AMIS-30624 AMI Semiconductor, Inc., AMIS-30624 Datasheet - Page 14
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AMIS-30624
Manufacturer Part Number
AMIS-30624
Description
I2c Microstepping Motordriver
Manufacturer
AMI Semiconductor, Inc.
Datasheet
1.AMIS-30624.pdf
(56 pages)
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AMIS-30624 I
13.4 Acceleration and Deceleration
Sixteen possible values can be programmed for Acc (acceleration and deceleration between V
obtainable values in full-step/s². One observes restrictions for some combination of acceleration index and maximum speed (gray cells).
The accuracy of Acc is derived from the internal oscillator.
Table 9: Acceleration and Deceleration Selection Table
The formula to compute the number of equivalent full-step during acceleration phase is:
13.5 Positioning
The position is programmed in the command
stepping mode, the position words must be aligned as described in Table 10. When using command GotoSecurePosition, data is
automatically aligned.
Table 10: Position Word Alignment
Notes:
Nstep
AMI Semiconductor – Apr. 2007, Rev 3.1, M-20664-003
www.amis.com
(1)
(2)
Stepping Mode
SecurePosition
Half-stepping
=
Hex
LSB: Least significant bit
S: Sign bit
1/16
Vmax
A
B
C
D
E
0
1
2
3
4
5
6
7
8
9
F
1/8
1/4
th
th
th
Vmax (FS/s) →
2
↓ Acc Index
×
2
−
Acc
Vmin
2
S
S
S
S
S
2
C Microstepping Motordriver
Dec
10
11
12
13
14
15
B14
B13
B12
B11
0
1
2
3
4
5
6
7
8
9
B9
B13
B12
B11
B10
B8
B12
B11
B10
B9
B7
99
B11
B10
B9
B8
B6
SetPosition
136
B10
B9
B8
B7
B5
167
Position Word: Pos[15:0]
B9
B8
B7
B6
B4
197
49
29570
and is given as a number of (micro)steps. According to the chosen
14
B8
B7
B6
B5
B3
213
B7
B6
B5
B4
B2
228
B6
B5
B4
B3
B1
Acceleration (Full-step/s²)
243
LSB
B5
B4
B3
B2
273
B4
B3
B2
B1
0
218
1004
3609
6228
8848
11409
13970
16531
34925
40047
19092
21886
24447
27008
29570
303
LSB
B3
B2
B1
0
334
LSB
min
B2
B1
0
0
106
and V
364
LSB
B1
0
0
0
max
395
LSB
0
0
0
0
). Table 9 provides the
456
Data Sheet
1-bit left ⇔ ×2
2-bit left ⇔ ×4
3-bit left ⇔ ×8
546
No shift
No shift
Shift
729
473
735
973
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