AMIS-30622_13 Datasheet, PDF (11/50 Pages) ON Semiconductor – I2C Micro-Stepping Motor Driver

AMIS−30622
POSITIONING PARAMETERS
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
Maximum Velocity
For each stepping mode, the maximum velocity 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.
Table 7. MAXIMUM VELOCITY SELECTION TABLE
Vmax Index
Vmax
Hex Dec (full step/s) Group
0
0
99
A
1
1
136
2
2
167
3
3
197
B
4
4
213
5
5
228
6
6
243
7
7
273
8
8
303
9
9
334
C
A
10
364
B
11
395
C
12
456
D
13
546
E
14
729
D
F
15
973
Half−stepping
(half−step/s)
197
273
334
395
425
456
486
546
607
668
729
790
912
1091
1457
1945
Stepping Mode
1/4^th
Micro−stepping
(micro−step/s)
1/8^th
Micro−stepping
(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
1/16^th
Micro−stepping
(micro−step/s)
1579
2182
2670
3159
3403
3647
3891
4364
4852
5341
5829
6317
7294
8728
11658
15564
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