Functional Description
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These two functions can be controlled separately using
SCCB register bit COME[6] (see “COME” on page 12) for
the mirror function and register bit COMJ[0] (see “COMJ”
on page 13) for the vertical flip function.
Additional Picture Controls
The OV7930 CAMERACHIP provides additional picture
control functions to enhance image quality and chip
performance.
Multi-Chip Synchronize
Automatic Gain Control (AGC)
The OV7930 CAMERACHIP provides the multi-chip
Synchronize function where one chip works as the master
and all others as slave devices. The master chip provides
the frame synchronize signal through the FODD pin (pin
23 - see “FODD/HGAIN” on page 5). All slave devices
accept the frame synchronize signal through the FSI pin
(pin 20 - see “FSI” on page 4). This mode allows all
devices to synchronize together.
The default gain range is 1x - 8x while the user can set the
gain range up to 4x or 16x.
Brightness Control
Brightness can be controlled either by internal automatic
algorithms or by the user through the following SCCB
register bits:
Chip Configuration
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BRT[7:0] (see “BRT” on page 11)
The OV7930 CAMERACHIP has been designed for
ease-of-use in many stand-alone applications. Most of the
on-chip functions are configurable by connecting the
appropriate pins high (logic "1") or low (logic "0") through
a 10 KΩ resistor. The CAMERACHIP reads the input pins at
power up which enable user-defined default
configurations.
Gamma Correction
The OV7930 has luminance and chrominance Gamma
correction through the GAMMA pin (pin 21 - see
“GAMMA” on page 4).
The OV7930 CAMERACHIP also has a SCCB slave
interface for programmable access to all registers
functions. Refer to OmniVision Technologies Serial
Camera Control Bus (SCCB) Specification for detailed
usage of the serial control port.
Backlight Control
The OV7930 manages backlight conditions through
register bit COME[4] (see “COME” on page 12).
NOTE Once the SCCB interface is enabled (pin 14 -
see “SCCB_E” on page 4), the following pin
assignment functions will be ignored and
functions will be defined by the related SCCB
register. These pins are:
Color Saturation
Color saturation can be updated manually through the
SCCB register bits SAT[7:4] (see “SAT” on page 11).
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ABRT (pin 3)
BKLT (pin 4)
VFLIP (pin 15)
GAMMA (pin 21)
MIR (pin 22)
HGAIN (pin 23)
FASTB (pin 25)
Hue Adjustment
Image hue can be adjusted through the SCCB register bits
HUE[5:0] (see “HUE” on page 11).
Version 1.1, January 15, 2003
Proprietary to OmniVision Technologies
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