ASX340AT datasheet(5/54 Pages) ONSEMI

5 / 54 page

ASX340AT

www.onsemi.com

Internal Block Diagram

Overlay

Graphics

Generation

640 x 480 Active Array

SPI

2 . 8 V

1 . 8 V

Two−Wire I/F

NTSC/

PAL

BT−656

VideoEncoder

DAC

Image Flow Processor

Color & Gama Correction

Color Space Conversion

Edge enhancement

Camera control

AWB

¼’’VGA ROI

@ 60 frames per sec.

SPI & 2WI/F

Interface

Figure 2. Internal Block Diagram

Overlay

Graphics

Generation

Crystal Usage

As an alternative to using an external oscillator, a

fundamental 27 MHz crystal may be connected between

EXTCLK and XTAL. Two small loading capacitors of

10–22 pF of NPO dielectric should be added as shown in

Figure 3.

ON Semiconductor does not recommend using the crystal

option for applications above 85°C. A crystal oscillator with

temperature compensation is recommended.

Figure 3. Using a Crystal Instead of an External Oscillator

EXTCLK

XTAL

18 pF −NPO

27.000 MHz

Sensor

18pF −NPO

NOTE: Value of load capacitor is crystal dependent. Crystal with small load capacitor is recommended.

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