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PDF ASX340AT Data sheet ( Hoja de datos )
| Número de pieza | ASX340AT | |
| Descripción | 1/4-Inch Color CMOS NTSC/PAL Digital Image SOC | |
| Fabricantes | ON Semiconductor | |
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ASX340AT
1/4‐inch Color CMOS
NTSC/PAL Digital Image
SOC with Overlay Processor
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 integration
advantages of ON Semiconductor’s advanced active pixel CMOS
process technology.
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
correction.
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
Features
• Low-Power CMOS Image Sensor with Integrated Image Flow
Processor (IFP) and Video Encoder
• 1/4-inch Optical Format, VGA Resolution (640 H x 480 V)
• 2x Upscaling Zoom and Pan Control
• ±40 Additional Columns and ± 36 Additional Rows to Compensate
for Lens Alignment Tolerances
• Option to Use Single 2.8 V Power Supply with Off-Chip Bypass
Transistor
• Overlay Generator for Dynamic Bitmap Overlay
• Integrated Video Encoder for NTSC/PAL with Overlay Capability
and 10-bit I-DAC
• Integrated Microcontroller for Flexibility
• On-Chip Image Flow Processor Performs Sophisticated Processing,
Such as Color Recovery and Correction, Sharpening, Gamma, Lens
Shading Correction, On-the-Fly Defect Correction, Auto White
Balancing, and Auto Exposure
www.onsemi.com
IBGA63 7.5 y 7.5
CASE 503AE
ORDERING INFORMATION
See detailed ordering and shipping information on page 3 of
this data sheet.
• Auto Black-Level Calibration
• 10-Bit, On-Chip Analog-to-Digital
Converter (ADC)
• Internal Master Clock Generated by
On-Chip Phase-Locked Loop (PLL)
• Two-Wire Serial Programming Interface
• Interface to Low-Cost EEPROM and Flash
through SPI Bus
• High-Level Host Command Interface
• Stand-Alone Operation Support
• Comprehensive Tool Support for Overlay
Generation and Lens Correction Setup
• Development System with DevWare
Applications
• Automotive Rear View Camera and Side
Mirror
• Blind Spot and Surround View
© Semiconductor Components Industries, LLC, 2014
October, 2016 − Rev. 10
1
Publication Order Number:
ASX340AT/D
1 page  
Internal Block Diagram
SPI Two−Wire I/F
42
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
Graphics
8 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
www.onsemi.com
5
5 Page 
ASX340AT
SCENE
(Front view)
OPTICS
Process of Image Gathering and Image Display
IMAGE SENSOR
(Rear view)
Start Rasterization
IMAGE CAPTURE
Row by Row
Start Readout
IMAGE RENDERING
DISPLAY
(Front view)
Figure 6. Image Capture Example
SENSOR PIXEL ARRAY
The active pixel array is 640 x 480 pixels. In addition,
there are 72 rows and 80 columns for lens alignment and 8
rows and 8 columns for demosaic.
Column Readout Direction
... Black Pixels
GGGG
First Lens Alignment
Pixel
(64, 0)
Direction ... R R R
GGG
BBBB
Figure 7. Pixel Color Pattern Detail (top right corner)
www.onsemi.com
11
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| PDF Descargar | [ Datasheet ASX340AT.PDF ] | |
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