HA12188AF データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA12188AF

Pre-amplifier and servo IC for quadruple-speed CD-ROM

Hitachi -> Renesas Electronics 

HA12188AF

Operation

1. Microprocessor Control

The IC’s internal switches can be operated by sending control data from a microprocessor. The signal

timing is shown in figure 1, and the control commands are listed in table 1.

DATA

CLK

XLT

0123456 7

T1

T2

T3

T4

Item

Clock frequency

Clock pulse width

Delay time

Latch pulse width

Symbol

fCLK

T1, T2

T3

T4

Min Typ Max Unit

—

—

520 kHz

0.96 — —

µs

1

——

µs

2

——

µs

Figure 1 Timing Diagram for Microprocessor Control

Signals from the microprocessor are input at pins 23 to 27. A low input at the XRST pin resets the IC.

Normally this pin should be kept high. (See figure 2.)

Logic

Input

I/F

27 CLK

26 DATA

25 XLT

24 DC

23 XRST

Output

I/F

22 SENS

21 COUT

20 DEFECT

or DRT

Figure 2 Microprocessor Interface

Rev.1, Oct. 1995, page 9 of 35

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