Samsung SGH-C230 User manual

GSMTELEPHONE
SGH-C230
GSMTELEPHONECONTENTS
1.Specification
2.Circuit Description
3. ExplodedViews and PartsList
4. ElectricalPartsList
5.BlockDiagrams
6.PCB Diagrams
7. FlowChartofTroubleshooting

Samsung ElectronicsCo.,Ltd.MAY.2005
Printedin Korea.
CodeNo.:GH68-07224A
BASIC.
T
hisServiceManual isa propertyofSamsung ElectronicsCo.,Ltd.
A
nyunauthorized use ofManualcan bepunished underapplicable
I
nternationaland/ordomesticlaw.
ⓒ

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1. Specification
1-1
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EGSM900
Phase2DCS1800 Phase1PCS1900 Phase1
Freq.Band[MHz]
Uplink/Downlink 880~915 925~960 1710~1785 1805~1880 1850~1910 1930~1960
ARFCNrange0~124 &975~1023 512~885 512~810
Tx/Rxspacing 45MHz95MHz80MHz
Mod.Bit rate/
Bit Period 270.833kbps 3.692us270.833kbps 3.692us270.833kbps 3.692us
TimeSlot
Period/FramePeriod 576.9us 4.615ms576.9us 4.615ms576.9us 4.615ms
Modulation 0.3GMSK0.3GMSK0.3GMSK
MS Power33dBm~5dBm30dBm~0dBm30dBm~0dBm
PowerClass 5pcl~19pcl0pcl~15pcl0pcl~15pcl
Sensitivity-102dBm-100dBm-100dBm
TDMAMux 8 8 8
Cell Radius35Km2Km2Km
Operating
Temperature-20°C~+50°C
1-1.GSMGeneralSpecification

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Specification
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2. Circuit Description
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2-1.SGH-C230 RFCircuitDescription
2-1-1.RX PART
—ASM(F100)→SwitchingTx,RxpathforGSM900,DCS1800 and PCS1900 bylogic controlling.
—ASMControlLogicTruthTable
VC1VC2VC3
EGSMTX H L L
DCS/PCSTXLHL
PCS_RXL L H
—SawFILTER
ToconvertElectromagneticFieldWavetoAcousticWave and then pass thespecificfrequency band.
-GSMFILTER(F102)→For filtering thefrequency band between 925 and 960 MHz.
-DCS FILTER(F102)→For filtering thefrequency band between 1805 and 1880 MHz
-PCS FILTER(F101)→For filtering thefrequency band between 1930 and 1990 MHz.
—Crystal(U102)
To generatethe26MHzreference clockto drivethelogic and RF.
Afteradditionalprocess,thereference clockappliestotheU801 RxIQdemodulatorand TxIQmodulator.
Theoscillator forRXIQdemodulatorand Txmodulatorare controlled by serialdatatoselectchanneland usefast lock
modeforGPRShigh class operation.
—Si4210 (U100)
Thereceivesection integratesfourdifferential-input lownoise amplifiersLNAs supporting theGSM850,EGSM900,
DCS1800 and PCS1900 bands.TheLNA inputsarematchedtothe150 ohmbalanced-outputSAWfiltersthrough externa
LCmatching network.
AquadratureImage-rejectmixerdownconvertstheRFsignal toa200 KHzintermediatefrequency(IF).Themixeroutput is
amplifiedwithananalog programmablegainamplifier(PGA)that iscontrolledwiththeAGAIN.ThequadratureIF? ?
isdigitizedwith high resolution analog-to-digitalconverts(ADC).
TheADCoutput isdownconvertedto baseband withadigitalquadratureLOsignal.Digitaldecimation and FIRfilters
performdigitalfiltering and removeADCquantization noise,blockersand reference interferers.
After filtering,thedigitaloutput is scaledwithadigitalPGA,whichiscontrolledwiththeDGAIN.DACsdrive a
differentialIand Qanalog signalontotheBIP,BIN,BQPand BQN pinstointerface tostandardanalog-inputbaseband
ICs.

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CircuitDescription
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2-1-2.TX PART
Baseband IQsignalfedinto offsetPLL,thisfunction isincludedinsideofU801 chip.Thetransmit section ofU801
consistofanI/Qbaseband upconverter,an offsetphase-lockedloop (OPLL)and two 50 ohmoutputbuffersthatcan drive
anexternalPowerAmplifier(PA).Si4210 chip generatesmodulatorsignalwhich powerlevel isabout1.5dBmand fedinto
PowerAmplifier(U900).ThePAoutputpowerand power ramping arewell controlledbyAutoPowerControlcircuit.
WeuseoffsetPLL below.
Modulation Spectrum
200kHzoffset
30 kHzbandwidth
GSM-35dBc
DCS-35dBc
PCS-35dBc
400kHzoffset
30 kHzbandwidth
GSM-66dBc
DCS-65dBc
PCS-66dBc
600kHz~1.8MHzoffset
30 kHzbandwidth
GSM-75dBc
DCS-68dBc
PCS-75dBc
2-2.Baseband Circuitdescription ofSGH-C230
2-2-1.CSP2200B1
—Power Management
Sevenlow-dropoutregulatorsdesignedspecificallyforGSMapplicationspowertheterminaland helpensureoptimal
systemperformance and long batterylife.AprogrammableLDO provides supportfor1.8V,3.0VSIMs,while a self-
resetting,electronicallyfusedswitchsuppliespowertoexternalaccessories.Ancillarysupportfunctions,suchastwoLED
driversand twocall-alertdrivers,aidinreducing both boardarea and systemcomplexity.Afour-wireserial interface
unit(SIU)providesaccess tocontroland configuration registers.Thisinterface givesamicroprocessor full controlofthe
CSP2200B1and enables systemdesignerstomaximize bothstandby and talktimes.Error reporting isprovided via an
interruptsignaland statusregister.Supervisoryfunctions.including aresetgenerator,aninputvoltagemonitor,and a
thermalmonitor,supportreliablesystemdesign.Thesefunctionsworktogethertoensurepropersystembehaviorduring
start-up orinthe eventofafault condition(lowmicroprocessorvoltage,insufficientbatteryenergy,orexcessivedie
temperature).
—BatteryChargeManagement
Abatterychargemanagementblock,incorporating aninternalPMOSswitch,and an 8-bit ADC,providesfast,efficient
charging ofsingle-cell Li-Ion battery.Usedinconjunction witha current-limited voltagesource,thisblocksafely
conditionsnear-deadcellsand providestheoption ofhaving fast-charge and top-off controlledinternally orby thesystem's
microprocessor.

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CircuitDescription
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—BacklightLED Driver
ThebacklightLEDdriverisalow-side,programmable currentsource designedtocontrol thebrightness ofthekeyboard
illumination.LED1_DRViscontrolled viaLED1_[0:2]and can beprogrammedtosink from15mAto 60mAin 7.5mA
steps.LED2_DRViscontrolled viaLED2_[0:2]and can beprogrammedtosink from5mAto 40mAin 5mAsteps.
BothLEDdriversare capableofsinking theirmaximumoutputcurrentataworst-casemaximumoutputvoltageof0.6V.
Forefficientuse,theLEDsisconnected betweenthebatteryand theLED_DRVoutput.
—VibratorMotorDriver
Thevibratormotordriverisaindependentvoltageregulatorto driveasmall dcmotorthatsilentlyalertstheuserofan
incoming call.Thedriverisa3.3Vconstantsource whilesinking up to 140mAand controlledbyenablesignalofmain
chip.Forefficientuse and safety,thevibratormotorshould be connected betweentheregulatoroutputand theground.
2-2-2Connector
—JTAGConnector
TridenthastwoJTAG portswhichareforARMcore and DSP core(DSP16000).Sothis systemhastwo portconnector
fortheseports.Pins'initialsforARMcore are'CP_' and pins'initialsforDSP core are'DSP_'.
CP_TDIand DSP_TDIsignalareusedforinputofdata.CP_TDO and DSP_TDO signalsareusedfortheoutputofthe
data.CP_TCKand DSP_TCKsignalsareusedforclock becauseJTAG communication isasynchronous.CP_TMSand
DSP_TMSsignalsaretestmodesignals.Thedifference betweentheseistheRESET_INTsignalwhichisforARMcore
RESET.
—Keypadconnector
Thisisconsisted ofkeyinterface pinsinthetrident,KEY_ROW[0~4]and KEY_COL[0~4].Thesesignalscomposethe
matrix.Result ofmatrixinformsthekeystatusto keyinterface inthetrident.Somepinsare connectedto varistor for
ESDprotection.And poweron/off keyis seperatedfromthematrix.
So poweron/off signal isconnectedwithCSP2200 toenableCSP2200.
NinekeyLEDusethe +VBATT supply voltage.These are connectedtoBACKLIGHTsignal intheCSP2200.
This signalenablesLEDswithcurrentcontrol.
—EMIFiltering
This systemusestheEMIFiltertoreduce noisefromLCDpart.Some controlsignalsare connectedtoLCD withoutEMI
filtering.

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2-2-3. IFconnetor
It is24-pinconnector,and separatedintotwo parts.Oneisapowersupply partformainsystem.And theotheris
designedto useSDS,DEBUG,DLC-DETECT,JIG_ON,VEXT,VTEST,VF,and GND.Theyconnectedto powersupply
IC,microprocessorand signalprocessor IC.
2-2-4.Audio
AOUTAP,AOUTAN fromCSP2200 isconnectedtothespeakervia analog switch.AOUTBPand AOUTBNare connected
tothe ear-micspeakervia ear-jack.MICINand MICOUTare connectedtothemainMIC.And AUXINand AUXOUT
are connectedtotheEar-mic.
YMU762MA3isaLSI forportabletelephonethat iscapableofplaying high qualitymusicby utilizing FMsynthesizer
and ADPCMdecorderthatareincludedinthisdevice.
Asasynthesis,YMU762MA3isequipped 16 voiceswith different tones.Since thedevice iscapableofsimultaneously
generating up tosynchronouswiththeplay oftheFMsynthesizer,various sampled voicescan beusedas sound effects.
Since theplay dataofYMU762MA3areinterpretedatanytimethrough FIFO,thelength ofthedata(playing period)isnot
limited,sothedevice canflexiblysupportapplication suchasincoming call melody musicdistribution service.The
hardwaresequencerbuilt inthisdevice allowsplaying ofthe complexmusicwithoutgiving excessiveloadtotheCPUof
theportabletelephones.Moreover,theregistersoftheFMsynthesizercan beoperated directlyfor real timesound
generation,allowing,forexample,utilization ofvarious sound effectswhen using thegamesoftwareinstalledinthe
portabletelephone.
YMU762 includesaspeakeramplifierwith high rippleremovalratewhosemaximumoutput is550mW(SPVDD=3.6V).
Thedevice isalsoequippedwithconventionalfunction including avibartorand a circuit forcontrolling LEDs synchornous
withmusic.
Fortheheadphone,it isprovidedwithastereophonicoutput terminal.
Forthepurposeofenabling YMU762MA3to demonstrateitsfull capabilities,Yamahapurposeto use"SMAF:Synthetic
musicMobileApplication Format"asadatadistribution format that iscompatiblewithmultimedia.
Since theSMAFtakesastructurethatsetsimportance on thesynchronization betweensound and images,variouscontents
can bewrittenintoit including incoming call melody withwordsthatcan beusedfortraining karaoke,and commercial
channel thatcombinestexts,imagesand sounds,and others.ThehardwaresequencerofYMU762MA3 directlyinterprets
and playsblocksrelevant tosynthesis(playing music and reproducing ADPCMwithFMsynthesizer) thatareincludedin
datadistributedinSMAF.
2-2-5.Memory
This systemusesSHARP'smemory,LRS18B0.
It isconsisted of256Mbitsflashmemoryand 64MbitsSCRAM.Ithas16 bit dataline,D[0~15]whichisconnectedto
trident,LCDorCSP2200.Ithas23 bit address lines,A[1~23].Theyare alsoconnected.CP_CSROMENsignal,chip
selectsignal inthetrident,enableflashmemories.They usesupply voltages,VCCDand VCC_1.8A.

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During wrting process,CP_WENislowand it enableswriting process toflashmemoryand SCRAM.During reading
process,CP_OENislowand it output information whichislocatedat the address fromthetrident intheflashmemory or
SCRAMto datalines.Eachchipselectsignalsinthetridentselectflashmemory orSCRAM.Reading orwriting
procedureisprocessedafterCP_WENorCP_OENisenabled.MemoriesuseFLASH_RESET,whichisbufferedsignalof
RESET fromCSP2200,forESDprotection.A[0]signalenableslowerbyteofSCRAMand UPPER_BYTE signalenables
higherbyteofSCRAM.
2-2-6.Trident
Trident isconsisted ofARMcore and DSP core.Ithas20K*16bitsRAM144K*16bitsROMintheDSP.Ithas
4K*32bitsROMand 2K*32bitsRAMintheARMcore.DSP isconsisted oftimer,onebit input/outputunit(BIO),JTAG,
EMIand HDS(HardwareDevelopmentSystem).ARMcoreisconsisted ofEMI,PIC(ProgrammableInterruptController),
reset/power/clock unit,DMAcontroller,TIC(TestInterface Controller),peripheralbridge,PPI,SSI(SynchronousSerial
Interface),ACCs(Asynchronouscommunicationscontrollers),timer,ADC,RTC(Real-TimeClock)and keyboardinterface.
DSP_AB[0~8],address linesofDSP core and DSP_DB[0~15],datalinesofDSP core are connectedtoCSP2200.A[0~20],
address linesofARMcore and D[0~15],datalinesofARMcore are connectedtomemory,LCDand YMU762.
ICP(InterprocessorCommunication Port)controlsthe communication betweenARMcore and DSP core.
CSROMEN,CSRAMENand CS1NtoCS4NintheARMcore are connectedtoeachmemory.WENand OENcontrol the
process ofmemory.ExternalIRQ(InterruptReQuest)signalsfromeach units,suchas,YMU,Ear-jack,Ear-mic and
CSP1093,needthe compatibleprocess.
SomePPIpinshasmany specialfunctions.CP_KB[0~9] receivethestatusfromkeyFPCB and areusedforthe
communicationsusing datalink cable(DEBUG_DTR/RTS/TXD/RXD/CTS/DSR).
And UP_CS/SCLK/SDI,controlsignalsforCSP2200 areoutputtedthrough PPIpins.Ithas signalportfor
charging(CHG_DET),SIM_RESET and FLIP_SNSwithwhichweknowsopen.closedstatusof folder.Ithas JTAG control
pins(TDI/TDO/TCK) forARMcore and DSP core.Itrecieves13MHz clockinCKIpinfromexternalTCXO and receives
32.768KHz clockfromX1RTC.ADC(Analog toDigitalConvertor) partreceivesthestatusoftemperature,batterytype and
battery voltage.And controlsignals(DSP_INT,DSP_IOand DSP_RWN) forDSP core areused.ItenablesmainLCD with
DSP IPpins.
2-2-7.CSP2200
CSP2200 isintegratedthetiming and controlfunctionsforGSM2+mobile application withtheADCand DACfunctions,
and powermanagementblock.TheCSP2200 interfacestothetrident,via a 16-bit parallel interface.Itservesasthe
interface thatconnectsaDSP totheRFcircuitryinaGSM2+mobiletelephone.DSP canload 148 bitsofburstdata
intoCSP2200’ sinternalregister,and programCSP2200’ sevent timing and controlregisterwiththe exact timetosend the
burst.Whenthetiming portion ofthe event timing and controlregistermatchestheinternalquarter-bit counterand internal
frame counter,the148 bitsintheinternalregisterareGMSKmodulatedaccording toGSM2+standards.Theresulting
phaseinformation istranslatedintoIand Qdifferentialoutputvoltagesthatcan be connected directlytoanRFmodulator
at theTXOPand TXON pins.TheDSP isnotifiedwhenthetransmission iscompleted.For receiving baseband data,a
DSP can programCSP2200’ sevent timing and controlregisterwiththe exact timetostartreceiving Iand Qsamples
through TXIPand TXINpins.

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Whenthat timeisreached,the controlportion ofthe event timing and controlregisterwill start thebaseband receive
section converting Iand Qsamplepairs.Thesamplesarestoredinadouble-bufferedregisteruntil theregistercontains32
samplepairs.CSP2200 then notifiestheDSP which has sampletimetoreadtheinformation outbeforethenext32
samplepairsarestored.Thevoice band ADCconverterissuesaninterrupt totheDSP wheneverit finishesconverting a
16-bit PCMword.TheDSP thenreadsthenewinputsample and simultaneouslyloadsthevoice band outputDAC
converterwithanewPCMoutputword.Thevoice band outputcan be connected directlytoaspeakerviaAOUTAN and
AOUTAPpinsand be connectedtoaEar-micspeakerviaAOUTBNand AOUTBPpins.
There are7LDOswhicharepowersourcesofmicroprocessor,LCD,etc.These7LDOsoutputareprogrammable.