A3981 Allegro Micro Systems, Inc., A3981 Datasheet - Page 19

• Manufacturer Part Number: A3981
• Manufacturer: Allegro Micro Systems, Inc.

A3981
Table Load Register
PTP
PT(0..15)[5..0]
Table Load Register Mapping
0%
PT(0)
PT(1)
PT(2)
PT(3)
PT(4)
PT(5)
PT(6)
PT(7)
PT(8)
PT(9)
PT(10)
PT(11)
PT(12)
PT(13)
PT(14)
PT(15)
TBLLD
Fault 0
Fault 1
Parity bit (odd parity)
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
Phase Table Value
Phase A
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Step Angle Number
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
FF
FF
15
1
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
TW1
TW1
14
15
14
13
12
11
10
1
9
8
7
6
5
4
3
2
1
0
Phase B
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
TW0
TW0
13
0
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
OV
OV
12
0
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
Automotive, Programmable Stepper Driver
UV
UV
11
0
10
ST
ST
0
OLB
OLB
9
0
Fault Register 0
FF
TW1
TW0
OV
UV
ST
OLB
OLA
BML
BMH
BPL
BPH
AML
AMH
APL
APH
Fault Register 1
FF
TW1
TW0
OV
UV
ST
OLB
OLA
SA[0..5]
OLA
TW[0..1]
OLA
OLA
8
0
BML
7
0
0
Fault register flag
Temperature diagnostic
Temperature diagnostic
Overvoltage on VBB detected
Undervoltage on VREG or VBB detected
Stall detected
Open load detected on phase B
Open load detected on phase A
Overcurrent detected on BM output low side
Overcurrent detected on BM output high side
Overcurrent detected on BP output low side
Overcurrent detected on BP output high side
Overcurrent detected on AM output low side
Overcurrent detected on AM output high side
Overcurrent detected on AP output low side
Overcurrent detected on AP output high side
Fault register flag
Temperature diagnostic
Temperature diagnostic
Overvoltage on VBB detected
Undervoltage on VREG or VBB detected
Stall detected
Open load detected on phase B
Open load detected on phase A
Step Angle Number read back
Open load detected on phase A
Temperature diagnostic
TW1
0
0
1
1
BMH
PTP
6
0
0
TW0
PT5
BPL
SA5
0
1
0
1
5
1
BPH
SA4
PT4
Thermal Indicator
4
0
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
No Fault
Cold Warning
Hot Warning
Overtemperature Shutdown
AML
SA3
PT3
3
0
AMH
PT2
SA2
2
0
PT1
APL
SA1
1
0
APH
PT0
SA0
0
0
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