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

Part Name
Description
Manufacturer
LC78681KE-L Datasheet PDF : 24 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
LC78681KE, 78681KE-L
7. CLV servo circuit; Pin 10: CLV+, pin 11: CLV, pin 12: V/P
MSB
LSB
00000100
00000101
00000110
00000111
Command
DISC MOTOR START (accelerate)
DISC MOTOR CLV (CLV)
DISC MOTOR BRAKE (decelerate)
DISC MOTOR STOP (stop)
RES = low
The CLV+ pin provides the signal that accelerates the disk in the forward direction and the CLVpin provides the
Mode
CLV+
CLV
Accelerate
High
Low
Decelerate
Low
High
CLV
*
*
Stop
Low
Low
signal that decelerates the disk. Commands from the control microprocessor select one of four modes; accelerate,
decelerate, CLV and stop. The table below lists the CLV+ and CLVoutputs in each of these modes.
Note: CLV servo control commands can set the TOFF pin low only in CLV mode. That pin will be at the high level
at all other times.
CLV mode
In CLV mode the LC78681KE detects the disk speed from the HF signal and provides proper linear speed using
Internal mode
CLV+
CLV
V/P
Rough servo (velocity too low)
High
Low
High
Rough servo (velocity too high)
Low
High
High
Phase control (PCK locked)
PWM
PWM
Low
several different control schemes by switching the DSP internal modes. The PWM period is 7.35 kHz. V/P outputs
No. 4969-10/24
 

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