參數(shù)資料
型號(hào)： LC78631E
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP80
封裝： QFP-80
文件頁(yè)數(shù)： 5/34頁(yè)
文件大?。?/td> 502K
代理商： LC78631E
No. 5342-13/34
LC78631E
— Inputting the internal brake on command ($C5) sets the system to internal braking mode. In this mode,
executing a brake command ($06) allows the disc deceleration state to be monitored from the WRQ pin.
— In this mode the system counts the density of the EFM signal during one frame to determine the disk
deceleration state and drops CLV– to low when the EFM signal falls to 4 or lower. At this point, it sets the
WRQ signal high as a braking complete monitor. When the microcontroller detects a high level on the WRQ
signal, it should issue a STOP command to completely stop the disc. In internal braking continuous mode
($CB), the LSI continues the braking operation by holding CLV– high even after the WRQ braking done
monitor signal has been set high.
Note that there are cases where, to compensate for incorrect braking state recognition due to noise in the EFM
signal, the EFM signal count should be changed from 4 to 8 using the internal brake control command ($A3).
— In TON mode during internal braking ($CD), the TOFF signal is set low during internal braking operation. We
recommend using this mode, since it is effective at preventing incorrect detection at the disk mirror surface.
Note: 1. If focus is lost during the execution of an internal braking command, the pickup must be refocussed and
the internal braking command must be input once again.
2. Since incorrect judgments are possible due to the EFM signal reproduction state (due damaged disks,
access in progress, and other problems), we recommend using a microcontroller in conjunction with this
LSI.
6. Track jump
Track jump circuit; Pin 19: HFL, pin 20: TES, pin 23: TOFF, pin 24: TGL, pin 25: THLD, pin 28: JP+, pin 29: JP–
The LC78631E supports the two track count modes listed below.
The old track count function uses the TES signal directly as the internal track counter clock.
To reduce counting errors resulting from noise on the rising and falling edges of the TES signal, the new track
count function prevents noise induced errors by using the combination of the TES and HFL signals, and
implements a more reliable track count function. However, dirt and scratches on the disk can result in HFL signal
dropouts that may result in missing track count pulses. Thus care is required when using this function.
The new track jump mode applies a window to the TES and HFL signals. The LC78631E provides two widths for
this window.
TES WD WIDE.....................The maximum input frequency for TES and HFL is 60 kHz.
Code
Command
RES = low
$22
NEW TRACK COUNT (using the TES/HFL combination)
q
$23
OLD TRACK COUNT (directly counts the TES signal)
Code
Command
RES = low
$BA
TES WD WIDE
q
$BB
TES WD NARW
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