TMDS442PNPR中文资料(2)

元器件交易网

TMDS442

SLLS757A–AUGUST2006–REVISEDMARCH2007

AprecisionresistorisconnectedexternallyfromtheVSADJpintoground,forsettingthedifferentialoutputvoltagetobecompliantwiththeTMDSstandardforallTMDSdriveroutputs.ThePREpincontrolstheTMDSoutputtobeoperatedundereitherastandardTMDSmodeoranACde-emphasismode.WhenPRE=high,a3-dBACde-emphasisTMDSoutputswingisselectedtopre-conditiontheoutputsignalstoovercomesignalimpairmentsthatmayexistbetweentheoutputoftheTMDS442andtheHDMIreceiverplacedataremotelocation.

EachsinkoutputportcanbeconfiguredwiththeSA,SB,I2CEN,andPREpins.SA1,SB1,I2CEN1,andPRE1regulatethebehaviourofsinkport1;SA2,SB2,I2CEN2,andPRE2regulatethebehaviourofsinkport2.Thesecontrolsignalsarehard-wirecontrolledbyGPIOinterface,orthroughalocalI2Cinterface.WhenGE=low,theconfigurationsaredonethroughalocalI2Cinterface,LC_SCL,LC_SDA,LC_A0,andLC_A1pins,andthe5V_ENcanbeprogrammedthroughthelocalI2Cinterface.Itisdefaulthighafterdevicepoweredon.WhenGE=high,theconfigurationsaredonethroughGPIOpinsregardlessthevalueofthe5V_ENintheinternalI2Cregisters.

Thetwobitsourceselectorpins,SAandSB,determinethesourcetransferredtothesinkport.TheinternalmultiplexerinterconnectstheTMDSchannelsandI2Cinterfacefromtheselectedsourceporttothesinkport.TheHPDoutputoftheselectedsourceportfollowsthestatusoftheHPD_SINK.Sincetwoofthesourceportswillalwaysbeunconnectedtoanyoutput,theI2CinterfacesofunselectedportsareisolatedandtheHPDoutputsofanunselectedportarepulledlow.

TheTMDSoutputsofeachofthesinkportsareenabledbasedonthesignaland5V_PWRsignal(fromtheselectedsourceport).Whenislow,foranoutputport,andthe5V_PWRsignalfromtheselectedsourceportishigh,theTMDSoutputsignalsareenabled;otherwisetheyaredisabled,andhighimpedance.

TheI2Cdriveratsinkside,SCL_SINKandSDA_SINK,areenabledbysettingI2CENhigh.WhenI2CENislow,theI2CdrivercannotforwardalowstatetotheI2Cbusconnectedatthesinkport.Ahardwireoutputvoltageselectpin,OVS,allowsadjustableoutputvoltageleveltoSCL_SINKandSDA_SINKtooptimisenoisemarginswhileinterfacingtodifferentHDMIreceivers.TheI2Cdriverofeachsourceport,SCLandSDA,iscontrolledbyits5V_PWRsignal.Avalid5-Vsignalappearingattheinputof5V_PWRenablestheI2Cdriverofthesourceport.

Thedeviceispackagedina128-pinPowerPADTQFPpackageandcharacterizedforoperationfrom0°Cto70°C.

Thesedeviceshavelimitedbuilt-inESDprotection.TheleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.

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