ov7725手册(可注释).pdf

1、 2007 OmniVision Technologies,Inc.VarioPixel,OmniVision,and the OmniVision logo are registered trademarks of OmniVision Technologies,Inc.Version 1.1,March 30,2007OmniPixel2 and CameraChip are trademarks of OmniVision Technologies,Inc.These specifications are subject to change without notice.Advanced

2、 InformationPreliminary DatasheetOV7725 Color CMOS VGA(640 x480)CAMERACHIPTM SensorOmniisionwith OmniPixel2TM TechnologyGeneral Description The OV7725 CAMERACHIP image sensor is a lowvoltage CMOS device that provides the full functionality ofa single-chip VGA camera and image processor in a smallfoo

3、tprint package.The OV7725 provides full-frame,sub-sampled or windowed 8-bit/10-bit images in a widerange of formats,controlled through the Serial CameraControl Bus(SCCB)interface.This device has an image array capable of operating at upto 60 frames per second(fps)in VGA with complete usercontrol ove

4、r image quality,formatting and output datatransfer.All required image processing functions,including exposure control,gamma,white balance,colorsaturation,hue control and more,are also programmablethrough the SCCB interface.In addition,OmniVisionsensors use proprietary sensor technology to improveima

5、ge quality by reducing or eliminating commonlighting/electrical sources of image contamination,suchas fixed pattern noise,smearing,blooming,etc.,toproduce a clean,fully stable color image.Features High sensitivity for low-light operationStandard SCCB interfaceOutput support for Raw RGB,RGB(GRB 4:2:2

6、,RGB565/555/444)and YCbCr(4:2:2)formatsSupports image sizes:VGA,QVGA,and any size scaling down from CIF to 40 x30VarioPixel method for sub-samplingAutomatic image control functions including:Automatic Exposure Control(AEC),Automatic Gain Control(AGC),Automatic White Balance(AWB),Automatic Band Filte

7、r(ABF),and Automatic Black-Level Calibration(ABLC)Image quality controls including color saturation,hue,gamma,sharpness(edge enhancement),and anti-bloomingISP includes noise reduction and defect correctionLens shading correctionSaturation level auto adjust(UV adjust)Edge enhancement level auto adjus

8、tDe-noise level auto adjustFrame synchronization capabilityOrdering Information Pb Note:The OV7725 uses a lead-free package.ProductPackageOV07725-VL1A(Color,lead-free)28-pin CSP2Applications Cellular and picture phonesToysPC MultimediaDigital still camerasKey Specifications Figure 1 OV7725 Pinout(To

9、p View)Array Size640 x 480Power SupplyDigital Core1.8VDC+10%Analog3.0V to 3.3VI/Oaa.I/O power should be 2.45V or higher when using the internalregulator for Core(1.8V);otherwise,it is necessary to providean external 1.8V for the Core power supply1.7V to 3.3VPowerRequirementsActive120 mW typical(60 f

10、ps VGA,YUV)Standby 20 ATemperature Range-20C to+70COutput Format(8-bit)YUV/YCbCr 4:2:2 RGB565/555/444 GRB 4:2:2 Raw RGB DataLens Size1/4Lens Chief Ray Angle25 non linearMax Image Transfer Rate60 fps for VGASensitivity3.0 V/(Lux sec)S/N Ratio50 dBDynamic Range60 dBScan ModeProgressiveElectronic Expos

11、ureUp to 510:1(for selected fps)Pixel Size6.0 m x 6.0 mDark Current40 mV/sWell Capacity26 Ke-Fixed Pattern Noise 0.03%of VPEAK-TO-PEAKImage Area3984 m x 2952 mPackage Dimensions5345 m x 5265 mA1ADVDDA2RSTBA3VREFHOV7725A4FSINA5SCLB1ADGNDB2VREFNB4AGNDB3AVDDB5SDAC1PWDND1D5E1D7E2D1E5DOVDDF1D9F2D3F3XCLKF

12、4DOGNDF5D2A6D0B6HREFC6VSYNCD6D4E6D6F6D8E3DVDDE4PCLK?2Proprietary to OmniVision Technologies,Inc.Version 1.1,March 30,2007OV7725Color CMOS VGA OmniPixel2 CAMERACHIP SensorOmniisionFunctional Description Figure 2 shows the functional block diagram of the OV7725 image sensor.The OV7725 includes:Image S

13、ensor Array(total array of 656 x 488 pixels,with active pixels 640 x 480 in YUV mode)Analog Signal ProcessorA/D ConvertersTest Pattern GeneratorDigital Signal Processor(DSP)Image ScalerTiming GeneratorDigital Video PortSCCB InterfaceFigure 2 Functional Block Diagramcolumnsense ampimagearrayclockexpo

14、sure/gain detecttest patterngeneratorFIFODSP*bufferbufferimagescaleranalogprocessingvideo timinggeneratorDSP*(lens shading correction,de-noise,white/black pixel correction,auto white balance,etc.)note 1exposure/gaincontrolSCCBinterfaceregistersA/DGRBD9:0videoport?Functional DescriptionVersion 1.1,Ma

15、rch 30,2007Proprietary to OmniVision Technologies,Inc.3OmniisionImage Sensor ArrayThe OV7725 sensor has an image array of 656 x 488pixels for a total of 320,128 pixels,of which 640 x 480pixels are active(307,200 pixels).Figure 3 shows across-section of the image sensor array.Figure 3 Image Sensor Ar

16、rayTiming GeneratorIn general,the timing generator controls the followingfunctions:Array control and frame generationInternal timing signal generation and distributionFrame rate timingAutomatic Exposure Control(AEC)External timing outputs(VSYNC,HREF/HSYNC,and PCLK)Analog Signal ProcessorThis block performs all analog image functions including:Automatic Gain Control(AGC)Automatic White Balance(AWB)A/D ConvertersAfter the Analog Processing block,the bayer pattern Rawsignal is fed to a 10-bit analo