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CircuitDescription
2-4
2-2.Key
Thisis consisted ofkeyinterface pinsamong U302,KEYSENSE_N(0:4).Thesesignals composethe matrix.
Resultofmatrixinformsthe key statustokeyinterfaceinthe U302.Poweron/off keyis seperated fromthe
matrix.So poweron/off signal is connected withU302 to enableU601. twelvekeyLEDusethe "VBAT"supply
voltage."KEY_LED_ON"signalenablesLEDswithcurrentcontrol."HALL_SW"informsthe statusof folder
(open orclosed)tothe.Thisusesthe hall effect IC,A3210ELH.Amagnetundermain LCD enablesA3210ELH.
2-3.EMIESDFilter
This systemusesthe EMIESDfilter,SMF05 to protectnoisefromIFCONNECTORpart.
2-4. IFconnetor
It is24-pinconnector.Theyare designed to useVBATT,CF,M_TXD0,M_RXD0,RTS,CTS,JIG_ON,
HFK_DETECT,M_RXD0,M_TXD0,HFK_MIC+,HFK_MIC-,HFK_SPK+,HFK_SPK-and GND.They connected to
powersupplyIC,microprocessorand signalprocessorIC.
3.Audio
EAR1OPand EAR1ONfromU302 areconnected tothe mainspeaker.AUXOPand AUXONareconnected to
the Handsfree kit. MIC_Pand MIC_Nareconnected tothe mainMIC.And EAR_MIC1Pand EAR_MIC1Nare
connected tothe Earphone.
YMU762MA3isa LSI forportabletelephone thatis capable ofplaying high qualitymusicbyutilizing FM
synthesizerand ADPCMdecoderthatareincluded inthisdevice.
Asasynthesis,YMU762MA3isequipped 32 voiceswith different tones.Sincethe deviceis capable of
simultaneouslygenerating up tosynchronouswiththe playof the FMsynthesizer,various sampled voices can be
used as sound effects.
Sincethe playdata ofYMU762MA3 areinterpreted atanytimethrough data bus, the length of the data(playing
period)isnotlimited,sothe devicecan flexibly supportapplication such asincoming call melodymusic
distribution service.
The hardwaresequence builtinthisdevice allowsplaying of the complexmusicwithoutgiving excessiveload to
the CPUof the portabletelephones.Moreover, the registersof the FMsynthesizercan be operated directlyfor
realtimesound generation,allowing, forexample,utilization ofvarious sound effectswhen using the game
softwareinstalled inthe portabletelephone.
YMU762 includesaspeakeramplifierwith high rippleremovalratewhosemaximumoutputis550mW(SPVDD=3.
6V).Forthe headphone,itisprovided withastereophonicoutput terminal.
4.Memory
The signalsinthe MSM6200 enabletwomemories.Theyuse onlyone voltsupply voltage,VDD_LPfromthe
PM6050.This systemusesAMD'smemory,AM50DL128BG.Itis consisted of128MbitsflashNORmemoryand
32MbitsSRAM memory.Ithas16 bitdataline,AD[0~15]whichis connected toMSM6200.Ithas22 bit
address lines,A[1~22]. ROM_CSand RAM_CSsignalsis chipselect.
Inthe multi-media processor,ithasthree type memories.One is256MbitNorFlashmemoryanotheris256Mbit
NAND Flashmemoryand the otheris128MbitSDRAM memory.Multi-media processordoesn'thave a NAND
memoryinterface.Butwemakeasoftware algorithmuseforNAND memory.