

11

10

9876543210

TBLLD

1

PTP

PT5

PT4

PT3

PT2

PT1

PT0

00000000100000

Fault 0

FF

TW1

TW0

–

UV

ST

OLB

OLA

BML

BMH

BPL

BPH

AML

AMH

APL

APH

Fault 1

FF

TW1

TW0

–

UV

ST

OLB

OLA

0

SA5

SA4

SA3

SA2

SA1

SA0

Table Load Register

Fault Register 0

Fault Register 1

Table Load Register Mapping

Step Angle Number

Phase A

Phase B

0%

0

32

16

48

PT(0)

1

31

33

63

15

17

47

49

PT(1)

2

30

34

62

14

18

46

50

PT(2)

3

29

35

61

13

19

45

51

PT(3)

4

28

36

60

12

20

44

52

PT(4)

5

27

37

59

11

21

43

53

PT(5)

6

26

38

58

10

22

42

54

PT(6)

7

25

39

57

9

23

41

55

PT(7)

8

24

40

56

8

24

40

56

PT(8)

9

23

41

55

7

25

39

57

PT(9)

10

22

42

54

6

26

38

58

PT(10)

11

21

43

53

5

27

37

59

PT(11)

12

20

44

52

4

28

36

60

PT(12)

13

19

45

51

3

29

35

61

PT(13)

14

18

46

50

2

30

34

62

PT(14)

15

17

47

49

1

31

33

63

PT(15)

16

48

0

32

FF

Fault register flag

TW1

Temperature diagnostic

TW0

Temperature diagnostic

UV

Undervoltage on VREG or VBB detected

ST

Stall detected

OLB

Open load detected on phase B

OLA

Open load detected on phase A

SA[0:5]

Step Angle Number read back

OLA

Open load detected on phase A

TW[0:1]

Temperature diagnostic

TW1

TW0

Thermal Indicator

0

No Fault

0

1

Cold Warning

1

0

Hot Warning

1

Overtemperature Shutdown

PTP

Parity bit (odd parity)

PT(0:15)[5:0]

Phase Table Value

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A4979GLPTR-T Datasheet(PDF) 21 Page - Allegro MicroSystems

A4979GLPTR-T Datasheet(HTML) 21 Page - Allegro MicroSystems

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