AMIS-30622 Datasheet, PDF (11/42 Pages) AMI SEMICONDUCTOR – I2C Microstepping Motordriver

AMIS-30622
8. Positioning data
8.1. Stepping modes
One of 4 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)
Group
99
A
136
167
197
213
B
228
243
273
303
334
364
C
395
456
546
729
D
973
Stepping mode
Half-stepping
(half-step/s)
1/4^th
1/8^th
micro-stepping micro-stepping
(micro-step/s) (micro-step/s)
1/16^th
micro-stepping
(micro-step/s)
197
395
790
1579
273
546
1091
2182
334
668
1335
2670
395
790
1579
3159
425
851
1701
3403
456
912
1823
3647
486
973
1945
3891
546
1091
2182
4364
607
1213
2426
4852
668
1335
2670
5341
729
1457
2914
5829
790
1579
3159
6317
912
1823
3647
7294
1091
2182
4364
8728
1457
2914
5829
11658
1945
3891
7782
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.
Vmin 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
Vmax (Full-step/s)
136 167 197 213 228 243 273 303 334 364 395 456 546 729 973
136 167 197 213 228 243 273 303 334 364 395 456 546 729 973
4 5 6 6 7 7 8 8 10 10 11 13 15 19 27
8 10 11 12 13 14 15 17 19 21 23 27 31 42 57
12 15 18 19 21 22 25 27 31 32 36 42 50 65 88
16 20 24 26 28 30 32 36 40 44 48 55 65 88 118
21 26 31 32 35 37 42 46 51 55 61 71 84 111 149
25 31 36 39 42 45 50 55 61 67 72 84 99 134 179
30 36 43 46 50 52 59 65 72 78 86 99 118 156 210
33 41 49 52 56 60 67 74 82 90 97 113 134 179 240
38 47 55 59 64 68 76 84 93 101 111 128 153 202 271
42 51 61 66 71 75 84 93 103 113 122 141 168 225 301
47 57 68 72 78 83 93 103 114 124 135 156 187 248 332
51 62 73 79 85 91 101 113 124 135 147 170 202 271 362
55 68 80 86 93 98 111 122 135 147 160 185 221 294 393
59 72 86 93 99 106 118 132 145 158 172 198 237 317 423
64 78 93 99 107 113 128 141 156 170 185 214 256 340 454
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