OV6120 datasheet(7/31 Pages) ETC

7 / 31 page

14 May 1999

Version 1.11

OV6620/OV6120

SINGLE IC CMOS COLOR AND B/W DIGITAL CAMERAS

OMNIVISION TECHNOLOGIES, Inc.

Advanced Information

Preliminary

1.2.5

QCIF Format

A QCIF mode is available for applications where high

resolution image capture is not required. When pro-

grammed in this mode, the pixel rate is reduced by one-

half. Default resolution is 176 x 144 pixels and can be

user-programmed for other resolutions. Refer to Table

7. QCIF Digital Output Format (YUV, beginning of line)

and Table 8. QCIF Digital Output Format (RGB Raw Da-

ta, Beginning of Line) for further information.

1.2.6

Video Output

The video output port of the OV6620/OV6120 image

sensors provides a number of output format/standard

options to suit many different application requirements.

Table 2. Digital Output Formats, below, indicates the

output formats available. These formats are user pro-

grammable through the I2C interface (See Section 3.1

I2C Bus Protocol Format).

The OV6620/OV6120 imager supports both CCIR601

and CCIR656 output formats in the following configura-

tions (See Table 3. 4:2:2 16-bit Format for further de-

tails):

– 16-bit, 4:2:2 format

(This mode complies with the 60/50 Hz CCIR601 tim-

ing standard. See Table 3. 4:2:2 16-bit Format be-

low)

– 8-bit data mode

(In this mode, video information is output in Cb Y Cr

Y order using the Y port only and running at twice the

pixel rate during which the UV port is inactive. See

Table 4. 4:2:2 8-bit Format below)

– 4-bit nibble mode

(In the nibble mode, video output data appears at bits

Y4-Y7. The clock rate for the output runs at twice the

normal output speed when in B/W mode, and 4 times

the normal output speed in when in color mode.)

– 704 x 288 format

(When programmed for this mode, the OV6620/

OV6120 pixel clock is doubled and the video output

sequence is Y0Y0Y1Y1 ... and U0U0V0V0 ... See

Figure 3, Pixel Data Bus (YUV Output), below.)

The OV6620/OV6120 imaging devices provide VSYNC,

HREF, PCLK, FODD, CHSYNC as standard output vid-

eo timing signals.

The OV6620/OV6120 image sensor can also be pro-

grammed to provide video output in RGB Raw Data 16-

bit/8-bit/4-bit format. The output sequence is matched to

the OV6620 Color Filter Pattern (See Section Figure 4.

Pixel Data Bus (RGB Output), below):

– Y channel output sequence is G R G R

– UV channel output sequence is B G B G

For 8-bit RGB Raw Data video output appears on the Y

channel (with an output sequence of B G R G) and the

UV channel is disabled.

In RGB Raw Data CCIR656 modes, the OV6620/

OV6120 imager asserts SAV (Start of Active Video) and

EAV (End of Active Video) to indicate the beginning and

the ending of HREF window. As a result, SAV and EAV

change with the active pixel window. The 8-bit RGB raw

data is also accessible without SAV and EAV informa-

tion.

The OV6620/OV6120 imagers offer flexibility in YUV

output format. The devices may be programmed as

standard YUV 4:2:2. These devices may be configured

to “swap” the U V sequence. When swapped, the UV

channel output format for 16-bit configurations be-

comes:

– V U V U...etc.

and for 8-bit configurations becomes:

– V Y U Y ...etc.

A third format is available for the 8-bit configurations

and OV6620/OV6120 enables the Y/UV sequence

swap:

– Y U Y V ...etc.

The OV6620 color single-IC camera can be configured

for use as a black and white imaging device. In this

mode, vertical resolution is greater than in color. Video

data output is provided at the Y port (pins 34:41) and the

UV port is tri-stated. The data (Y/RGB) output rate is

equivalent to operating in 16-bit mode.

The Y/UV or RGB output byte MSB and LSB can be re-

verse-ordered on the OV6620/OV6120 device. The Y7

- Y0 default sequence sets Y7 as MSB and Y0 as LSB.

Programming a reverse order configuration sets Y7 as

LSB and Y0 is MSB, with bits Y2-Y6 reversed-ordered

appropriately.

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