AMIS-30621 Datasheet, PDF (11/59 Pages) AMI SEMICONDUCTOR – LIN Microstepping Motordriver

AMIS−30621
Minimum Velocity
Once the maximum velocity is chosen, 16 possible values can be programmed for the minimum velocity Vmin. The table
below provides the obtainable values in full−step/s. The accuracy of Vmin is derived from the internal oscillator.
Table 8. OBTAINABLE VALUES IN FULL−STEP/S FOR THE MINIMUM VELOCITY
Vmax (Full−step/s)
V_min Index
Hex Dec Vmax Factor
A
B
C
D
99 136 167 197 213 228 243 273 303 334 364 395 456 546 729 973
00
1
99 136 167 197 213 228 243 273 303 334 364 395 456 546 729 973
11
1/32
3 4 5 6 6 7 7 8 8 10 10 11 13 15 19 27
22
2/32
6 8 10 11 12 13 14 15 17 19 21 23 27 31 42 57
33
3/32
9 12 15 18 19 21 22 25 27 31 32 36 42 50 65 88
44
4/32
12 16 20 24 26 28 30 32 36 40 44 48 55 65 88 118
55
5/32
15 21 26 31 32 35 37 42 46 51 55 61 71 84 111 149
66
6/32
18 25 31 36 39 42 45 50 55 61 67 72 84 99 134 179
77
7/32
21 30 36 43 46 50 52 59 65 72 78 86 99 118 156 210
88
8/32
24 33 41 49 52 56 60 67 74 82 90 97 113 134 179 240
99
9/32
28 38 47 55 59 64 68 76 84 93 101 111 128 153 202 271
A 10
10/32
31 42 51 61 66 71 75 84 93 103 113 122 141 168 225 301
B 11
11/32
34 47 57 68 72 78 83 93 103 114 124 135 156 187 248 332
C 12
12/32
37 51 62 73 79 85 91 101 113 124 135 147 170 202 271 362
D 13
13/32
40 55 68 80 86 93 98 111 122 135 147 160 185 221 294 393
E 14
14/32
43 59 72 86 93 99 106 118 132 145 158 172 198 237 317 423
F 15
15/32
46 64 78 93 99 107 113 128 141 156 170 185 214 256 340 454
NOTES: The Vmax factor is an approximation.
In case of motion without acceleration (AccShape = 1) the length of the steps = 1/Vmin. In case of accelerated motion
(AccShape = 0) the length of the first step is shorter than 1/Vmin depending of Vmin, Vmax and Acc.
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