LR38666Y Ver la hoja de datos (PDF) - Sharp Electronics

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LR38666Y

One-chip System LSI for Digital Still Cameras

Sharp Electronics 

FUNCTIONAL DESCRIPTION

Oscillation Circuit

The PLL included in the LR38666Y divides or

LR38666Y

passes through the doubled frequency of the quartz

crystal connected to I/O pins, and provides it to the

internal logic circuits as shown in Fig.1 and Fig.2.

C24MI (or C29MI or COMI)

Oscillation Circuit

(PLL)

Frequency

Divider

C24MO

(or C29MO or COMO)

Fig. 1 Block Diagram of Oscillation Circuit

To Internal Logic

C1

C24MI

(or C29MI or COMI)

RD2

C2

RD1

C24MO

(or C29MO or COMO)

Fig. 2 Clock Input to Oscillation Circuit

Connection of Quartz Crystal (TA = 0 to +70˚C) : Example of Oscillation under Fundamental Frequencies

APPLICABLE PINS

C24MI, C24MO

C29MI, C29MO

COMI, COMO

FUNDAMENTAL

FREQUENCY [MHz]

24.5454

29.5000

24.0000

C1 [pF]

10

10

10

RECOMMENDED COEFFICIENT

C2 [pF]

RD1 [$]

10

220

10

220

10

220

RD2 [$]

1M

1M

1M

NOTES :

1. The oscillation circuit should be located as close to C24MI, C24MO (C29MI, C29MO, COMI, COMO) as possible.

2. Do not install other signal lines in the shaded area.

3. Perform due evaluation on the match between the LR38666Y and the quartz crystal.

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