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Part: OV7930
Category:
Sensors
-> Image Sensors
Description: Color NTSC 510 X 492 Analog CMOS Camerachipstm
Company: OmniVision Technologies
Datasheet: Download OV7930 datasheet File size : 827 kB
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Omni
General Description
ision
TM
Advanced Information Preliminar y Datasheet OV7930 Color CMOS Analog CAMERACHIPTM Applications
· · · · · · · · · Video Conferencing Video Phones Video E-mail PC Multimedia Toys Security Surveillance Finger Printing Medical and Dental Equipment
The OV7930 (color) is a high performance quarter-inch CMOS CAMERACHIPTM designed for all applications requiring a small footprint, low voltage, low power consumption and low cost color video camera. The device supports NTSC composite video output and can directly interface with a VCR TV monitor or other 75 ohm terminated input with 2X standard TV signal range. The OV7930 CAMERACHIPs require only a single 5-volt DC power supply and have been designed for very low power operation.
Features
· · · · · · · Single chip 1/4" lens video camera Composite video: NTSC Sensitivity boost (+27 dB)/AGC ON/OFF Automatic exposure/gain/white balance External frame sync capability Aperture correction SCCB programmable controls: · · · · Color saturation Brightness Hue White balance Exposure Gain Gamma curve
Key Specifications
Array Size Power Supply Without Loading Po wer With 75 ohm Requirements Loading Image Area Auto Electronic Exposure Time Minimum Illumination (3000K) S/N Ratio Dynamic Range Pixel Size Dark Current Fixed Pattern Noise Package Dimensions 510 x 492 5 VDC + 5% 20 mA 46 dB > 70 dB 7.86 µm x 6.25 µm < 100 mV/s < 0.03% VPEAK-TO-PEAK 0.45 in. x 0.45 in.
Figure 1 OV7930 Pin Diagram
AW B 1S SIO _ D 27 AV DD BKL T SI O_ C 26 AG ND 1 AB RT 3
Aperture correction Gamma correction (0.45) ON/OFF Low power consumption +5 volt only power supply Wide dynamic range, anti-blooming, zero smearing
4
2
28
NC VREQ VRCHG NC
5 6 7 8 9 10 11
25 24 23
FASTB PWDN FODD/HGAIN VHS/MIR GAMMA FSI DGND
Ordering Information
Product OV7930 (Color, VGA, NTSC, CVO) Packages
OV7930
22 21 20 19
NC
CLCC-28, PLCC-28
CVO OVDD
12 E VD D
13 EG ND
14 S CCB _ E
15 VP XO /V FL P
16 XC LK 1
17 X CL K2
18 DV DD
Version 1.1, January 15, 2003
Proprietary to OmniVision Technologies
1
OV7930
Color CMOS Analog CAMERACHIPTM
Omni
ision
Functional Description
This section describes the various functions of the OV7930. Refer to Figure 2 for the functional block diagram of the OV7930.
Figure 2 Functional Block Diagram
AMP Column Sample/Hold
Channel Control
Analog Signal Processor (ASP)
NTSC Video Encoder
CVO
Row Select
Image Array (528 X 500)
Gain Control
Balance Control
ASP Control
Clock/Timing Generator and Control Logic
Control Register Bank
SCCB Slave Interface
AW B1 S
VH S
F AST B
PW DN
G AM M A
XCL K1
XCL K2
RE SET
F O DD
F SI
VP XO
B KLT
ABRT
Video Standards
NTSC TV standards are implemented and available as output in the OV7930 CAMERACHIP. Note that the accuracy and stability of the crystal clock frequency is important to avoid unwanted color shift in the TV video system. A 14.31818 MHz crystal is recommended when using the OV7930 CAMERACHIP.
Image Sensor Functions White Balance
The function of white balance in the OV7930 CAMERACHIP is to adjust and calibrate the image device 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 by SCCB register bit COMD[1] (see "COMD" on page 12).
Video Format
The OV7930 CAMERACHIP supports Composite (CVBS) video format only. Composite signals are generated from the built-in NTSC TV encoder.
Mirror and Vertical Flip
The OV7930 has pin control functions: · Mirror (pin22 - see "VHS/MIR" on page 4) · VFLIP (pin 15 input - see "VPXO/VFLP" on page 4)
2
Proprietary to OmniVision Technologies
Version 1.1, January 15, 2003
SCC B_E
SIO_C
SIO_D
Omni
ision
Functional Description
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
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.
Automatic Gain Control (AGC)
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: · BRT[7:0] (see "BRT" on page 11)
Chip Configuration
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 K resistor. The CAMERACHIP reads the input pins at power up which enable user-defined default configurations. 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. 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: · ABRT (pin 3) · BKLT (pin 4) · VFLIP (pin 15) · GAMMA (pin 21) · MIR (pin 22) · HGAIN (pin 23) · FASTB (pin 25)
Gamma Correction
The OV7930 has luminance and chrominance Gamma correction through the GAMMA pin (pin 21 - see "GAMMA" on page 4).
Backlight Control
The OV7930 manages backlight conditions through register bit COME[4] (see "COME" on page 12).
Color Saturation
Color saturation can be updated manually through the SCCB register bits SAT[7:4] (see "SAT" on page 11).
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
3
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