OV7410 datasheet(6/18 Pages) ETC

6 / 18 page

OV7910P/OV7410P/OV7411P

Version 1.4

December 7, 1999

SINGLE IC CMOS COLOR & B/W PAL ANALOG CAMERAS

OMNIVISION TECHNOLOGIES, Inc.

Preliminary

Table 3. Video Format Selection

Format Type

RVCVO Output

(pin 17)

GYYO Output

(pin 16)

BUCO Output

(pin 15)

Pin Settings

Composite + S-Video

CVBS

AMOD0 = 0, AMOD1 = 0

RGB Components

Red

Green

Blue

AMOD0 = 1, AMOD1 = x

YUV Components

AMOD0 = 0, AMOD1 = 1

Black and White

—

AMOD0 = 0, AMOD1 = 1

(Pins 15 & 17 are undefined on the OV7410P sen-

sor)

1.3

Configuring the OV7910P/OV7410P/OV7411P

Image Sensors for Operation

The OV7910P/OV7410P/OV7411P sensors have been

designed for easy-of-use in many stand-alone applica-

tions. Most of the on-chip functions are configurable by

connecting appropriate pins high (logic “1”) or low

(logic “0”) through a 10k Ohm resistor. The image sen-

sor reads the input the pins at power up, which enables

user-defined default configurations.

The OV7910P/OV7410P/OV7411P imaging devices

also contain an I2C interface for programmatic access

to all

tion 2. “I2C Bus” on page 11). By default, the I2C port is

disabled. To enable the I2C for controlling the sensors,

a 10K Ohm pull-up resistor must be connected to

FODD/I2CEN.

With

FODD/I2CEN

pulled

high

power-up, the OV7910P/OV7410P/OV7411P image

sensors will enable the I2C port for access.

1.4

White Balance

The function of white balance in the OV7910P image

sensor is to adjust and calibrate the image devices

sensitivity on the primary (RGB) colors to match the

color cast of the light source. The Auto White Balance

(AWB) can be enabled or disabled either through an

external pin (AWBEN, pin 29) or through the I2C port. If

AWB is enabled, the image sensors continuously per-

form white balancing. A fast or slow mode of white bal-

ancing may be user-selected (AWBTM, pin 30). Fast

AWB updates color every 2 fields while slow

white balancing updates every 16 fields.

By using the I2C port, the color temperature may be

further fine tuned to the requirement of the application.

Note that the “blue” (Blue and Blue bias registers) and

“red” (Red and Red bias registers) bias control is avail-

able only through the I2C port. This function enables

the user to define a “cooler” or “warmer” background

for image capture.

1.5

Additional Picture Control

A number of functions/registers are available which

enable the user to configure OV7910P/OV7410P/

OV7411P image capturing parameters. These func-

tions include Automatic Gain Control (AGC), AGC

Gain, Automatic Exposure Control (AEC), GAMMA,

and Backlight control.

HGAIN (pin 20) may be used to set the range of AGC

Gain. A “0” on HGAIN sets AGC Gain range for 1X <->

4X, while a “1” sets the range for 1X <-> 8X. G2X (pin

19) can then be used to enhance the AGC gain range.

A “0” on G2X sets AGC gain at normal. A “1” enhances

the AGC gain by 2 (Refer to Table 1, “Pin Description,”

on page 2, pins 19 and 20 for further details). This

function may be configured through the I2C port, as

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