LG ELECTRONICS LGC500W Dual Mode Cellular Phone (AMPS/CDMA) User Manual service manual

LG Electronics, Inc. Dual Mode Cellular Phone (AMPS/CDMA) service manual

Contents

Service Manual

LGICLG Information & Communications, Ltd. CDMA PORTABLE CELLULAR PHONE LGC-500W SERVICE MANUAL
LGC-500W 1LGICLG Information & Communications, Ltd.Table of Contents General Introduction .............................................................................................................................................................. 2CHAPTER 1. System Introduction 1. System Introduction ...................................................................................................................................... 2. Features and Advantages of CDMA Mobile Phone (For AMPS as well) ..................................................... 3. Structure and Functions of CDMA Mobile Phone (For AMPS as well) ....................................................... 4. Specification .................................................................................................................................................. 5. Installation .....................................................................................................................................................CHAPTER 2. NAM Input Method(Inputting of telephone numbers included) 1. Telephone Number and NAM Programming Method ...................................................................................CHAPTER 3. Circuit Description 1. RF Transmit/Receive Part ............................................................................................................................. 2. Digital/Voice Processing Part ....................................................................................................................... Appendix ................................................................................................................................................. 1. Assembly and Disassembly Diagram 2. Block & Circuit Diagram 3. Component Layout 4. Part List 5. Accessories - Desktop Charger - Travel Charger - Cigar Lighter Charger - Hands Free Kit 6. WLPST ( LGIC Product Support Tool For Win95 )
LGC-500W 2LGICLG Information & Communications, Ltd.The LGC-500W cellular phone functions as both analog cellular phone worked in AMPS (Advanced MobilePhone Service) mode and digital cellular phone worked in CDMA (Code Division Multiple Access) mode.CDMA mode applies the DSSS (Direct Sequence Spread Spectrum) technique that has been used in military.This technique enable to share one frequency channel with many users in the same specific area. As a result, thatit increases the capacity 10 times more compared with that in the analog mode (AMPS) currently used.Soft/Softer Handoff, Hard Handoff, and Dynamic RF power Control technologies are combined into this phoneto reduce the call being interrupted in a middle of talking over phone.CDMA digital cellular network consists of MSC (Mobile Switching Office), BSC (Base Station Controller), BTS(Base station Transmission System), and MS (Mobile Station). Communication between MS and BTS isdesigned to meet the specification of IS-95A (Common Air Interface). MS meets the specifications of the below : - IS-95A (Common Air Interface) : Protocol between MS and BTS - IS-96A (Vocoder) : Voice signal coding - IS-98 : Basic MS functions - IS-126 : Voice loopback - IS-99 : Short Message Service, Asynchronous Data Service, and G3 Fax ServiceLGC-500W is composed of a transceiver, a desktop charger, two Li-Ion Batteries (1650mAh), a hands-free kit,a travel charger. In digital mode, the hands-free kit is designed to operate in full duplex. General Introduction
LGC-340/345WLGICLG Information & Communications, Ltd.1. Introduction to the Cellular System1.1 Basic Concept for the Cellular SystemThe design objective of early mobile radio systems was to achieve a large coverage area by using a single, veryhigh powered transmitter with antenna mounted on the tall tower. While this approach achieved very goodcoverage, it also meant that it was impossible to reuse those same frequency throughout the system. But theincreasing demand for mobile service required the radio telephone system to achieve high capacity with limitedradio spectrum, while at the same time covering very large areas.The cellular concept was a major breakthrough in sloving the problem of spectral congestion and user capacity.The cellular concept ,which starts from the frequency reuse technique, is a system level idea which calls forreplacing a single, high power transmitter (large cell) with many low power transmitter(small cells), eachproviding coverage to only a small portion of the service area. Each base station is allocated a portion of the totalnumber of channels available to the entire system, and nearby base stations are assigned different groups ofchannels so that all the available channels are assigned to a relative small number of neighboring base stations.Neighboring base stations are assigned different groups of channels so that the interference between base stations(and the mobile users under their control) is minimized. This technique is called channel assignment stategy.In the cellular system, the channel handoff operation is inevitably needed to keep a call while a user moves onecell to another. This function not only involves identifying a new base station, but also eruires that the voice andcontrol signals be allocated to channel associated with new base station. The handoff between different swithcingsystems is called roaming. It is call state can be maintained continuously by the information exchange betweenswitching systems when the busy subscriber moves from one cellular system area to the other cellular systemarea.1.2 Multiple Access Techniques for the Cellular SystemIn cellualr systems, it is often desirable to allow the subscriber to send simultaneously infoermation to the basestation while receiving information from the base station. This is called deplexing. Duplexing is done usingfrequency or time domain rechniques. Frequency Division Duplexing(FDD) provides two distinct bands offreqeuncies for every user. In FDD, any duplex channel actually consist of two simplex channels, and a devicecalled a duplexer is used inside handsets and base stations. Time Division Duplexing(TDD) uses time instead offrequency to provide both a forward and reverse link. If the time split between the forward and reverse time slotis small, then the transmission and reception of data appears simultaneous to the user.Multiple access techniques are used to share the available channel resources(frequency bandwidth). FrequencyDivision Multiple Access(FDMA), Time Division Multiple Access(TDMA), Code Division MultipleAccess(CDMA) are the three major techniques in cellular systems. CHAPTER 1. System Introduction
LGC-340/345W 4LGICLG Information & Communications, Ltd.FDMA allocates a unique frequencys to a channel. These channels are assigned on demand to users who requestservice. During the period of the call, no other user can share the same frequency band. In FDD systems, theusers are assigned a channel as a pair of frequencies; one frequency is used for the forward channel, while theother frequency is used for the reverse channel. This system is called FDD/FDMA system. Most of analogcellular systems(AMPS, E-AMPS, NMT, ETACS, JTACS, etc. ) are FDD/FDMA system.TDMA systems devide the radio spectrum into time slots, and each slot only one user is allowed to ether transmitor receive. Each user occupies a cyclically repeating time slot, so a channel may be thought of as particular timeslot that reoccurs every frame, where N time slots comprise a frame. TDMA systems can apply in both TDD andFDD.Code Division Multiple Access (CDMA) is a radically new concept in wireless communications. It has gainedwidespread international acceptance by cellular radio system operators as an upgrade that will dramaticallyincrease both their system capacity and the service quality. It has likewise been chosen for deployment by themajority of the winners of the United States Personal Communications System spectrum auctions. It may seem,however, mysterious for those who aren't familiar with it. This site is provided in an effort to dispel some of themystery and to disseminate at least a basic level of knowledge about the technology.CDMA is a radically new concept in wireless communications. It has gained widespread international acceptanceby cellular radio system operators as an upgrade that will dramatically increase both their system capacity and theservice quality. It has likewise been chosen for deployment by the majority of the winners of the United StatesPersonal Communications System spectrum auctions. It may seem, however, mysterious for those who aren'tfamiliar with it. This site is provided in an effort to dispel some of the mystery and to disseminate at least a basiclevel of knowledge about the technology.CDMA is a form of spread-spectrum, a family of digital communication techniques that have been used inmilitary applications for many years. The core principle of spread spectrum is the use of noise-like carrier waves,and, as the name implies, bandwidths much wider than that required for simple point-to-point communication atthe same data rate. Originally there were two motivations: either to resist enemy efforts to jam thecommunications (anti-jam, or AJ), or to hide the fact that communication was even taking place, sometimescalled low probability of intercept (LPI). It has a history that goes back to the early days of World War II.The use of CDMA for civilian mobile radio applications is novel. It was proposed theoretically in the late 1940's,but the practical application in the civilian marketplace did not take place until 40 years later. Commercialapplications became possible because of two evolutionary developments. One was the availability of very lowcost, high density digital integrated circuits, which reduce the size, weight, and cost of the subscriber stations toan acceptably low level. The other was the realization that optimal multiple access communication requires thatall user stations regulate their transmitter powers to the lowest that will achieve adequate signal quality.CDMA changes the nature of the subscriber station from a predominately analog device to a predominatelydigital device. Old-fashioned radio receivers separate stations or channels by filtering in the frequency domain.CDMA receivers do not eliminate analog processing entirely, but they separate communication channels bymeans of a pseudo-random modulation that is applied and removed in the digital domain, not on the basis of
LGC-340/345W 5LGICLG Information & Communications, Ltd.frequency. Multiple users occupy the same frequency band. This universal frequency reuse is not fortuitous. Onthe contrary, it is crucial to the very high spectral efficiency that is the hallmark of CDMA. Other discussions inthese pages show why this is true.CDMA is altering the face of cellular and PCS communication by:l Dramatically improving the telephone traffic (Erlang) capacityl Dramatically improving the voice quality and eliminating the audible effects of multipath fadingl Reducing the incidence of dropped calls due to handoff failuresl Providing reliable transport mechanism for data communications, such as facsimile and internet trafficl Reducing the number of sites needed to support any given amount of trafficl Simplifying site selectionl Reducing deployment and operating costs because fewer cell sites are neededl Reducing average transmitted powerl Reducing interference to other electronic devicesl Reducing potential health risks
LGC-340/345W 6LGICLG Information & Communications, Ltd.2. Features and Advantages of CDMA Mobile Phone (For AMPS as well)2.1 Various Types of DiversitiesWhen employing the narrow band modulation (30kHz band) that is the same as the analog FM modulationsystem used in the existing cellular system, the multi-paths of radio waves create a serious fading. However, inthe CDMA broadband modulation(1.25MHz band), three types of diversities (time, frequency, and space) areused to reduce the multi-path fading problems generated from radio channels in order to obtain high-quality calls.Time diversity can be obtained through the use of code interleaving and error correction code whereas frequencydiversity can be obtained by spreading signal energy to more wider frequency band. The fading related to normalfrequency can affect the normal 200~300kHz among signal bands and accordingly, serious affect can be avoided.Moreover, space diversity (also called path diversity) can be realized with the following three types of methods.First, it can be obtained by the duplication of cell site receive antenna. Second, it can be obtained through the useof multi-signal processing device that receives a transmit signal having each different transmission delay time andthen, combines them. Third, it can be obtained through the multiple cell site connection (Soft Handoff) thatconnects the mobile station and more than two cell sites at the same time.2.2 Power ControlThe CDMA system utilizes the forward (from a base station to mobile stations) and backward (from the mobilestation to the base station) power control in order to increase the call processing capacity and obtain high-qualitycalls. In case the originating signals of mobile stations are received by the cell site in the minimum call qualitylevel (signal to interference) through the use of transmit power control on all the mobile stations, the systemcapacity can be maximized.If the signal of mobile station is received too strong, the performance of that mobile station is improved.However, because of this, the interference on other mobile stations using the same channel is increased andaccordingly, the call quality of other subscribers is reduced unless the maximum accommodation capacity isreduced.In the CDMA system, forward power control, backward open loop power control, and closed loop power controlmethods are used. The forward power control is carried out in the cell site to reduce the transmit power onmobile stations less affected by the multi-path fading and shadow phenomenon and the interference of other cellsites when the mobile station is not engaged in the call or is relatively nearer to the corresponding cell site. Thisis also used to provide additional power to mobile stations having high call error rates, located in bad receptionareas or far away from the cell site.The backward open loop power control is carried out in a corresponding mobile station; the mobile stationmeasures power received from the cell site and then, reversely increases/decreases transmit power in order tocompensate channel changes caused by the forward link path loss and terrain characteristics in relation to themobile station in the cell site. By doing so, all the mobile office transmit signals in the cells are received by thecell site in the same strength.Moreover, the backward closed loop power control used by the mobile station to control power with thecommands issued out by the cell site. The cell site receives the signal of each corresponding mobile station and
LGC-340/345W 7LGICLG Information & Communications, Ltd.compares this with the pre-set threshold value and then, issues out power increase/decrease commands to thecorresponding mobile station every 1.25 msec (800 times per second).By doing so, the gain tolerance and the different radio propagation loss on the forward/backward link arecomplemented.2.3 Voice Encoder and Variable Data SpeedThe bi-directional voice service having variable data speed provides voice communication which employs voiceencoder algorithm having power variable data rate between the mobile telephone cell site and mobile station. Onthe other hand, the transmit voice encoder performs voice sampling and then, creates encoded voice packets to besent out to the receive voice encoder, whereas the receive voice encoder demodulates the received voice packetsinto voice samples.One of the two voice encoders described in the above is selected for use depending on inputted automaticconditions and message/data; both of them utilize four-stage frames of 9600, 4800, 2400, and 1200 bits persecond. In addition, this type of variable voice encoder utilizes adaptive threshold values when selecting requireddata rate. It is adjusted in accordance with the size of background noise and the data rate is increased to high rateonly when the voice of caller is inputted.Therefore, background noise is suppressed and high-quality voice transmission is possible under the environmentexperiencing serious noise. In addition, in case the caller does not talk, data transmission rate is reduced so thatthe transmission is carried out in low energy. This will reduce the interference on other CDMA signals and as aresult, improve system performance (capacity, increased by about two times).2.4 Protecting Call ConfidentialityCDMA signals have the function of effectively protecting call confidentiality by spreading and interleaving callinformation in broad bandwidth. This makes the unauthorized use of crosstalk, search receiver, and radio veryhard substantially. Also included is the encryption function on various authentication and calls specified in IS-95for the double protection of call confidentiality.2.5 Soft HandoffThe handoff , which is basic function of the cellular system, can maintain a call when user moves one cell site toanother. In analog cellular, the cell sites use different frequecy channel, the handoff means frequence change.This mechanism also uses in CDMA. CDMA has many Frequency Allocation(FA)s. When the handoff carry outbetween different Fas, it is called Hard Handoff. The soft handoff means the handoff without change of the FA.During the soft hand, the cell site already in the busy state and the cell site to be engaged in the call laterparticipate in the call conversion. The call conversion is carried out through the original call connection cell site,both cell sites, and then, new cell site. This method do not change frquency , so minimize call disconnection andprevent the user from detecting the hand-off.
LGC-340/345W 8LGICLG Information & Communications, Ltd.2.6 Frequency Re-Use(Segmentation) and SectorizationUnlike the existing analog cellular system, the CDMA system can reuse the same frequency at the adjacent celland accordingly, there is no need to prepare a separate frequency plan. Total interference generated on mobilestation signals received from the cell site is the sum of interference generated from other mobile stations in thesame cell site and interference generated from the mobile station of adjacent cell site. That is, each mobile stationsignal generates interference in relation to the signals of all the other mobile signals.Total interference from all the adjacent cell sites is the ratio of interference from all the cell sites versus totalinterference from other mobile stations in the same cell site (about 65%). In the case of directional cell site, onecell normally uses a 120¡Æsector antenna in order to divide the sector into three. In this case, each antenna isused only for 1/3 of mobile stations in the cell site and accordingly, interference is reduced by 1/3 on the averageand the capacity that can be supported by the entire system is increased by three times.2.7 Soft CapacityThe subscriber capacity of CDMA system is flexible depending on the relation between the number of users andservice classes. For example, the system operator can increase the number of channels available for use duringthe busy hour despite the drop in call quality. This type of function requires 40% of normal call channels in thestandby mode during the handoff support, in an effort to avoid call disconnection resulting from the lack ofchannels.In addition, in the CDMA system, services and service charges are classified further into different classes so thatmore transmit power can be allocated to high class service users for easier call set-up; they can also be givenhigher priority of using hand-off function than the general users.
LGC-340/345W 9LGICLG Information & Communications, Ltd.3. Structure and Functions of CDMA Mobile Phone (For AMPS as well)The mobile station of CDMA system is made up of a radio frequency part and logic/control (digital) part. Themobile station is fully compatible with the existing analog FM system. The mobile station antenna is connectedwith the transmitter/receiver via a duplexer filter so that it can carry out the transmit/receive function at the sametime.The transmit frequency is the 25MHz band of 824~849MHz, whereas the receive frequency is the 25MHz bandof 869~894MHz. The transmit/receive frequency is separated by 45MHz. The RF signal from the antenna isconverted into intermediate frequency(IF) band by the frequency synthesizer and frequency down converter andthen, passes the bandpass SAW filter having the 1.25MHz band. IF output signals that have been filtered fromspurious signal are converted into digital signals via an analog-to-digital converters(ADC) and then, sent outrespectively to 5 correlators in each CDMA de-modulator. Of these, one is called a searcher whereas theremaining 4 are called data receiver(finger). Digitalized IF signals include a great number of call signals thathave been sent out by the adjacent cells. These signals are detected with pseudo-noise sequence (PN Sequence).Signal to interference ratio (SINAD) on signals that match the desired PN sequence are increased through thistype of correlation detection process. Then, other signals obtain processing gain by not increasing the ratio. Thecarrier wave of pilot channel from the cell site most adjacently located is demodulated in order to obtain thesequence of encoded data symbols.During the operation with one cell site, the searcher searches out multi-paths in accordance with terrain andbuilding reflections. On three data receivers, the most powerful four paths are allocated for the parallel tracingand receiving. Fading resistance can be improved a great deal by obtaining the diversity combined output for de-modulation. Moreover, the searcher can be used to determine the most powerful path from the cell sites evenduring the soft handoff during the two cell sites. Moreover, four data receivers are allocated in order to carry outthe de-modulation of these paths. Data output that has been demodulated change the data string in the combineddata row as in the case of original signals(deinterleaving), and then, are de-modulated by the forward errorcorrection decoder which uses the Viterbi algorithm.On the other hand, mobile station user information sent out from the mobile station to the cell site pass throughthe digital voice encoder via a mike. Then, they are encoded and forward errors are corrected through the use ofconvolution encoder. Then, the order of code rows is changed in accordance with a certain regulation in order toremove any errors in the interleaver. Symbols made through the above process are spread after being loaded ontoPN carrier waves. At this time, PN sequence is selected by each address designated in each call.Signals that have been code spread as above are digital modulated (QPSK) and then, power controlled at theautomatic gain control amplifier (AGC Amp). Then, they are converted into RF band by the frequencysynthesizer synchronizing these signals to proper output frequencies. Transmit signals obtained pass through theduplexer filter and then, are sent out to the cell site via the antenna.
LGC-340/345W 10LGICLG Information & Communications, Ltd.4. Specification4.1 General Specification4.1.1 Transmit/Receive Frequency Interval : 45 MHz4.1.2 Number of Channels (Channel Bandwidth)1) CDMA : 20 CH2) AMPS : 832 CH4.1.3 Operating Voltage : DC 3.6V4.1.4 Battery Power Consumption : DC 3.5VSLEEP IDLE MAX POWERCDMA 2.3 mA103 mA 740 mA (24 dBm)AMPS ¦¡99 mA 845 mA (28 dBm)4.1.5 Operating Temperature : -30° ~ +60°4.1.6 Frequency Stability1) CDMA : ¡¾0.5PPM2) AMPS : ¡¾2.5PPM4.1.7 Antenna : Retractable Type (Herical+Whip), 50 Ω4.1.8 Size and Weight1) Size : 120 5 47.3 5 27 §§ (Batt : STD )120 5 47.3 5 23.2§§ (Batt :Option)2) Weight : 140 ~150g (Batt : STD )120 ~ 130g (Batt : Option)4.1.9 Channel Spacing1) CDMA : 1.25MHz2) AMPS : 30KHz4.1.10 Battery Type, Capacity and Orerating Time. Unit = Hours : MinutesStandard(1400mA)Option(900mA)CDMA 240 Hrs 140 HrsStand-By Time AMPS 25 Hrs 15Hrs
LGC-340/345W 11LGICLG Information & Communications, Ltd.CDMA 300 Mins 180 MinsTalk Time AMPS 140 Mins 90 Mins4.2 Receive Specification4.2.1 Frequency Range1) Digital : 869.820 MHz ~ 893.190 MHz2) Analog : 869.04 MHz ~ 893.97 MHz 4.2.2 Local Oscillating Frequency Range : 966.88MHz¡¾12.5MHz4.2.3 Intermediate Frequency : 85.38MHz4.2.4 Sensitivity1) CDMA : -104dBm (C/N 12dB or more)2) AMPS : -116dBm (12dB SINAD)4.2.5 Selectivity1) CDMA : 3dB C/N Degration (With Fch¡¾1.25 kHz : -30dBm)2) AMPS : 16dB at Fch¡¾30kHz, 60 dB at Fch¡¾60kHz4.2.6 Spurious Wave Suppression : Maximum of -80dB4.2.7 CDMA Input Signal Range • Dynamic area of more than -104~ -25 dB : 79dB at the 1.23MHz band.4.2.8 AMPS DE-Emphasis : -6dB/OCT within 0.3~3kHz4.2.9 AMPS Expander1) Expansion Rate : 1:22) Attack Time : within 3mS3) Recovery Time : within 13.5mS4) Reference Input : Output level to a 1000Hz tone from a carrier within +2.9kHz peak frequency deviation.4.2.10 AMPS Sensitivity : 12dB SINAD/-116dBm4.2.11 AMPS Intermodulation Spurious Response Attenuation : Above 65dB4.2.12 AMPS RSSI Range : Above 60dB4.2.13 AMPS Protection Against Spurious Response Interference : Above 60dB
LGC-340/345W 12LGICLG Information & Communications, Ltd.4.2.14 AMPS In Band Conducted Spurious Emissions1) Transmit Band : below –60dBm2) Receive Band : below –80dBm4.2.15 AMPS Out of Band Conducted Spurious Emissions : Below -47dBm4.2.16 AMPS Radiated Spurious EmissionsFrequency Range Maximum allowable EIRP 25 ~ 70 kHz 70 ~ 130 kHz 130 ~ 174 kHz 174 ~ 260 kHz 260 ~ 470 kHz 470 ~ 1 GHz - 45 dBm - 41 dBm - 41 ~ - 32 dBm - 32 dBm - 32 ~ - 26 dBm - 21 dBm4.3 Transmit Specification4.3.1 Frequency Range1) Digital : 824.820MHz ~ 848.190MHz2) Analog : 824.04MHz ~ 848.97MHz4.3.2 Local Oscillating Frequency Range : 966.88 MHz¡¾12.5 MHz4.3.3 Intermediate Frequency : 130.38 MHz4.3.4 Output Power 1) CDMA : 0.32W 2) AMPS : 0.6W4.3.5 Interference Rejection 1) Single Tone : -30dBm at 900 kHz 2) Two Tone : -43dBm at 900 kHz & 1700kHz4.3.6 AMPS Carrier ON/OFF Conditions “ ON” condition : within +3dB of specification output (in 2mS)4.3.7 AMPS Compressor • Compression Rate : 2:1 • Attack Time : 3mS • Recovery Time : 13.5mS
LGC-340/345W 13LGICLG Information & Communications, Ltd. • Reference Input : Input level for producing a nominal +2.9kHz peak requency deviation of transmitted carrier.4.3.7 AMPS Preamphasis : 6dB/OCT within 0.3 ~ 3 kHz4.3.8 AMPS Maximum Frequency Deviation • F3 of G3 : ¡¾12kHz (¡¾10% ) • Supervisory Audio Tone : ¡¾2kHz (¡¾10% ) • Signaling Tone : ¡¾8kHz (¡¾10%) • Wideband Data : ¡¾8kHz (¡¾10 %)4.3.9 AMPS Post Deviation Limiter Filter • 3.0kHz ~ 5.9kHz : above 40LOG (F/3000) dB • 5.9kHz ~ 6.1kHz : above 35dB • 6.1kHz ~ 15kHz : above 40LOG (F/3000) dB • Over 15kHz : above 28dB4.3.10 AMPS Spectrum Noise Suppression • For all Modulation fo+20kHz ~ fo+45kHz : above 26dB • For Modulation by Voice and SAT fo+45kHz : above 63+10LOG (Py) dB • For Modulation by WBD ( without SAT ) and ST ( with SAT ) fo+45kHz ~ fo+60kHz : above 45dB fo+60kHz ~ fo+90kHz : above 65dB fo+90kHz ~ 2fo : above 63+10LOG (Py) dB (where fo=carrier frequency, Py=mean output power in watts)4.3.11 AMPS Harmonic and Conducted Spurious Emissions : above 43+10LOG (Py) dB4.3.12 CDMA TX Frequency Deviation : +300Hz or less4.3.13 CDMA TX Conducted Spurious Emissions • 900kHz : - 42 dBc/30kHz below • 1.98MHz : - 54 dBc/30kHz below4.3.14 CDMA Minimum TX Power Control : - 50dBm below
LGC-340/345W 14LGICLG Information & Communications, Ltd.4.4 MS (Mobile Station) Transmitter FrequencyFA NO. CH.NO. CENTER FREQUENCY FA NO. CH.NO. CENTER FREQUENCY1234567891010112970111152193234275316363824.640 MHz825.870 MHz827.100 MHz828.330 MHz829.560 MHz830.790 MHz832.020 MHz833.250 MHz834.480 MHz835.890 MHz11121314151617181920404445486527568609650697738779837.120 MHz838.350 MHz839.580 MHz840.810 MHz842.04 MHz843.270 MHz844.500 MHz845.910 MHz847.140 MHz848.370 MHz4.5 MS (Mobile Station) Receiver FrequencyFA NO. CH.NO. CENTER FREQUENCY FA NO. CH.NO. CENTER FREQUENCY1234567891010112970111152193234275316363869.640 MHz870.870 MHz872.100 MHz873.330 MHz874.560 MHz875.790 MHz877.020 MHz878.250 MHz879.480 MHz880.890 MHz11121314151617181920404445486527568609650697738779882.120 MHz883.350 MHz884.580 MHz885.810 MHz887.04 MHz888.270 MHz889.500 MHz890.910 MHz892.140 MHz893.370 MHz4.6 Desktop Charger : See Appendix4.7 Travel Charger : See Appendix4.8 Cigar Lighter Charger : See Appendix4.9 Hands-Free Kit : See Appendix
LGC-340/345W 15LGICLG Information & Communications, Ltd.5. Installation5.1 Installing a Battery Pack1) The Battery pack is keyed so it can only fit one way. Align the groove in the battery pack with the rail on theback of the phone until the battery pack rests flush with the back of the phone.2) Slide the battery pack forward until you hear a “click”, which locks the battery in place.5.2 For Desktop Charger Use1) Plug the charger into a wall outlet. The charger can be operated from either a 110V or a 220V source. WhenAC power is connected to the desktop charger, both the green and red LED’s blink once.2) Insert the phone with the installed battery pack or a spare battery pack into the individual battery pack slot.Red light indicates battery is being charged.. Green light indicates battry is fully charged.5.3 For Mobile Mount5.3.1 Installation PositionIn order to reduce echo sound when using the Hands-Free Kit, make sure that the speaker and microphone are notfacing each other and keep microphone a generous distance from the speaker.5.3.2 Cradle Installation Choose an appropriate flat surface where the unit will not interface with driver’s movement or passenger’scomfort. The driver/user should be able to access the phone with ease. Using the four self-tapping screwsprovided, mount the supplied braket on the selected area. Then with the four machine screws provided, mount thecounterpart on the reverse side of the reverse side of the cradle. Secure the two brackets firmly together by usingthe two bracket joint screws provide. The distance between the cradle and the interface box must not exceed thelength of the main cable.5.3.3 Interface BoxChoose an appropriate flat surface ( somewhere under the dash on the passenger side is preferred ) and mount theIB bracket with the four self-tapping screws provided. Clip the IB into the IB bracket.5.3.4. Microphone InstallationInstall the microphone either by cliiping I onto the sunvisor (driver’s side) or by attaching it to door post(driver’s side), using a velcno adhesive tape (not included).
LGC-340/345W 16LGICLG Information & Communications, Ltd.5.3.5 Cable Connections5.3.5.1 Power and Ignition CablesConnect the red wire to the car battery positive terminal and the black wire to the car ground. Connect the greenwire to the car ignition sensor terminal. ( In order to operate HFK please make sure to connect green wire toignition sensor terminal.) Connect the kit’s power cable connector to the interface box power receptacle.5.3.5.2 Antenna Cable ConnectionConnect the antenna coupler cable connector from the cradle to the external antenna connector. ( Antenna is notincluded.)
LGC-340/345W 17LGICLG Information & Communications, Ltd.1. Telephone Number and NAM Programming Method • Press MENU+4+0 and then, press the password made up of six digits(Default:000000). Then, the following Menu is appeared. • Press 1 to program the telephone number and NAM. • Select one NAM (the registration requires NAM1 as default). • Edit ESN(if you want, but not recommended) , then press [OK]. • Enter the phone number, then press [OK]. • Edit NAM 1 HOME SID, then press [OK]. CHAPTER 2. NAM Input Method (Inputting of telephone numbers included)1 : NAM 12 : NAM 23 : NAM 34 : NAM 41 : Prog Mode2 : Pref. Mode3 : ER Mode4 : PRLESNNAM 1 PHONENUMBERNAM 1 HOME SID
LGC-340/345W 18LGICLG Information & Communications, Ltd. • Edit the name of NAM1, the press [OK]. ‘NAM 1 NAME’ may display the name of the service provider. • Now, the basic programming is completed. To reset the handset, press [EXIT]. If you want to program detail informtions for NAM 1, press [MORE].The detail programming method is same as basic programming. Set up required values and then, press the [OK]soft key in an effort to move to the next screen. To return to the last item, press the left arrow (3*). The editableNAM items are followed:SERVICE SEC. CODENAM 1 LOCK_OUT SYSTEM 1NAM 1 CDMA PHONE MUNBERNAM 1 MOBILE COUNTRY CODENAM 1 MOBILE NETWORK CODENAM 1 MOBILE STATION ID #NAM 1 CDMA HOME SID 1NAM 1 CDMA HOME NID 1NAM 1 CDMA HOME SID 2NAM 1 CDMA HOME NID 2NAM 1 CDMA HOME SID 3NAM 1 CDMA HOME NID 3NAM 1 CDMA HOME SID 4NAM 1 CDMA HOME NID 4NAM 1 AMPS PHONE NUMBERNAM 1 AMPS HOME SIDPHONE MODELSLOT CYCLE INDEX¡Ø Editing this items is not recommended.NAM 1 NAMEBASIC NAM 1PROGRAMMINGIS COMPLETED
LGC-340/345W 19LGICLG Information & Communications, Ltd.1. RF Transmit/Receive Part1.1 OverviewThe RF transmit/receive part employs the Super-Heterodyne system. The transmit/receive frequency isrespectively 824.04~848.97 MHz and 869.04~893.97 MHz and the block diagram is shown in Appendix 4.RF signals received through the antenna are fed into the low noise amplifier (LNA) through the duplexer. Then,they are combined with the signals of local oscillator (VCO) at the frequency mixer in order to createintermediate frequency (IF).Intermediate frequency created is sent out to each bandpass filter (BPF) through the FM (Analog) or CDMA(Digital) path and then, fed into IFR (RX IF BASEBAND converter), signals are auto gain controlled and, arechanged into baseband signals.These signals are then, changed into digital signals by the analog/digital converter (ADC, A/D Converter) andthen, sent to the MSM (Mobile Station Modem) of the digital circuit part. Then, they are demodulated by themodulator/demodulator.In the case of transmission, IFT receives modulated digital signals from the MSM of the digital circuit and then,changes them into analog signals by the digital/analog converter (DAC, D/A Converter) in order to createbaseband signals. Created baseband signals are changed into IF signals by IFT and then, are auto gain controlled.IF signals that have been fed are mixed with the signals of VCO and changed into the RF signals and amplifiedwith dynamic range.They are amplified at the Power AMP. Finally, they are sent out to the cell site via the antenna after goingthrough the isolator and duplexer.Block Diagram of RFLocal circuitPowerAMPUpmixerDriveAMPLNADownMixerIFAMPDuplexerSAWFilterTX RFSAWFilterRX RFSAWFilterPLLVCO VC -TcxoRF IFTXTankIFT3000RXTank IFR3000CDMA IFSAW FilterDFM IFSAW Filter19.68M Hz19.68M HzPA_ON TX_AGC_ADJLNA_Range SYNTH_LOCKIsolator[Figure 1-1] Block Diagram of RF Transmit/Receive Part CHAPTER 3. Circuit Description
LGC-340/345W 20LGICLG Information & Communications, Ltd.1.2 Description of Receive Part Circuit1.2.1 DuplexerThe duplexer(DP1) consists of the receive part bandpass filter (BPF) and the transmit part bandpass filter (BPF)which have the function of separating transmit/receive signals in the full duplex system using the transmit/receivecommon antenna. The transmit part BPF is used to suppress noises and spurious waves entering the receive bandamong transmit signals in order to prevent the drop in receive sensitivity characteristics. The receive part BPFblocks the signals sent out from entering the receive end in order to improve sensitivity characteristics.Insertion loss (IL) in the transmit band is 2.4dB (Max), whereas IL in the receive band is 3.3dB (Max).The receive band attenuation amount of transmit filter is 58dB (Min) and the transmit band attenuation amount ofreceive filter is 43dB or more (Min).1.2.2 DownconverterThe downconverter is made up largely of low noise amplifiers(U2) and a frequency active gain DOWNmixer(U14).RF signals (869.04 ~ 893.97 MHz) received from the Duplexer are amplified after obtaining the gain of 19dBthrough the LNA. Then, they are passed through the BPF. At this time, about 3dB IL is generated.The output signals are fed to the mixer input terminal(U14.4). The mixer synchronizes the RF signals with localoscillating signal that has been inputted to the local input terminal(U14.3) in order to create the IF (85.38MHz)signals. At this time, the conversion gain of 10dB is added the signals.Local oscillating signals through other paths are fed into the mixer of transmit terminal.The signal suppression rate of RF signal band on local oscillating signals is 40dB on th average whereas the IFsignal band signal suppression rate is 33 dB.IF signals have two paths after passing the Mixer. One is the digital path (CDMA) while the other is the analogpath (FM).The paths to be selected are determined by receiving output signals FM/ of MSM3000 through the IF selectterminal. IF signals that have selected the FM path are inputed to FM IF BPF(F8) for FM through the FM path.IF signals that have selected the CDMA path are passed CDMA IF saw filter(F6) and then, are inputed toIFR3000.
LGC-340/345W 21LGICLG Information & Communications, Ltd.1.2.3 Receive End Bandpass FilterReceive RF signals (869.04-893.97 MHz) from the LNA are fed into RF BPF. RX RF filter has IL of 3dB(Max) on the average whereas the ripple of passband is about 2.0dB (Max) and the RF signal suppression rate ontransmit band is 30dB.The impedance of input/output terminal is 50Ω and the maximum power that can be inputted is about 25dBm. IFBPF for CDMA signals (85.38MHz¡¾630kHz) can receive the IF signal of 20dBm which is the maximum inputsignal from the Down mixer. The side band signal suppression rate is 41dB and IL is 10.3dB.IF BPF for FM has the 3dB bandwidth of 85.38MHz¡¾15kHz. IL is 5dB (Max) whereas the ripple of passband is1.5dB (Max).1.2.4 Description of IFR3000 Internal CircuitThe IFR3000 is a key circuit element in the Rx signal path of the CDMA/AMPS subscriber unit. It is locatedbetween RF system and the MSM digital processor. The analog inputs of IFR3000 interface directly with the IFreceive circuitry of the subscriber unit. The digital inputs and outputs of IFR3000 interface directly withMSM3000.1.2.4.1 CDMA Rx Signal PathThe IFR3000 consists of a received signal path, clock synthesis, buffering circuits and mode control logic.The CDMA Rx signal path comprises the Rx AGC amplifier, mixer, CDMA low-pass filters, and A/D converters.With its CDMA_IF and CDMA_IF/ terminals, the IFR3000 receives two IF signals that have been modulated(CDMA Spreading Power Density Modulation) extending ± 630kHz from 85.38MHz Center Frequency.The Rx AGC amplifiers or attenuates the received CDMA IF signal to provide a constant-amplitude signal to theI/Q downconverter.This type of gain control is the power adjustment function to reduce the loss resulting from the receive power of amobile station by maintaining the constant signal strength at the IFR3000 receive end even if the received signalschange according to the location of a mobile station user.The AGC gain is controlled by varying the DC voltage on the Vcontrol input pin.The AGC’s 90dB dynamic range is available over the full power supply range of the device. The IF output of theRx AGC amplifier is further classified into I and Q signals and downconverted by mixing with quadrature localoscillator signals. The local oscillator signals are generated by a voltage controlled oscillator onboard theIFR3000 and frequency stabilized by external varactor-tuned resonant tank circuitry. The I and Q phasing of thereceive section is spectrally inverted from a standard quadrature demodulator when the IF input signal frequencyis above the IF center frequency. The I/Q down converter outputs the CDMA I and Q signals haing thebandwidth of 1kHz ~630kHz through CDMA LPF. The use of LPF in IFR3000 suppresses spurious signalsentering the receiver in order to improve the CDMA baseband signal selectivity.
LGC-340/345W 22LGICLG Information & Communications, Ltd.CDMA analog I and Q baseband components are converted to digital signals by 2 4-bit ADCs.The ADCs outputa new 4-bit parallel digital value on each rising edge of the ADCs synchronous clock input signal,CHIP×8.The CHIP×8 ADC clock frequency of 9.8304 MHz is developed in the IFR3000 by multiplying the 19.68MHzsystem crystal oscillator frequency by 512/1025.At the 2 4 bit ADCs, Q_OFFSET and I_OFFSET signals are inputted to MSM3000.These signals are very important during the digital signal processing process of receive signal paths andaccordingly, the adjustment should be made in such a way that the MSM3000 detects the difference from ADCdigital output RXID[3:0] and RXQD[3:0] and then, generates PDM (Pulse Density Modulation) signals forcompensating the variation. This PDM signal passes the single-pole RC LPF and then, is converted into DVvoltage before being inputted to the I-OFFSET and Q-OFFSET terminals of the IFR3000.1.2.4.2 FM Rx Signal PathThe Fm received signal Path is designed to accept a differential IF signal with frequency modulation extending±15kHz from the IF center frequency to form a 30Hz wide IF channel. The IF center frequency is same as theCDMA IF center frequency, 85.38MHz.The RX AGC amplifier interface with the IF subsystem of the subscriber unit. The Rx AGC either amplifiers orattenuates the received FM IF signal to provide a constant amplitude.Constant amplitude signals go through the I/Q downconverter.The AGC amplifier conditions the received IF signal to optimize between low IF output power level and highsignal intellegibility and reliability. The AGC gain is controlled by varing a DC voltage on the Vcontrol input pin.The AGC’s 90dB dynamic range is availiable over the full power supply range of the device.The IF output of the Rx AGC amplifier is separated into I-Channel and Q-channel baseband compoments anddownconverted by mixing with quadrature local oscilliator signals.The I and Q phasing of the receive section is spectrally inverted form a standard quadrature demodulator whenthe IF input signal frequency is above the IF center frequency.The I/Q down converter outputs the FM signals at baseband frequency. Low pass filtering enables the receiver toselect the desired baseband signal from the jamming effects of unwanted noise or adjacent-channel interference.FM analog I and Q baseband components are converted to digital FM(DFM) signals by two 8-bit ADCs. The FMADCs’ outputs are inputted into MSM3000 through RXIFMDATA and RXQFMDATA terminals.
LGC-340/345W 23LGICLG Information & Communications, Ltd.1.3 Transmit Part Circuit Description1.3.1 Description on the Internal Circuit of IFT30001.3.1.1 CDMA Tx Signal Path8 bits I and Q transmit signals are inputted into 2 DACs (Digtal to Analog Converter) from the output terminalTX_IQDATA[7:0] of the MSM 3000 through the input terminals TXD[7:0] of the IFT3000.In the signals coming out of the DACs, there are spurious frequency ingredients resulting from DAC outputtransition edge and parasite ingredients, transmit clock frequencies and harmonics which are unwanted signals.Accordingly, spurious ingredients are removed by passing the signals through LPF of passband 630kHz.Unlike the receive end, the transmit end LPF requires no OFFSET adjustment.The IFT3000 includes a programmable Tx PLL for synthesizing the TxIF frequency.The TxVCO oscillates at twice the TxIF frequency. The 260.76MHz created in the IFT3000’s internal VCO aredivided by half into frequency 130.38MHz having the phase difference of 90 degrees.Analog I and Q baseband components are mixed in quadrature with the Tx IF frequency and added again togenerate a modulated waveform centered at 130.38MHz IF frequency.A temperature-compensated Tx AGC amplifier with 84dB gain range is included in the IFT3000. The transmitoutput power level of the subscriber unit is directly controlled by varying the gain of this Tx AGC amplifier.APDM output from the MSM3000 ‘s TX_AGC_ADJ pin is RC low-pass filtered and turned to a DC voltage level.This voltage level linearly controls the gain of the Tx AGC amplifier.1.3.1.2 FM Tx Signal PathOnce 8 bits digital transmit signals are transferred to IFT3000 from MSM3000.They are inputted into LPF through DAC for Q signal, which is one of two DACs.During this time, all the paths for the spread spectrum algorithm do not operate and accordingly, powerconsumption can be reduced. FM transmit signals that pass through LPF are outputted after being changed intothe FM modulation signal FM_MODE of band 30KHz.The use of Tx AGC is same as the CDMA Tx signal path.1.3.2 Upconverter and Drive AMPUpconverter(U13) is made up of a mixer part and a amplifier part. The mixer part is used to receive double-balanced OUT+ and OUT- of IFT3000 and mixes the output of Dual PLL Module with UHF output signal.Upconverter’s output operation range is 800MHz~960MHz (RF frequency) and has the conversion gain of 5 dB.In addition, the suppression of spurious signals which are unwanted noise(885kHz offset) is about -50 dBc when
LGC-340/345W 24LGICLG Information & Communications, Ltd.being compared to RF output.Amplifier part is consisted on RF AMP that has linear Gian control on 26dB, is controlled by TX_AGC_ADJfrom MSM.Between Upconverter and Drive Amp , there is a band pass filter(F3).1.3.3 Transmit End Bandpass FilterTransmit signals that have been converted from IF signals into RF signals after passing through the upconverterare inputted into the Power Amp, after passing once again through RF BPF in order to filter out noise signalsamplified.This is carried out in order to create power level inputted to the Power AMP via RF BPF . IL of two RF BPFs is3.5dB (Max) as a maximum, whereas the ripple in the passing band is 2dB(Max). The degree of the suppressionof transmit signals on receive band is at least 25dB or greater. The maximum power that can be inputted is about10dBm.1.3.6 Power Amplifier and IsolatorThe power amplifier(P1) that can be used in the CDMA and FM mode has linear amplification capability,whereas in the FM mode, it has a high efficiency.For higher efficiency, it is made up of one MMIC (Monolithic Microwave Integrated Circuit) for which RF inputterminal and internal interface circuit are integrated onto one IC after going through the AlGaAs/GaAs HBT(heterojunction bipolar transistor) process.The module of power amplifier is made up of an output end interface circuit including this MMIC.The maximum power that can be inputted through the input terminal is +7dBm and conversion gain is about30dB.RF transmit signals that have been amplified through the power amplifier are sent to the duplexer viaisolator(ISO1) and then, sent out to the cell site through the antenna in order to prevent any damages on circuits,that may be generated by output signals reflected from the duplexer and re-inputted to the power amplifier outputend. The maximum power of that can be inputted is 5W (Max) and IL is 0.65dB (Max). Input/output separationis at least 15dB (Min).
LGC-340/345W 25LGICLG Information & Communications, Ltd.1.4 Description of Frequency Synthesizer Circuit1.4.1 Voltage Control Temperature Compensation Crystal OscillatorThe temperature range that can be compensated by VC-TCXO(X3) which is the reference frequency generator ofa mobile station is -30~+80 °C.VC-TCXO receives frequency tuning signals called TRK_LO_ADJ from MSM as 0.5V~2.5V DC via R and Cfilters in order to generate the reference frequency of 19.68MHz and input it into the frequency synthesizer ofUHF band. Frequency stability depending on temperature is ¡¾2.0 ppm.1.4.2 Dual PLL ModuleReference frequency that can be inputted to PLL(U8) is 19.68MHz.It is the dual mode frequency synthesizer (PLL) that can synthesize frequencies band 954MHz~980MHz and IFoscilation frequency 170.76MHz. PLL that receives the reference frequency of 19.68MHz from VC-TCXOcreates the phase detect frequency of 30kHz with the use of internal program and then, changes the frequency of900MHz band. And then, two signal differences are calculated from the internal phase comparator.The calculated difference is inputted to DC for adjusting the frequency of PLL. In addition, outputs of otherPIN3 are inputted into IFR after going through the VRACTOR diode and tank circuit so that the outputs of IFRinternal receive end VCO are adjusted to 170.76MHz.PLL that generates the LO frequency of a mobile station have good spurious characteristics (ref. supurious at30kHz from carrier = -70dBc (Max)).
LGC-340/345W 26LGICLG Information & Communications, Ltd.2. Digital/Voice Processing Part2.1 OverviewThe digital/voice processing part processes the user's commands and processes all the digital and voice signalprocessing in order to operate in the phone. The digital/voice processing part is made up of a keypad/LCD,receptacle part, voice processing part, mobile station modem part, memory part, and power supply part.2.2 Configuration2.2.1 Keypad/LCD and Receptacle PartThis is used to transmit keypad signals to MSM3000. It is made up of a keypad backlight part that illuminates thekeypad, LCD part that displays the operation status onto the screen, and a receptacle that receives and sends outvoice and data with external sources.2.2.2 Voice Processing PartThe voice processing part is made up of an audio codec used to convert MIC signals into digital voice signalsand digital voice signals into analog voice signals,amplifying parts for amplifying the voice signals and MIC signals are on Codec.2.2.3 MSM3000 (Mobile Station Modem) PartMSM3000 is the core elements of a CDMA mobile station and carries out the functions of CPU, encoder,interleaver, deinterleaver, Viterbi decoder, Mod/Demod, and vocoder.2.2.4 Memory PartThe memory part is made up of a flash memory, a SRAM, and an EEPROM.2.2.5 Power Supply PartThe power supply part is made up of 5 Regulators and direct connet to Batt.Regulator(150mA )s give the power each Circuits(TX chain, RX chain, IFT and ITR, Codec).Regulator(200mA) gives the power MSM and memory .PAM, Motor, LED is directly conneted to Batt.
LGC-340/345W 27LGICLG Information & Communications, Ltd.2.3 Circuit Description[Figure 2-1] Block Diagram of Digital/Voice Processing Part2.3.1 Keypad/LCD and Receptacle PartOnce the keypad is pressed, the key signals are sent out to MSM3000(U16) for processing. In addition, when thekey is pressed, the keypad lights up through the use of 16 LEDs. The status and operation of a mobile station aredisplayed on the screen for the user with the characters and icons on the LCD.Receptacle(CON3) exchanges audio signals and data with external sources and then, receives power from thebattery or external batteries.2.3.2 Audio Processing PartMIC signals are inputted into the audio codec, and amplified with programmable gain(2dB step), and convertedinto digital signals(PCM). Then, they are inputted into MSM3000.In addition, digital audio signals(PCM) outputted from MSM3000 are converted into analog signals after goingthrough the audio codec. These signals are amplified with programmable gain on codec’s internal AMP andtransferred to the ear piece. Then, the signals of ringer activate the ringer is generated in MSM3000 and drive theringer circuit(Q10, Q11).AT53BV164Digital PartMSM 3000memoryFlash ROMEEPROMCODECKey PadReceptacleLCDMICBuzzerEarPiecePower3.0 v3.0 v
LGC-340/345W 28LGICLG Information & Communications, Ltd.2.3.3 MSM PartMSM3000 is the core element of a CDMA mobile station. Subsystems within the MSM3000 include a CDMAprocessor,a QCELP(qualcomm Code Excited Linear Predication) vocoder,an EVRC(Enhanced Variable RateCodec) vocoder, an ARM7TDMI microprocessor ,and assorted peripheral interfaces that are used to supportother functions. MSM3000, when operated in the CDMA mode, utilizes CHIP×8 (9.8304MHz) received from theIFR3000 as the reference clock primarily for CDMA and vocoder processing.MSM3000 also uses TCXO/4(4.92MHz) received from IFR3000.The CPU controls total operations of the subscriber unit. Digital voice data, that have been inputted, are encodedusing the QCELP algorithm. Then, they are convolutionally encoded so that error detection and correction arepossible. Coded symbols are interleaved in order to avoid a burst error. Each data channel is scrambled by thelong code PN sequence of the user in order to ensure the confidentiality of calls.Moreover, binary quadrature codes are used based on Walsh functions in order to discern each channel. Datacreated thus are 4-phase modulated by one pair of Pilot PN code and they are used to create I and Q data.When received, I and Q data are demodulated into symbols by the demodulator and then, de-interleaved inreverse to the case of transmission. Then, the errors of data received from Viterbi decoder are detected andcorrected. They are voice decoded at the vocoder in order to output digital voice data.The MSM3000 also supports Enhanced Variable Rate Coder (EVRC) operation in addition to the standard 8kand 13k vocoding rating.2.3.4 Memory PartThe memory part consists of a 16Mbits Flash Memory, a 4Mbits SRAM(Static Random Access Memory), and a256kbits EEPROM(Electrically Erasable and Programmable Read Only Memory). In the Flash Memory, thereare programs used for the operation of a mobile station. The programs can be changed through down loadingafter the assembling of mobile stations. On the SRAM, data generated during the operation of a mobile stationare stored temporarily. On the EEPROM, the non-volatile data of the mobile station such as a ESN(ElectronicSerial Number) are stored.2.3.5 Power Supply Partturn ONWhen the battery voltage (4.2V ~ 3.0V) is fed and the PWR key of keypad is pressed, Q8 is activated by the+VPWR and ON_SW signal and then, ON/ is generated. Based on this ON/, regurator U3 is operated and+3.0V_MSM is generated.operatingDuring the phone is on operating state,LDO for MSM is always enable and gives the power MSM and memory partLDO for IFT_IFR are always enable and gives the power IFT, IFR and VC-TCXO.
LGC-340/345W 29LGICLG Information & Communications, Ltd.LDO for TX part is enable on IDLE state, and gives the power TX part devices. But PAM is given the powerdirectly from Batt.LDO for RX part is enable on SLEEP state, and gives the power RX part devices and PLL block.LDO for audio part is enable on audio enable state, and gives the power Codec.Turn OFFWhen the PWR key is pressed during a few seconds, Q8(DTC144EE) is turned on by ON_SW and then, 'Low' isoutputted on ON_SW_S/. MSM3000 receives this signal and then, recognizes that the POWER key has beenpressed. During this time, MSM3000 outputs PS_HOLD as low and turn off all devices2.3.6 Logic PartThe Logic part consists of internal CPU of MSM3000, RAM, ROM and EEPROM.The MSM3000 receives TCXO/4 clock(19.68Mz) and CHIPX8 clock signals from the IFR3000, and thencontrols the phone during the CDMA and the FM mode. The major components are as follows: CPU : ARM7TDMI core MEMORY : • FLASH Memory : 16M bits • STATIC RAM : 4M bits • EEPROM : 265kbitsCPUARM7TDMI 32-bit microprocessor is used and CPU controls all the circuitry. Some of the features of theARM microprocessor include a 3 stage pipelined RISC architecture, both 32-bit ARM and 16bit THUMBinstruction setsm, a 32-bit address bus, and a 32-bit internal data bus.FLASH MemoryFlash Memory is used to store the program of the mobile station. Using the down-loading program, theprogram can be changed even after the mobile station is fully assembled.SRAMSRAM is used to store the internal flag information, call processing data, and timer data.KEYPADFor key recognition, key matrix is setup using key sense0-4 signals and GPIO0-4 of output ports of MSM.Backlight circuitry are included in the keypad for easy operation in the dark.LCD MODULELCD module contains a controller which will display the information onto the LCD by 8-bit data from theMSM.It has a black and white full graphic 112(W) ¥¹ 64(H) dots

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