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LC78681E bảng dữ liệu(PDF) 10 Page - Sanyo Semicon Device

tên linh kiện LC78681E
Giải thích chi tiết về linh kiện  Digital Signal Processor for Compact Disc Players
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LC78681E bảng dữ liệu(HTML) 10 Page - Sanyo Semicon Device

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Note: If for Focus Start 2, the value in parentheses is in effect only when FST is low (unlike Focus Start 1).
Notes: 1. The falling edge of FZD is not accepted when FST is low.
2. After a Focus Start command has been issued, the focus servocontroller is reinitialized when RWC goes high.
For this reason, a new command should not be issued until the S-curve for the focus coil drive has been
completed.
3. If focus cannot be reached (i.e., the FZD signal does not go low), the FOCS signal remains high and the lens
remains raised. In this case, the Nothing command should be issued to reinitialize the servocontroller.
4. When the RES pin is set low, LASER is directly set high.
5. Focus start using the DEMO pin is in mode 1.
Constant Linear Velocity Servocontroller (pin 10: CLV +, pin 11: CLV and pin 12: V/P)
The disc motor accelerates when CLV+ is high and decelerates when CLVis high. These outputs are selected by the
motor mode commands issued by the microprocessor (accelerate, decelerate, CLV, or stop). The CLV+ and CLV
outputs for each mode are shown in the following table.
No. 4521-10/23
LC78681E
MSB
LSB
Command
RES = low
00000100
DISC MOTOR START (accelerate)
00000101
DISC MOTOR CLV (CLV)
00000110
DISC MOTOR BRAKE (decelerate)
00000111
DISC MOTOR STOP (stop)
Mode
CLV+
CLV
Accelerate
High
Low
Decelerate
Low
High
CLV
**
Stop
Low
Low


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