AMIS-30623 AMI Semiconductor, Inc., AMIS-30623 Datasheet - Page 14

• Manufacturer Part Number: AMIS-30623
• Description: Lin Microstepping Motordriver
• Manufacturer: AMI Semiconductor, Inc.

AMIS-30623 LIN Microstepping Motordriver
13.4 Acceleration and Deceleration
Sixteen possible values can be programmed for Acc (acceleration and deceleration between Vmin and Vmax).
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 10: Acceleration and Deceleration Selection Table
The formula to compute the number of equivalent full-step during acceleration phase is:
13.5 Positioning
The position programmed in commands
the chosen stepping mode, the position words must be aligned as described in Table 11. When using command
or GotoSecurePosition, data is automatically aligned.
Table 11: Position Word Alignment
Notes
(1) LSB: Least Significant Bit
(2) S: Sign bit
Nstep
AMI Semiconductor – June 2006, Rev 3.0
Stepping mode
www.amis.com
SecurePosition
PositionShort
Half-stepping
Hex
=
1/16
A
B
C
D
E
1/8
1/4
0
1
2
3
4
5
6
7
8
9
F
Vmax
th
th
th
↓ Acc index
2
×
2
Acc
−
Vmin
S
S
S
S
S
S
Vmax (FS/s) → 99
2
Dec
10
11
12
13
14
15
B14 B13 B12 B11 B10 B9
B13 B12 B11 B10 B9
B12 B11 B10 B9
B11 B10 B9
0
1
2
3
4
5
6
7
8
9
B9
S
B8
S
B9
B7
SetPosition
B8
B8
B6
136 167 197 213 228 243 273 303 334 364 395 456 546 729 973
B8
B7
B7
B5
Position word: Pos[15:0]
B8
B7
B6
B6
B4
and
49
29570
SetPositionShort
B8
B7
B6
B5
B5
B3
14
B7
B6
B5
B4
B4
B2
Acceleration (Full-step/s²)
B6
B5
B4
B3
B3
B1 LSB
B5
B4
B3
B2
B2
is given as a number of (micro)steps. According to
34925
40047
11409
13970
16531
19092
21886
24447
27008
29570
1004
3609
6228
8848
B4
B3
B2
B1 LSB
B1 LSB
218
0
B3
B2
B1 LSB
0
B2
B1 LSB
0
0
0
106
B1 LSB
0
0
0
0
0
0
0
0
0
Table 10
SetPositionShort
1-bit left ⇔ ×2
2-bit left ⇔ ×4
3-bit left ⇔ ×8
Data Sheet
No shift
No shift
No shift
Shift
provides the
473
735