LC78621E Ver la hoja de datos (PDF) - SANYO -> Panasonic

Número de pieza

componentes Descripción

Fabricante

LC78621E

Compact Disc Player DSP

SANYO -> Panasonic 

LC78621E

Values in parentheses are for the LASER START #2 command. The only difference is in the FST low period.

Note: 1. An FZD falling edge will not be accepted during the period that FST is low.

2. After issuing a focus start command, initialization will be performed if RWC is set high. Therefore, do

not issue the next command during focus start until the focus coil drive S curve has completed.

3. When focus cannot be achieved (i.e., when FZD does not go low) the FOCS signal will remain in the

high state and the lens will remain raised, so the microprocessor should initialize the system by issuing a

NOTHING command.

4. When the RESET pin is set low, the LASER pin is set high directly.

5. Focus start using the DEMO pin executes a mode #1 focus start.

7. CLV servo circuit; Pin 13: CLV+, pin 14: CLV–, pin 15: 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

q

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 four modes; accelerate,

decelerate, CLV and stop. The table below lists the CLV+ and CLV– outputs in each of these modes.

Mode

Accelerate

Decelerate

CLV

Stop

CLV+

High

Low

*

Low

CLV–

Low

High

*

Low

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