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CircuitDescription
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2-3
2-2-3.Key
Thisisconsisted ofkeyinterface pinsKEY_ROW(0:4)and KEY_COL(0:4)inPCF5212EL1.Thesesignalscompose
thematrix.Result ofmatrixinformsthekeystatusto keyinterface inthePCF5212EL1.Poweron/off keyis
seperatedfromthematrix.So poweron/off signal isconnectedwithPCF50603 toenablePCF50603.KeyLEDis
consisted ofsixteen blueLEDs.
keyLEDusethe3.3VLDO(U604) forasupply voltage.KEY_LED_ON signalenables sixteen blueLED.
"FLIP"informsthestatusofslide(open orclosed)tothePCF5212EL1.Thisusesthehall effectIC,
SH248CSP(U602).AmagnetunderLCDenablesSH248CSP.
2-2-4.EMIESDFilter(U501)
This systemusestheEMIESDfilter,U501 to protectnoisefromIFCONNECTORpart.
2-2-5. IFconnetor(CN302)
It is18-pinconnector.Theyaredesignedto useVBAT,V_EXT_CHARGE,USB_D+,+VBUS,USB_D-,TXD1,
RXD1,AUX_ON,EXT1,EXT2and GND.Theyconnectedto powersupplyIC,microprocessorand signalprocessor
IC.
2-2-6.BatteryCharge Management IC(U505)
Acomplete constant-current/constant-voltagelinearcharger forsingle cell lithium-ion batteriesisused.
If TAconnectedto phone,"V_EXT_CHARGE"enable charger ICand supplycurrent to battery.
Whenfault condition caused,"CHG_ON"signal levelchangelowto high and charger ICstop charging process.
2-2-7.Audio
HFR_Pand HFR_NfromPCF5212EL1are connectedtothemainspeakervia analog switches.MIC_Pand MIC_N
are connectedtothemainMICaswell.EAR1isthesource ofExternalSpeaker.YMU762 isasynthesizerLSI for
mobilephones.ThisLSIhasabuilt-inspeakeramplifier foroutputting soundsthatareused by mobilephonesin
addition to gamesoundsand ringing melodiesthatarereplayed by asynthesizer.
Thesynthesizersection adopts“stereophonichybridsynthesizersystem”thataregivenadvantagesofbothFM
synthesizersand WaveTablesynthesizerstoallowsimultaneousgeneration ofup to32FMvoicesand 32 Wave
Tablevoices.
Itprovides simultaneousgeneration ofup to40tonesby stereophonichybridsynthesizer.
YMU762 hasbuilt aspeakeramplifierofwhichmaximumout is580 mWatSPVDD=3.6Vinthisdevice.
ThereisStereophonic analog outputforHeadphone.
2-2-8.Memory(U301)
This systemusesSamsung'smemory,KAP17SG00A.TheKAP17SG00AisaMulti ChipPackageMemorywhich
combines256Mbit SynchronousBurstMulti Bank NORFlashMemoryand two 512Mbit OneNAND Flashand
128Mbit SynchronousBurstUtRAM.
Ithas16 bit dataline,HD[1~16]whichisconnectedtoPCF5212EL1and MV3018SAQ,also has24 bit address
lines,
HA[1~24].There are3chipselectsignals,CS0n_FLASH,CS4n_NAND,and CS1n_RAM.
