ASX340AT Datasheet, PDF (7/75 Pages) ON Semiconductor – Color CMOS NTSC/PAL Digital Image

ASX340CS: 1/4-Inch Color CMOS NTSC/PAL Digital Image Sensor
General Description
General Description
The ON Semiconductor ASX340AT is a VGA-format, single-chip CMOS active-pixel
digital image sensor for automotive applications. It captures high-quality color images
at VGA resolution and outputs NTSC or PAL interlaced composite video.
The VGA CMOS image sensor features ON Semiconductor’s breakthrough low-noise
imaging technology that achieves superior image quality (based on signal-to-noise ratio
and low-light sensitivity) while maintaining the inherent size, cost, low power, and inte-
gration advantages of ON Semiconductor's advanced active pixel CMOS process tech-
nology.
The ASX340AT is a complete camera-on-a-chip. It incorporates sophisticated camera
functions on-chip and is programmable through a simple two-wire serial interface or by
an attached SPI EEPROM or Flash memory that contains setup information that may be
loaded automatically at startup.
The ASX340AT performs sophisticated processing functions including color recovery,
color correction, sharpening, programmable gamma correction, auto black reference
clamping, auto exposure, 50Hz/60Hz flicker detection and avoidance, lens shading
correction, auto white balance (AWB), and on-the-fly defect identification and correc-
tion.
The ASX340AT outputs interlaced-scan images at 60 or 50 fields per second, supporting
both NTSC and PAL video formats. The image data can be output on one or two output
ports:
• Composite analog video (single-ended and differential output support)
• Parallel 8-, 10-bit digital
Architecture
Internal Block Diagram
Figure 1: Internal Block Diagram
SPI
Two-Wire I/F
4
2
SPI & 2W I/F
Interface
2. 8V
Camera Control
AWB
AE
1 .8 V
640 x 480 Active Array
¼” VGA ROI
@ 60 frames per sec.
Image Flow Processor
10
Color & Gamma Correction
Color Space Conversion
Edge Enhancement
Overlay
Graphics
8
Generation
BT -656
VideoEncoder
DAC
NTSC /
PAL
ASX340AT/D Rev. H, 8/15 EN
7
©Semiconductor Components Industries, LLC, 2015.