AMIS-30621 Datasheet, PDF (8/43 Pages) AMI SEMICONDUCTOR – LIN Microstepping Motordriver

AMIS-30621 LIN Microstepping Motordriver
Data Sheet
8.0 Positioning Data
8.1 Stepping Modes
One of four possible stepping modes can be programmed:
• Half-stepping
• 1/4 micro-stepping
• 1/8 micro-stepping
• 1/16 micro-stepping
8.2 Maximum Velocity
For each stepping mode, Vmax can be programmed to 16
possible values given in the table below.
The accuracy of Vmax is derived from the internal oscillator.
Under special circumstances it is possible to change the
Vmax parameter while a motion is ongoing. All 16 entries
for the Vmax parameter are divided into four groups. When
changing Vmax during a motion the application must take
care that the new Vmax parameter stays within the same
group.
Vmax
Index
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Vmax
(Full Step/s)
99
136
167
197
213
228
243
273
303
334
364
395
456
546
729
973
Group
A
B
C
D
Half-stepping
(half-step/s)
197
273
334
395
425
456
486
546
607
668
729
790
912
1091
1457
1945
Stepping Mode
1/4th Micro-stepping
1/8th Micro-stepping
(micro-step/s)
(micro-step/s)
395
790
546
1091
668
1335
790
1579
851
1701
912
1823
973
1945
1091
2182
1213
2426
1335
2670
1457
2914
1579
3159
1823
3647
2182
4364
2914
5829
3891
7782
1/16th Micro-stepping
(micro-step/s)
1579
2182
2670
3159
3403
3647
3891
4364
4852
5341
5829
6317
7294
8728
11658
15564
8.3 Minimum Velocity
Once Vmax is chosen, 16 possible values can be
programmed for Vmin. The table below provides the
obtainable values in Full-step/s. The accuracy of Vmin is
derived from the internal oscillator.
Vmax Vmax
Index Factor 99
0
1
99
1
1/32 3
2
2/32 6
3
3/32 9
4
4/32 12
5
5/32 15
6
6/32 18
7
7/32 21
8
8/32 24
9
9/32 28
10 10/32 31
11 11/32 34
12 12/32 37
13 13/32 40
14 14/32 43
15 15/32 46
136 167 197 213
136 167 197 213
4
5
6
6
8
10 11 12
12 15 18 19
16 20 24 26
21 26 31 32
25 31 36 39
30 36 43 46
33 41 49 52
38 47 55 59
42 51 61 66
47 57 68 72
51 62 73 79
55 68 80 86
59 72 86 93
64 78 93 99
228 243
228 243
7
7
13 14
21 22
28 30
35 37
42 45
50 52
56 60
64 68
71 75
78 83
85 91
93 98
99 106
107 113
Notes
(1) The Vmax factor is an approximation.
(2) In case of motion without acceleration (AccShape = 1)
the length of the steps = 1/Vmin. In case of accelerated
Vimax (Full-step/s)
273 303 334 364 395 456 546 729 973
273 303 334 364 395 456 546 729 973
8
8
10
10
11 13 15 19 27
15
17
19
21
23 27 31 42 57
25
27
31
32
36 42 50 65 88
32
36
40
44
48 55 65 88 118
42
46
51
55
61 71 84 111 149
50
55
61
67
72 84 99 134 179
59
65
72
78
86 99 118 156 210
67
74
82
90
97 113 134 179 240
76
84
93 101 111 128 153 202 271
84
93
103 113 122 141 168 225 301
93 103 114 124 135 156 187 248 332
101 113 124 135 147 170 202 271 362
111 122 135 147 160 185 221 294 393
118 132 145 158 172 198 237 317 423
128 141 156 170 185 214 256 340 454
motion (AccShape = 0) the length of the first step is shorter
than 1/Vmin depending of Vmin, Vmax and Acc.
AMI Semiconductor - Rev. 1.4
www.amis.com
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