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參數資料
| 型號： | LC78625E |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | QFP-80 |
| 文件頁數： | 10/35頁 |
| 文件大小： | 535K |
| 代理商： | LC78625E |
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No. 5502-18/35
LC78625E
Track jump modes
The table lists the relationships between acceleration pulses, deceleration pulses, and the braking period.
Note:* Applications can select whether or not a braking period (period C) is present. Code $F6 selects operation without a braking period, and code $7F
selects operation with a 60-ms braking period. The LC78625E defaults to no braking period operation after a reset.
* As indicated in the table, actuator signals are not output during the 256 TRACK CHECK function. This is a mode in which the TES signal is counted in
the tracking loop off state. Therefore, feed motor forwarding is required.
* The servo command register is automatically reset after one cycle of the track jump sequence (a, b, c) completes.
* If another track jump command is issued during a track jump operation, the contents of that new command will be executed immediately.
* The 1 TRACK JUMP #3 and 2 TRACK JUMP modes (the earlier modes) do not have a braking period (the C period). Since brake mode must be
generated by an external circuit, care is required when using this mode.
Item
Previous Track Jump Mode
New Track Jump Mode
a
bca
bc
1 TRACK JUMP IN (OUT) #1
233 s
60 ms
233 s
60 ms
1 TRACK JUMP IN (OUT) #2
0.5 track jump
233 s
60 ms
0.5 track jump
60 ms
period
1 TRACK JUMP IN (OUT) #3
0.5 track jump
233 s
This period does
0.5 track jump
This period does
period
not exist.
period
not exist.
1 TRACK JUMP IN (OUT) #4
0.5 track jump
233 s
60 ms; TOFF is low
0.5 track jump
60 ms; TOFF is low
period
during the C period.
period
during the C period.
2 TRACK JUMP IN (OUT)
None
1 track jump
See note.
period
4 TRACK JUMP IN (OUT)
2 track jump
466 s
60 ms
2 track jump
60 ms
period
16 TRACK JUMP IN (OUT)
9 track jump
7 track jump
60 ms
9 track jump
60 ms
period
32 TRACK JUMP IN (OUT)
18 track jump
14 track jump
60 ms
18 track jump
14 track jump
60 ms
period
64 TRACK JUMP IN (OUT)
36 track jump
28 track jump
60 ms
36 track jump
28 track jump
60 ms
period
128 TRACK JUMP IN (OUT)
72 track jump
56 track jump
60 ms
72 track jump
56 track jump
60 ms
period
TOFF goes high during the period
256 TRACK CHECK
when 256 tracks are passed over.
60 ms
when 256 tracks are passed over.
60 ms
The a and b pulses are not output.
TRACK JUMP BRAKE
There are no a and b periods.
60 ms
There are no a and b periods.
60 ms
When the LC78625E is used in combination with an LA9230/40 Series LSI, since the THLD signal is generated by the
LA9230/40, the THLD pin (pin 25) will be unused, and should be left open.
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