OV7620 datasheet(9/60 Pages) ETC

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OV7620 Product Specifications - Rev. 1.2 (5/13/00)

OMNIVISION TECHNOLOGIES INC.

Preliminary Company Confidential

To decrease data transfer rate while high resolution image unnecessary, OV7620 provide a so-

lution, that is it can output QVGA resolution image. This mode decrease pixel rate one half. The

resolution default value is 320x240 and can be programmable. Every line only output one half

data. For Interlaced Mode, all field line output (320), for Progressive Scan Mode, only one half

line data output.

The digital video port also offer RGB Raw Data 16 Bit/8 Bit format. The output sequence is

matched to OV7620 Color Filter Pattern, that is UV channel output sequence is G R G R ..., Y

Channel output sequence is B G B G,....To 8 Bit RGB Raw data output format, just use Y channel

and disable UV channel, output sequence is B G R G ....

OV7620 support CCIR656 YCrCb 4:2:2 digital output format. The SAV(Start of Active Video) and

EAV(End of Active Video) is just at the beginning and the end of HREF window. So the position

of SAV and EAV is changing with active pixel window. Also you can get 8 bit RGB raw data with

SAV and EAV information.

OV7620 support some flexible YUV output format. One is standard YUV 4:2:2. Another is U V

sequence swap format, that means UV channel output V U V U ...(16 Bit) and V Y U Y ...(8 Bit).

The 3rd format is Y/UV sequence swap in 8 Bit output, that is Y U Y V ....

OV7620 can be use as black&white camera. At this mode, it’s vertical resolution will be higher

than color mode. All data will be output from Y port and UV port will be tri-state. Data (Y/RGB)

output rate is same as 16 Bit mode.

OV7620 can be programmable to swap Y/UV or RGB output byte MSB and LSB. Y7 - Y0 default

sequence is Y7 is MSB and Y0 is LSB. When swap, Y7 is LSB and Y0 is MSB, relative middle

bits are swapped.

An important factor about digital camera is how convenient the interface is, OV7620 has made

the frame rate programmable and the A/D synchronous to the actual pixel rate. Essentially, it is

a whole image capture system in a single chip. Since the internal AEC has a range of 1:260, and

AGC have 24dB, for the most of applications, the camera can adjust itself to meet the lighting

condition without user intervention.

OV7620 support hardware/software RESET function: when RESET pin tie to high, whole chip

will be reset including all register. Hardware sleeping mode: when PWDN tie to high, chip clock

will be stop and internal circuit reset except all SCCB register. Also there is a SCCB control soft-

ware reset control register 12 bit 7, which is same as hardware RESET pin function.

OV7620 hardware reset time minimum is 1 ms.

OV7620 support hardware/software power saving mode. When the PWDN pin tie to high, whole

chip will be set to power down status without any current consumption. For software power down

control, all current set to zero except crystal circuit. In power down mode, all SCCB register value

will be kept.

Two control mechanism have been built into OV7620: A. one time read-in of pin states at power

up or RESET status, including hardware and software reset; B. SCCB interface. Two methods

are mutually exclusive, only one is used at a time, selected by pin SBB. Method A has limited

access to full chip features.

The power up reset method is a one time setting, the setting can not be altered later. The pins

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