ASX340CS datasheet(24/74 Pages) ONSEMI

24 / 74 page

ASX340CS_DS Rev. F Pub. 6/15 EN

©Semiconductor Components Industries, LLC, 2015.

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

System Configuration and Usage Modes

Output Formats

ITU-R BT.656 and RGB Output

TheASX340CS can output processed video as a standard ITU-R BT.656 (CCIR656)

stream, an RGB stream, or as unprocessed Bayer data. The ITU-R BT.656 stream contains

YCbCr 4:2:2 data with embedded synchronization codes. This output is typically suitable

for subsequent display by standard video equipment or JPEG/MPEG compression.

Colorpipe data (pre-lens correction and overlay) can also be output in YCbCr 4:2:2 and a

variety of RGB formats in 640 by 480 progressive format in conjunction with

LINE_VALID and FRAME_VALID.

The ASX340CS can be configured to output 16-bit RGB (565RGB), 15-bit RGB (555RGB),

and two types of 12-bit RGB (444RGB). Refer to Table 24 and Table 25 on page 45 for

details.

Bayer Output

Unprocessed Bayer data are generated when bypassing the IFP completely—that is, by

simply outputting the sensor Bayer stream as usual, using FRAME_VALID, LINE_VALID,

and PIXCLK to time the data. This mode is called sensor bypass mode.

Output Ports

Composite Video Output

The composite video output DAC is external-resistor-programmable and supports both

single-ended and differential output. The DAC is driven by the on-chip video encoder

output.

Parallel Output

Parallel output uses either 8-bit or 10-bit output. Eight-bit output is used for ITU-R

BT.656 and RGB output. Ten-bit output is used for raw Bayer output.

Zoom Support

The ASX340CS supports zoom x1 and x2 modes, in interlaced and progressive scan

modes. The progressive support is limited to the VGA at either 60 fps or 50 fps.

In the zoom x2 modes, the sensor is configured for QVGA (320 x 240), and the zoom x2

window can be configured to pan around the VGA window.

FOV Stretch Support

The ASX340CS supports the ability to control the active 'width' of the TV output line,

between 692 and 720 pixels. The hardware supports two margins, each a maximum of 14

pixels width, and has to be an even number of pixels.

System Configuration and Usage Modes

How a camera based on the ASX340CS will be configured depends on what features are

used. There are essentially three configuration modes for ASX340CS: Auto-Config Mode,

Flash-Config Mode, and Host-Config Mode. Refer to System Configuration and Usage

Modes in the Developer Guide document for details.

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