ASX340AT_16 Datasheet, PDF (5/54 Pages) ON Semiconductor – 1/4‐inch Color CMOS NTSC/PAL Digital Image SOC

Internal Block Diagram
SPI Two−Wire I/F
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2
SPI & 2WI/F
Interface
ASX340AT
2.8V
1.8V
Camera control
AWB
AE
640 x 480 Active Array
¼’’VGA ROI
@ 60 frames per sec.
Image Flow Processor
10
Color & Gama Correction
Color Space Conversion
Edge enhancement
Figure 2. Internal Block Diagram
Overlay ₈
Graphics
BT−656
Generation
VideoEncoder
DAC
NTSC/
PAL
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.
18 pF −NPO
27.000 MHz
18pF −NPO
ON Semiconductor does not recommend using the crystal
option for applications above 85°C. A crystal oscillator with
temperature compensation is recommended.
Sensor
EXTCLK
XTAL
NOTE: Value of load capacitor is crystal dependent. Crystal with small load capacitor is recommended.
Figure 3. Using a Crystal Instead of an External Oscillator
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