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CircuitDescription
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4.Key
Thisisconsisted ofkeyinterface pinsKEY_ROW(0:4)and KEY_COL(0:4)inPCF5213EL1.Thesesignalscomposethe
matrix.Result ofmatrixinformsthekeystatusto keyinterface inthePCF5213EL1.Poweron/off keyis seperatedfrom
thematrix.So poweron/off signal isconnectedwithPCF50603 toenablePCF50603.KeyLEDisconsisted ofsixwhite
LEDsforsub keyand twelvewhiteLEDsformain key.WhiteLEDforsub key usetheVBATvoltage.
"SLIDER_KEY_ON"signalenablesTransistor forsub key backlight.
Main keyLEDusethe3.3VLDO forasupply voltage.KEY_LED_ON signalenableseightwhiteLED.
"FLIP"informsthestatusofslide(open orclosed)tothePCF5213EL1.Thisusesthehall effectIC,A3212ELH.
AmagnetunderLCDenablesA3212ELH.
5.EMIESDFilter
This systemusestheEMIESDfilter,U500 to protectnoisefromIFCONNECTORpart.
6.IFconnetor
It is18-pinconnector.Theyaredesignedto useVBAT,V_EXT_CHARGE,USB_D+,+VBUS,USB_D-,TXD1,RXD1,
AUX_ON,EXT1,EXT2,HFK_SPK,HFK_MICand GND.Theyconnectedto powersupplyIC,microprocessorand signal
processor IC.
7.BatteryChargeManagement
Acomplete constant-current/constant-voltagelinearcharger forsingle cell lithium-ion batteries.
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.
8.Audio
HFR_Pand HFR_NfromPCF5213El1are connectedtothemainspeakervia analog switches.MIC_Pand MIC_N
are connectedtothemainMICaswell.EAR1isthesource ofExternalSpeaker.YMU765 isasynthesizerLSI for
mobilephones.ThisLSIhasabuilt-inspeakeramplifier foroutputting soundsthatareused by mobilephonesinaddition
to gamesoundsand ringing melodiesthatarereplayed by asynthesizer.
Thesynthesizersection adopts“stereophonichybridsynthesizersystem”thataregivenadvantagesofbothFM
synthesizersand WaveTablesynthesizerstoallowsimultaneousgeneration ofup to32FMvoicesand 32 Wave
Tablevoices.
Itprovides simultaneousgeneration ofup to64tonesby stereophonichybridsynthesizer.
YMU765 hasbuilt aspeakeramplifierofwhichmaximumout is580 mWatSPVDD=3.6Vinthisdevice.
ThereisStereophonic analog outputforHeadphone.
9.Memory
This systemusesSamsung'smemory,KBJ10KB00M.TheKBJ10KB00MisaMulti ChipPackageMemorywhich
combines256Mbit SynchronousBurstMulti Bank NORFlashMemoryand two 512Mbit OneNAND Flashand
128Mbit SynchronousBurstUtRAM.
Ithas16 bit dataline,HD[1~16]whichisconnectedtoPCF5213 and MV319,also has24 bit address lines,
HA[1~24].There are3chipselectsignals,CS0n_FLASH,CS4n_NAND,and CS1n_RAM.
IntheWrting process,WEnisfallentolowand it enableswriting process to operate.During reading process,
OEnisfallentolowand it enablesreading process to operate.EachchipselectsignalsinthePCF5213 choose
differentmemories.