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LC78681KE-L View Datasheet(PDF) - SANYO -> Panasonic

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LC78681KE-L Datasheet PDF : 24 Pages
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LC78681KE, 78681KE-L
6. Focus servo circuit; Pin 13: FOCS, pin 14: FST, pin 15: FZD, pin 57: LASER
MSB
LSB
00001000
10100010
00001010
10001010
00000000
Laser control
Command
FOCUS START #1
FOCUS START #2
LASER ON
LASER OFF
NOTHING
RES = low
Focus start
When a focus start instruction (either FOCUS START #1 or FOCUS START #2) is input as a servo command,
first the charge on capacitor C1 is discharged by FST and the objective lens is lowered. Next, the capacitor is
charged by FOCS, and the lens is slowly raised. FZD falls when the lens reaches the focus point. When this signal
is received, FOCS is reset and the focus servo turns on. After sending the command, the microprocessor should
check the in-focus detection signal (the LA9210 DRF signal) to confirm focus before proceeding to the next part of
the program. If focus is not achieved by the time C1 is fully charged, the microprocessor should issue another
focus command and iterate the focus servo operation.
Note: 1. Values in parentheses are for the FOCUS START #2 command. The only difference is in the FST low period.
2. An FZD falling edge will not be accepted during the period that FST is low.
3. After issuing a focus start command, initialization will be performed if RWC is set high. Therefore, do not issue the next command during
focus start until the focus coil drive S curve has completed.
4. When focus cannot be achieved (i.e., when FZD does not go low) the FOCS signal will remain in the high state, so the microprocessor
should initialize the system by issuing a NOTHING command.
5. When the RESET pin is set low, the LASER pin is set high directly.
6. Focus start using the DEMO coil executes a mode #1 focus start.
No. 4969-9/24
 

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