A3957SLB View Datasheet(PDF) - Allegro MicroSystems
Part Name
Description
MFG CO.
'A3957SLB' PDF : 16 Pages View PDF
3957
FULL-BRIDGE PWM
MICROSTEPPING
MOTOR DRIVER
Table 4 — Step Sequencing
Full 1/2 1/4 1/8 1/16
Step Step Step Step Step
11111
2
23
4
235
6
47
8
2359
10
6 11
12
4 7 13
14
8 15
16
2 3 5 9 17
18
10 19
20
6 11 21
22
12 23
24
4 7 13 25
26
14 27
28
8 15 29
30
16 31
32
3 5 9 17 33
34
18 35
36
10 19 37
38
20 39
40
6 11 21 41
42
22 43
44
12 23 45
46
24 47
48
4 7 13 25 49
50
26 51
52
14 27 53
54
28 55
56
8 15 29 57
58
30 59
60
16 31 61
62
32 63
64
PHASEA D3A
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
L
H
L
H
L
H
L
H
L
X
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
L
L
L
L
L
L
L
L
L
L
L
X
L
H
L
H
L
H
L
H
L
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
Bridge A
D2A D1A
H
H
H
H
H
H
H
H
H
L
H
L
L
H
L
H
L
L
L
L
H
H
H
H
H
L
H
L
L
H
L
H
L
L
L
H
L
H
H
L
H
L
H
H
H
H
L
L
L
L
L
H
L
H
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
L
L
H
L
H
L
L
L
L
H
H
H
H
H
L
H
L
L
H
L
H
L
L
L
H
L
H
H
L
H
L
H
H
H
H
L
L
L
L
L
H
L
H
H
L
H
L
H
H
H
H
H
H
Bridge B
D0A ILOAD A PHASEB D3B D2B D1B D0B ILOAD B
H 100%
X
L
L
L
X
0%
H 100%
H
L
L
H
L 17.4%
H 100%
H
L
L
H H 26.1%
L 95.7%
H
L
H
L
L 34.8%
H 91.3%
H
L
H
L H 43.5%
L 87.0%
H
L
H
H
L 52.2%
H 82.6%
H
L
H
H
H 60.9%
L 78.3%
H
H
L
L
L 69.6%
H 73.9%
H
H
L
L H 73.9%
L 69.6%
H
H
L
H
L 78.3%
H 60.9%
H
H
L
H H 82.6%
L 52.2%
H
H
H
L
L 87.0%
H 43.5%
H
H
H
L H 91.3%
L 34.8%
H
H
H
H
L 95.7%
H 26.1%
H
H
H
H
H 100%
L 17.4%
H
H
H
H
H 100%
X
0%
H
H
H
H
H 100%
L -17.4%
H
H
H
H
H 100%
H -26.1%
H
H
H
H
H 100%
L -34.8%
H
H
H
H
L 95.7%
H -43.5%
H
H
H
L H 91.3%
L -52.2%
H
H
H
L
L 87.0%
H -60.9%
H
H
L
H H 82.6%
L -69.6%
H
H
L
H
L 78.3%
H -73.9%
H
H
L
L H 73.9%
L -78.3%
H
H
L
L
L 69.6%
H -82.6%
H
L
H
H
H 60.9%
L -87.0%
H
L
H
H
L 52.2%
H -91.3%
H
L
H
L H 43.5%
L -95.7%
H
L
H
L
L 34.8%
H -100%
H
L
L
H H 26.1%
H -100%
H
L
L
H
L 17.4%
H -100%
X
L
L
L
X
0%
H -100%
L
L
L
H
L -17.4%
H -100%
L
L
L
H H -26.1%
L -95.7%
L
L
H
L
L -34.8%
H -91.3%
L
L
H
L H -43.5%
L -87.0%
L
L
H
H
L -52.2%
H -82.6%
L
L
H
H
H -60.9%
L -78.3%
L
H
L
L
L -69.6%
H -73.9%
L
H
L
L H -73.9%
L -69.6%
L
H
L
H
L -78.3%
H -60.9%
L
H
L
H H -82.6%
L -52.2%
L
H
H
L
L -87.0%
H -43.5%
L
H
H
L H -91.3%
L -34.8%
L
H
H
H
L -95.7%
H -26.1%
L
H
H
H
H -100%
L -17.4%
L
H
H
H
H -100%
X
0%
L
H
H
H
H -100%
L 17.4%
L
H
H
H
H -100%
H 26.1%
L
H
H
H
H -100%
L 34.8%
L
H
H
H
L -95.7%
H 43.5%
L
H
H
L H -91.3%
L 52.2%
L
H
H
L
L -87.0%
H 60.9%
L
H
L
H H -82.6%
L 69.6%
L
H
L
H
L -78.3%
H 73.9%
L
H
L
L H -73.9%
L 78.3%
L
H
L
L
L -69.6%
H 82.6%
L
L
H
H
H -60.9%
L 87.0%
L
L
H
H
L -52.2%
H 91.3%
L
L
H
L H -43.5%
L 95.7%
L
L
H
L
L -34.8%
H 100%
L
L
L
H H -26.1%
H 100%
L
L
L
H
L -17.4%
Step
angle
0°
45°
90°
135°
180°
225°
270°
315°
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