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2. SGH-X100 Circuit Description
2-3
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2-3.EMIESDFilter
This systemusestheEMIESDfilter,EMIF09 to protectnoisefromIFCONNECTORpart.
2-4.IFconnetor
It is18-pinconnector.Theyaredesignedto useVBAT,V_EXT_CHARGE,TXD0,RXD0,RTS0,CTS0,JIG_REC,
CHARGER_OK,RXD1,TXD1,AUX_MIC,AUX_SPKand GND.Theyconnectedto powersupplyIC,microprocessorand
signalprocessor IC.
3)BatteryChargeManagement
a complete constant-current/constant-voltagelinearcharger forsingle cell lithium-ion batteries.If ta connectedto phone,
"V_EXT_CHARGE"enable charger ICand supplycurrent to battery.whenfault condition caused,"CHG_ON"signal level
changelowto high and charger ICstop charging process.
4)Audio
REC_Pand REC_NfromOM6357 are connectedtothemainreceiver.AUXSP isconnectedtotheHandsfree kit.
MIC_Pand MIC_Nare connectedtothemainMIC.And AUX_MIC_Pand AUX_MIC_Nare connectedtotheHands
free kit.
YMU762MA3isaLSI forportabletelephonethat iscapableofplaying high qualitymusicby utilizing FMsynthesizer
and ADPCMdecorderthatareincludedinthisdevice.Asasynthesis,YMU762MA3isequipped 32 voiceswith different
tones.Since thedevice iscapableofsimultaneously generating up tosynchronouswiththeplay oftheFMsynthesizer,
various sampled voicescan beusedas sound effects.Since theplay dataofYMU762MA3areinterpretedatanytime
through FIFO,thelength ofthedata(playing period)isnot limited,sothedevice canflexiblysupportapplication suchas
incoming call melody musicdistribution service.Thehardwaresequencerbuilt inthisdevice allowsplaying ofthe
complexmusicwithoutgiving excessiveloadtotheCPUoftheportabletelephones.Moreover,theregistersoftheFM
synthesizercan beoperated directlyfor real timesound generation,allowing,forexample,utilization ofvarious sound
effectswhen using thegamesoftwareinstalledintheportabletelephone.YMU762 includesaspeakeramplifierwith high
rippleremovalratewhosemaximumoutput is550mW(SPVDD=3.6V).Thedevice isalsoequippedwithconventional
function including avibartorand a circuit forcontrolling LEDs synchornouswithmusic.Fortheheadphone,it isprovided
withastereophonicoutput terminal.Forthepurposeofenabling YMU762MA3to demonstrateitsfull capablities,Yamaha
purposeto use"SMAF:SyntheticmusicMobileApplication Format"asadatadistribution format that iscompatiblewith
multimedia.Since theSMAFtakesastructurethatsetsimportance on thesynchronization betweensound and images,
variouscontentscan bewrittenintoit including incoming call melody withwordsthatcan beusedfortraning karaoke,
and commercialchannel thatcombinestexts,imagesand sounds,and others.ThehardwaresequencerofYMU762MA3
directlyinterpretsand playsblocksrelevant tosysthesis(playing music and reproducing ADPCMwithFMsynthesizer) that
areincludedin datadistributedinSMAF.