ov7725手册(可注释).pdf

ov7725手册(可注释).pdf

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2007OmniVisionTechnologies,Inc.VarioPixel,OmniVision,andtheOmniVisionlogoareregisteredtrademarksofOmniVisionTechnologies,Inc.Version1.1,March30,2007OmniPixel2andCameraChiparetrademarksofOmniVisionTechnologies,Inc.Thesespecificationsaresubjecttochangewithoutnotice.AdvancedInformationPreliminaryDatasheetOV7725ColorCMOSVGA（640x480）CAMERACHIPTMSensorOmniisionwithOmniPixel2TMTechnologyGeneralDescriptionTheOV7725CAMERACHIPimagesensorisalowvoltageCMOSdevicethatprovidesthefullfunctionalityofasingle-chipVGAcameraandimageprocessorinasmallfootprintpackage.TheOV7725providesfull-frame,sub-sampledorwindowed8-bit/10-bitimagesinawiderangeofformats,controlledthroughtheSerialCameraControlBus（SCCB）interface.Thisdevicehasanimagearraycapableofoperatingatupto60framespersecond（fps）inVGAwithcompleteusercontroloverimagequality,formattingandoutputdatatransfer.Allrequiredimageprocessingfunctions,includingexposurecontrol,gamma,whitebalance,colorsaturation,huecontrolandmore,arealsoprogrammablethroughtheSCCBinterface.Inaddition,OmniVisionsensorsuseproprietarysensortechnologytoimproveimagequalitybyreducingoreliminatingcommonlighting/electricalsourcesofimagecontamination,suchasfixedpatternnoise,smearing,blooming,etc.,toproduceaclean,fullystablecolorimage.FeaturesHighsensitivityforlow-lightoperationStandardSCCBinterfaceOutputsupportforRawRGB,RGB（GRB4:

2:

2,RGB565/555/444）andYCbCr（4:

2:

2）formatsSupportsimagesizes:

VGA,QVGA,andanysizescalingdownfromCIFto40x30VarioPixelmethodforsub-samplingAutomaticimagecontrolfunctionsincluding:

AutomaticExposureControl（AEC）,AutomaticGainControl（AGC）,AutomaticWhiteBalance（AWB）,AutomaticBandFilter（ABF）,andAutomaticBlack-LevelCalibration（ABLC）Imagequalitycontrolsincludingcolorsaturation,hue,gamma,sharpness（edgeenhancement）,andanti-bloomingISPincludesnoisereductionanddefectcorrectionLensshadingcorrectionSaturationlevelautoadjust（UVadjust）EdgeenhancementlevelautoadjustDe-noiselevelautoadjustFramesynchronizationcapabilityOrderingInformationPbNote:

TheOV7725usesalead-freepackage.ProductPackageOV07725-VL1A（Color,lead-free）28-pinCSP2ApplicationsCellularandpicturephonesToysPCMultimediaDigitalstillcamerasKeySpecificationsFigure1OV7725Pinout（TopView）ArraySize640x480PowerSupplyDigitalCore1.8VDC+10%Analog3.0Vto3.3VI/Oaa.I/Opowershouldbe2.45VorhigherwhenusingtheinternalregulatorforCore（1.8V）;otherwise,itisnecessarytoprovideanexternal1.8VfortheCorepowersupply1.7Vto3.3VPowerRequirementsActive120mWtypical（60fpsVGA,YUV）Standby20ATemperatureRange-20Cto+70COutputFormat（8-bit）YUV/YCbCr4:

2:

2RGB565/555/444GRB4:

2:

2RawRGBDataLensSize1/4LensChiefRayAngle25nonlinearMaxImageTransferRate60fpsforVGASensitivity3.0V/（Luxsec）S/NRatio50dBDynamicRange60dBScanModeProgressiveElectronicExposureUpto510:

1（forselectedfps）PixelSize6.0mx6.0mDarkCurrent40mV/sWellCapacity26Ke-FixedPatternNoise0.03%ofVPEAK-TO-PEAKImageArea3984mx2952mPackageDimensions5345mx5265mA1ADVDDA2RSTBA3VREFHOV7725A4FSINA5SCLB1ADGNDB2VREFNB4AGNDB3AVDDB5SDAC1PWDND1D5E1D7E2D1E5DOVDDF1D9F2D3F3XCLKF4DOGNDF5D2A6D0B6HREFC6VSYNCD6D4E6D6F6D8E3DVDDE4PCLK?

2ProprietarytoOmniVisionTechnologies,Inc.Version1.1,March30,2007OV7725ColorCMOSVGAOmniPixel2CAMERACHIPSensorOmniisionFunctionalDescriptionFigure2showsthefunctionalblockdiagramoftheOV7725imagesensor.TheOV7725includes:

ImageSensorArray（totalarrayof656x488pixels,withactivepixels640x480inYUVmode）AnalogSignalProcessorA/DConvertersTestPatternGeneratorDigitalSignalProcessor（DSP）ImageScalerTimingGeneratorDigitalVideoPortSCCBInterfaceFigure2FunctionalBlockDiagramcolumnsenseampimagearrayclockexposure/gaindetecttestpatterngeneratorFIFODSP*bufferbufferimagescaleranalogprocessingvideotiminggeneratorDSP*（lensshadingcorrection,de-noise,white/blackpixelcorrection,autowhitebalance,etc.）note1exposure/gaincontrolSCCBinterfaceregistersA/DGRBD9:

0videoport?

FunctionalDescriptionVersion1.1,March30,2007ProprietarytoOmniVisionTechnologies,Inc.3OmniisionImageSensorArrayTheOV7725sensorhasanimagearrayof656x488pixelsforatotalof320,128pixels,ofwhich640x480pixelsareactive（307,200pixels）.Figure3showsacross-sectionoftheimagesensorarray.Figure3ImageSensorArrayTimingGeneratorIngeneral,thetiminggeneratorcontrolsthefollowingfunctions:

ArraycontrolandframegenerationInternaltimingsignalgenerationanddistributionFrameratetimingAutomaticExposureControl（AEC）Externaltimingoutputs（VSYNC,HREF/HSYNC,andPCLK）AnalogSignalProcessorThisblockperformsallanalogimagefunctionsincluding:

AutomaticGainControl（AGC）AutomaticWhiteBalance（AWB）A/DConvertersAftertheAnalogProcessingblock,thebayerpatternRawsignalisfedtoa10-bitanalo