Preliminary
OMNIVISION TECHNOLOGIES, Inc.
OV7910P/OV7410P/OV7411P
SINGLE IC CMOS COLOR & B/W PAL ANALOG CAMERAS
Table 3. Video Format Selection
RVCVO Output
GYYO Output
BUCO Output
(pin 15)
Format Type
(pin 17)
Pin Settings
(pin 16)
CVBS
Red
YO
CO
AMOD0 = 0, AMOD1 = 0
Composite + S-Video
RGB Components
AMOD0 = 1, AMOD1 = x
AMOD0 = 0, AMOD1 = 1
AMOD0 = 0, AMOD1 = 1
Green
Y
Blue
Cr
—
Cb
—
YUV Components
Black and White
Y
(Pins 15 & 17 are undefined on the OV7410P sen-
sor)
1.3 Configuring the OV7910P/OV7410P/OV7411P
Image Sensors for Operation
to all
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.
2
register functions (For further details on I C, see Sec-
2
2
tion 2. “I C Bus” on page 11). By default, the I C port is
2
disabled. To enable the I C for controlling the sensors,
a 10K Ohm pull-up resistor must be connected to
FODD/I2CEN. With FODD/I2CEN pulled high at
power-up, the OV7910P/OV7410P/OV7411P image
The OV7910P/OV7410P/OV7411P imaging devices
2
also contain an I C interface for programmatic access
2
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
sensors will enable the I C 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
white balancing updates every 16 fields.
2
By using the I C 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-
2
external pin (AWBEN, pin 29) or through the I C port. If
2
and Backlight control.
able only through the I C port. This function enables
the user to define a “cooler” or “warmer” background
for image capture.
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.
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,
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
2
function may be configured through the I C port, as
6
Version 1.4
December 7, 1999
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