ASX340AT datasheet(7/75 Pages) ONSEMI

7 / 75 page

ASX340AT/D Rev. H, 8/15 EN

©Semiconductor Components Industries, LLC, 2015.

ASX340CS: 1/4-Inch Color CMOS NTSC/PAL Digital Image Sensor

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

Image Flow Processor

Color & Gamma Correction

Color Space Conversion

Edge Enhancement

Camera Control

AWB

¼” VGA ROI

@ 60 frames per sec.

640 x 480 Active Array

SPI & 2W I/F

Interface

SPI

2. 8V

1.8V

Two-Wire I/F

Overlay

Graphics

Generation

VideoEncoder

DAC

NTSC /

PAL

BT -656

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