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参数资料
| 型号： | LC78625E |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封装： | QFP-80 |
| 文件页数： | 4/35页 |
| 文件大小： | 535K |
| 代理商： | LC78625E |
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Command noise rejection
This command reduces the noise on the CQCK clock signal. While this is effective for noise pulses shorter than 500
ns, the CQCK timings tWL, tWH, and tSU (see page 5, figures 1 and 2), must be set to be at least 1 s.
No. 5502-12/35
LC78625E
Code
COMMAND
RES = L
$EF
Command input noise reduction mode
$EE
Reset the above mode.
●
6. Focus servo circuit; Pin 16: FOCS, pin 17: FST, pin 18: FZD, pin 70: LASER
Code
COMMAND
RES = L
$08
FOCUS START #1
$A2
FOCUS START #2
$0A
LASER ON
$8A
LASER OFF
●
$FE
NOTHING
The FOCS, FST, and FZD pins are not required when the LC78625E is used in combination with an LA9230/40
Series LSI. FZD should be connected to 0 V when these pins are not used. The LA9230/40 Series focus start
command is identical to the LC78625E FOCUS START #1 command.
NOTHING
This command can be used to initialize the LC78625E by inputting FE (hexadecimal: Hexadecimal constants are
written with a dollar sign ($) prefix). Note that $00 is the reset command for the LA9230/40 Series, and should be
used with care since it clears the result of the automatic adjustment process and returns these chips to their initial
states.
Laser control
The LASER pin can be use as an extended output port.
Focus start
When the LC78625E is used in combination with an LA9230/40 Series LSI, the focus start operation is executed
completely on the servo side by commands from the control microprocessor. The following section describes this
operation when the LC78625E is used in combination with an LA9210M or LA9211M.
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.
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