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參數(shù)資料
| 型號(hào)： | LC78625E |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | QFP-80 |
| 文件頁數(shù)： | 6/35頁 |
| 文件大?。?/td> | 535K |
| 代理商： | LC78625E |
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No. 5502-14/35
LC78625E
7. CLV servo circuit; Pin 13: CLV+, pin 14: CLV–, pin 15: V/P
The CLV+ pin provides the signal that accelerates the disk in the forward direction and the CLV– pin provides the
signal that decelerates the disk. Commands from the control microprocessor select one of the four modes accelerate,
decelerate, CLV and stop. The table below lists the CLV+ and CLV– outputs in each of these modes.
Code
COMMAND
RES = L
$04
DISC MOTOR START (accelerate)
$05
DISC MOTOR CLV (CLV)
$06
DISC MOTOR BRAKE (decelerate)
$07
DISC MOTOR STOP (stop)
●
Mode
CLV+
CLV–
Accelerate
H
L
Decelerate
L
H
CLV
Pulse output
Stop
L
Internal Mode
CLV+
CLV–
V/P
Rough servo (When determined to be under speed)
H
L
H
Rough servo (When determined to be over speed)
L
H
Phase control (PCK locked)
PWM
L
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. Control of the TOFF
pin by microprocessor command is only valid in CLV mode.
CLV
mode
In CLV mode the LC78625E detects the disk speed from the HF signal and provides proper linear speed using several
different control schemes by switching the DSP internal modes. The PWM period corresponds to a frequency of 7.35
kHz. The V/P pin outputs a high level during rough servo and a low level during phase control.
Rough servo gain switching
For 8 cm discs, the rough servo mode CLV control gain can be set about 8.5 dB lower than the gain used for 12 cm
discs.
Code
COMMAND
RES = L
$A8
DISC 8 Set
$A9
DISC 12 Set
●
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