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OV7910 Datasheet(Fiches technique) 6 Page - List of Unclassifed Manufacturers

Numéro de pièce OV7910
Description  SINGLE-CHIP CMOS COLOR PAL CAMERA
Télécharger  18 Pages
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OV7910P/OV7410P/OV7411P
6
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
YO
CO
AMOD0 = 0, AMOD1 = 0
RGB Components
Red
Green
Blue
AMOD0 = 1, AMOD1 = x
YUV Components
Cr
Y
Cb
AMOD0 = 0, AMOD1 = 1
Black and White
Y
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
register functions (For further details on I2C, see Sec-
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
at
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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