LG KG271, KG276 Service Manual

Date: June, 2007 / Issue 1.0

Service Manual

Internal Use Only

Service Manual

KG271/KG276

Model : KG271/KG276

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1. INTRODUCTION ...............................5

1.1 Purpose .................................................. 5

1.2 Regulatory Information............................ 5

2. PERFORMANCE...............................7

2.1 H/W Features...........................................7

2.2 S/W Features...........................................8

3. TECHNICAL BRIEF ........................14

3.1 Digital Main Processor(PMB7880).........14

3.2 Power Amplifier Module (SKY77318) ....22

3.3 26 MHz Clock (DCXO)...........................24

3.4 RTC(32.768KHz Crystal) .......................25

3.5 LCD Interface(3-wire SPI interface).......26

3.6 SIM Card Interface.................................28

3.7 KEYPAD Interface .................................29

3.8 Battery Charging Block Interface ...........30

3.9 RF Interface ...........................................31

3.10 Audio Interface.....................................33

3.11 Key LED Interface................................37

3.12 Vibrator Interface .................................38

3.13 Memory Interface.................................39

3.14 Power Block Interface..........................40

3.15 FM Radio Interface ..............................42

4. TROUBLE SHOOTING ...................44

4.1 RF Trouble.............................................44

4.2 TX Trouble .............................................50

4.3 Power On Trouble..................................54

4.4 SIM Card Trouble...................................56

4.5 Vibrator Trouble .....................................58

4.6 Keypad Trouble......................................60

4.7 RTC Trouble ..........................................62

4.8. Key backlight Trouble ...........................64

4.9. LCD Trouble..........................................66

4.10. Microphone Trouble............................69

4.11. Receiver Trouble.................................71

4.12 Speaker Trouble ..................................73

4.13 Headphone Trouble .............................75

4.14 Charging Trouble .................................77

4.15 FM Radio Trouble ................................79

5. DOWNLOAD.......................................82

5.1 Download Setup.....................................82

5.2 Download Process.................................83

6. BLOCK DIAGRAM ..........................88

7. Circuit Diagram ..............................89

8. PCB LAYOUT..................................93

9. ENGINEERING MODE ....................95

9.1 About Engineering Mode .......................95

9.2 Access Codes........................................95

9.3 Key Operation........................................95

9.4 Engineering Mode Menu Tree ...............95

10. CALIBRATION ..............................92

10.1 Test Equipment Setup .........................92

10.2 Calibration Steps..................................92

11. STAND ALONE TEST .................109

11.1 Test Program Setting.........................109

11.2 Tx Test...............................................111

11.3 RX Test..............................................112

12. EXPLODED VIEW &

REPLACEMENT PART LIST ..... 113

12.1 Exploded View .................................. 113

12.2 Replacement Parts ............................115

12.3 Accessory ......................................... 125

Table Of Contents

LGE Internal Use Only

- 4 -

LGE Internal Use Only

Only for training and service purposes

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1. INTRODUCTION

1.1 Purpose

This manual provides the information necessary to repair, description and download the features of this model.

1.2 Regulatory Information

A. Security

Toll fraud, the unauthorized use of telecommunications system by an unauthorized part (for example, persons other than your company’s employees, agents, subcontractors, or person working on your company’s behalf) can result in substantial additional charges for your telecommunications services. System users are responsible for the security of own system. There are may be risks of toll fraud associated with your telecommunications system. System users are responsible for programming and configuring the equipment to prevent unauthorized use. The manufacturer does not warrant that this product is immune from the above case but will prevent unauthorized use of common-carrier telecommunication service of facilities accessed through or connected to it. The manufacturer will not be responsible for any charges that result from such unauthorized use.

B. Incidence of Harm

If a telephone company determines that the equipment provided to customer is faulty and possibly causing harm or interruption in service to the telephone network, it should disconnect telephone service until repair can be done. A telephone company may temporarily disconnect service as long as repair is not done.

C. Changes in Service

A local telephone company may make changes in its communications facilities or procedure. If these changes could reasonably be expected to affect the use of the this phone or compatibility with the network, the telephone company is required to give advanced written notice to the user, allowing the user to take appropriate steps to maintain telephone service.

D. Maintenance Limitations

Maintenance limitations on this model must be performed only by the manufacturer or its authorized agent. The user may not make any changes and/or repairs expect as specifically noted in this manual. Therefore, note that unauthorized alternations or repair may affect the regulatory status of the system and may void any remaining warranty.

1. INTRODUCTION

LGE Internal Use Only

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1. INTRODUCTION

E. Notice of Radiated Emissions

This model complies with rules regarding radiation and radio frequency emission as defined by local regulatory agencies. In accordance with these agencies, you may be required to provide information such as the following to the end user.

F. Pictures

The pictures in this manual are for illustrative purposes only; your actual hardware may look slightly different.

G. Interference and Attenuation

Phone may interfere with sensitive laboratory equipment, medical equipment, etc.Interference from unsuppressed engines or electric motors may cause problems.

H. Electrostatic Sensitive Devices

ATTENTION

Boards, which contain Electrostatic Sensitive Device (ESD), are indicated by the sign. Following information is ESD handling:

• Service personnel should ground themselves by using a wrist strap when exchange system boards.

• When repairs are made to a system board, they should spread the floor with anti-static mat which is also grounded.

• Use a suitable, grounded soldering iron.

• Keep sensitive parts in these protective packages until these are used.

• When returning system boards or parts like EEPROM to the factory, use the protective package as described.

LGE Internal Use Only

Only for training and service purposes

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2. PERFORMANCE

2.1 H/W Features

2. PERFORMANCE

LGE Internal Use Only

Item Specifications

Band GSM DUAL Band(900/1800)

Type Bar type

Dimension 98 * 45 * 12.9mm

Weight 60g

Battery 750mAh Li-ion

Talk Time Over 2hours @EGSM,TX Level : 5

Stand-by Time Over 200 hours @Paging period : 5

RTC Under 4 hours when removed battery.

Antenna Internal Type(Dual-band)

LCD(Main) 1.52"(128x128 pixels), 65K Color STN LCD

Back Light Yes

Back Light color Blue

Vibrator Yes

Speaker&Receiver Yes(11x07 Receiver, 16®™ Speaker)

C-MIC Yes

Earphone Jack Mono or Stereo(Optional)

SIM Yes(Plug in Type) : 3.0V

MIDI 16 poly

I/O Connect 18 Pins (included Earphone Jack)

LGE Internal Use Only

Only for training and service purposes

2.2 S/W Features

Function Detail Item Specification Etc.

Operating System OS O OSE

Data Circuit O

Packet X

Connectivity Infrared (IrDA) X

Bluetooth X

USB X

USB Mass storage X

RS232 O

Voice Function Voice Recording X

Voice Command X

Answering machine X

Memory User Memory O TBD Under 300KB

X MMS

X

Pictures (Still Image &

Moving Image)

X MP3 (Music Contents)

X Java Contents

O Wallpaper 3 bitmap images

O Ringtone 10 MIDI Ringtones

X external memory (microSD)

Camera Camera Module X

Audio Voice Codec O FR, HR, EFR, AMR-NB

AMR O

FM Radio O

Integrated handsfree speaker O Speaker phone mode

2. PERFORMANCE

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LGE Internal Use Only

Function Detail Item Specification Etc.

Display RSSI O 6 level

Battery Level O 5 level

RTC O

Multi?Language O Basic:English

Max. 4 language of Latin

2 or 3 language of etc.

Quick Access Mode X

PLMN/Service Indicator O

Dimming Clock X

Dual Clock X

Local Time / Selected Area Time

Normal Features Last Dialed Number O 10

Last Received Number O 10

Last Missed Number O 10

Scratch Pad Memory X

Call Call Waiting O

Manage-ment Call Swap O

Call Retrieve O

Auto Answer X

Automatic Redial O

Calling Line dentification O

Full Call divert O

Speed Dialing O

Last Number Redial O

Multi-party Call (Conference Call)

O

Explicit Call Transfer X

2. PERFORMANCE

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LGE Internal Use Only

Only for training and service purposes

2. PERFORMANCE

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Function Detail Item Specification Etc.

Network Automatic Network Selection O

Manual Network Selection O

Network Service Status O

DTMF DTMF Signaling O

DTMF Enable & Disable O

Audio Key Tone Volume O 6 Level (Include Mute)

Ring Tone Volume O 6 Level (Include Mute)

Ring Tone Pattern O 10Type(fixed)

Ring Type Silent O Vibrator & Ring (Indicator)

Earpiece Volume O

6 Level (Include Mute)

Mute O

Cell Broadcast Read Cell Broadcast O

Cell Broadcast Categories O

Cell Broadcast Message O

Language

Phone Book Entry O 300

Field O Office,Mobile

Numeric Store and Recall O

Alphabetic Store O

Alphabetic Recall O

Scroll by alphabetic or O

numeric order

Last Number Dialed

O10

Last Number Missed O 10

Last Number Received O 10

Copy & Move O

Fixed Dial Number O

Barred Dial Number X

Service Dial Number O

Email Entry X

Picture ID X

Video Caller ID X

My Name card X

LGE Internal Use Only

2. PERFORMANCE

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Function Detail Item Specification Etc.

Supp. Services Call Forwarding O All Incoming Calls,

O No Reply O On Busy, O Not reachable

Call Barring O All Outgoing Calls,

O International Calls,

O

Calls except to Home Country incoming Calls,

O

All incoming Calls when roaming

Conference Call O up to 3 calls

SIM Plug?In Type O 3 V only

SIM Lock O Service Provider / Network Lock SIM Toolkit O Class 1, 2, 3 Prepaid SIM Operation O

Mega SIM X Short Messaging Read Message O Manage-ment Write and Edit Message O Not Support EMS

Send and Receive Message O

Reply to Message O

Forward Message

Extract Number from Message O

Message Status O

Message Unread Indicator O

Settable Message Center Number,

O Reply Path and Validity O Visible and Audible Message

O Receive Alerting

Voice Mail O Settable Voice Mail Center Number

O Message Protocol

O

Normal, Fax, National Paging,

Email, X400, ERMES, Voice Message Overflow Indicator O Message Center Number O Help Menu X

LGE Internal Use Only

Only for training and service purposes

2. PERFORMANCE

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Function Detail Item Specification Etc.

Sound contents Ringtones O

Karaoke X Stutter Sound X Flip tone X Button tone O

Others X Miscellaneous Development & Test Facility O Function Field Test Facility O

Display Software Version O

IMEI O Text Input Language O Selectable Auto Language

Predictive word input O T9 Scheduler Schedule O 20 input (20 character)

To Do List X 50 input

Memo O 20 input (40 character)

D-day counter X

Send via Bluetooth X Schedule, Memo, To Do list, Messaging World Time Setting Local Time O

Display Two Number of Cities Time X

Dual clock Daylight saving X Summer time calibration function NITS X Automatic setting as country code in SIM

Unit converter O Currency, Surface, Length, Weight,

Temperature, Volume, Velocity

Stop watch O Calculator Calculation O + - * / PC Sync Phone Book Sync X

Message Sync X Multimedia Contents Sync X Scheduler Sync X E-MAIL, EMS, Schedule, Phonebook,

Name card etc.

Sync ML DS X

DM X

Game X Menu Quick Access Mode (Profile) X External Interface Electrical Man Machine Interface O

Development and Test Facility O

LGE Internal Use Only

2. PERFORMANCE

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Function Detail Item Specification Etc.

Handset Restore Factory Setting O

Read Software Version O Battery Charging Mode O

Security Emergency Call O

Handset Lock O Security Code O Delete all SIM Lock O Key guard O

Real Time Clock 12/24 hour O

Calendar O

Automatic Leap Year Adjustment Time Zone O Daylight saving X Alarm Manager O Once, Daily, Mon~Fri, Mon~Sat Dimming Clock X Power-off Alarm O On Alarm Event O Display

Accessory Hand strap X

Embedded microSD Card X microSD Adapter X Stereo earmic O EarMic Type Provides optionally

only for supporting

FM radio function. earmic w/music remote controller X Neck strap X LCD Cleaner X Holster X Data cable O RS232 cable Option CD X Holster charger X Standard battery Back-up

and Holster function additional standard battery X Extended Battery X Desktop Charger X Cigar Lighter Adapter X Portable Handsfree X Bluetooth headset X Bluetooth stereo earset controller X Car kit X Leather Pouch X Stylus Pen X

X

Compass X

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3. TECHNICAL BRIEF

3.1 Digital Main Processor(PMB7880)

3. TECHNICAL BRIEF

LGE Internal Use Only

Only for training and service purposes

Figure. 3-1 PMB7880 FUNCTIONAL BLOCK DIAGRAM

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3. TECHNICAL BRIEF

3.1.1 Overview of E-GOLDvoice

The E-GOLDvoice is a GSM baseband modem including RF transceiver covering the low bands GSM850 /GSM900 and high bands GSM1800 / GSM1900 bands. E-GOLDvoice is Dual Band, therefore, it supports by default a low / high pair of bands at the same time:

1. GSM850 / GSM1800

2. GSM850 / GSM1900

3. GSM900 / GSM1800

4. GSM900 / GSM1900 The E-GOLDvoice is optimized for voice-centric Mobile Phone applications. The E-GOLDvoice is designed as a single chip solution that integrates the digital, mixed-signal, RF functionality and a direct-to-battery Power Management Unit.

The transceiver consists of:

• Constant gain direct conversion receiver with an analog I/Q baseband interface

• Fully integrated Sigma/Delta-synthesizer capability

• Fully integrated two-band RF oscillator

• Two-band digital GMSK modulator with digital TX interface

• Digitally controlled crystal oscillator generating system clocks.

The E-GOLDvoice supports a direct battery connection, hence eliminating the need for an external Power Management Unit. The E-GOLDvoice has different power down modes and an integrated power up sequencer.

The E-GOLDvoice is powered by the C166®S MCU and TEAKLite® DSP cores. The operating temperature range from -40C to 85C. It is manufactured using the 0.13 •Ïm CMOS process.

LGE Internal Use Only

Only for training and service purposes

3. TECHNICAL BRIEF

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3.1.2 Features

] Baseband

• High performance fixed-point TEAKlite DSP

• C166S high performance microcontroller

• There are several Interfaces:

- I2S interface for DAI connections (for Tape Approval)

- High Speed SSC Interface for connection of external peripherals

- SIM Interface

- Keypad Interface (6x4 or 5x5 keys)

- EBU for external RAM/FLASH connection

- Asynchronous serial interface

- JTAG Interface

- Black & white and color displays are supported

- PWM source to drive vibrator

- Keypad and display backlight supported.

] Receiver

• Constant gain, direct conversion receiver with fully integrated blocking filter

• Two integrated LNAs

• No need of interstage and IF filter

• Highly linear RF quadrature demodulator

• Programmable DC output level

• Very low power budget.

] Transmitter

• Digital Sigma-Delta modulator for GMSK modulation, typical -163.5 dBc/Hz@20 MHz

• Single ended outputs to PA, Pout = +3.5 dBm

• Very low power budget.

] RF-Synthesizer

• Σ∆Synthesizer for multi-slot operation

• Fast lock-in times (< 150 •Ïs)

• Integrated loop filter

• RF Oscillator

• Fully integrated RF VCO.

] Crystal Oscillator

• Fully digital controlled crystal oscillator core with a highly linear tuning characteristic.

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3. TECHNICAL BRIEF

] Mixed Signal and Power Management Unit

• DC/DC boost for voltages up to 15V for driving White or Blue LEDs

• 8-Ohm loud speaker driver (250/350mW)

• 16-Ohm earpiece driver

• 32-Ohm headset driver

• 4 measurement interfaces (PA temperature, battery voltage, battery temperature,and ambient temperature)

• Differential microphone input

• System start up circuitry

• Charger circuitry for NiCd, NiMh and LiIon cells

• Integrated regulators for direct connection to battery.

LGE Internal Use Only

Only for training and service purposes

3.1.3 GSM System Description

The E-GOLDvoice is suited for mobile stations operating in the GSM850/900/1800/1900 bands. In the receiver path the antenna input signal is converted to the baseband, filtered, and then amplified to target level by the RF transceiver chipset. Two A-to-D converters generate two 6.5 Mbit/s data streams. The decimation and narrowband channel filtering is done by a digital baseband filter in each path.

The DSP performs:

1. The GMSK equalization of the received baseband signal (SAIC support available)

2. Viterbi channel decoding supported by an hardware accelerator.

The recovered digital speech data is fed into the speech decoder. The E-GOLDvoice supports fullrate, halfrate, enhanced fullrate and adaptive multirate speech CODEC algorithms. The generated voice signal passes through a digital voiceband filter. The resulting 4 Mbit/s data stream is D-to-A converted by a multi-bit-oversampling converter, postfiltered, and then amplified by a programmable gain stage. The output buffer can drive a handset ear-piece or an external audio amplifier, an additional output driver for external loud speaker is implemented. In the transmit direction the differential microphone signal is fed into a programmable gain amplifier. The prefiltered and A-to-D converted voice signal forms a 2 Mbit/s data stream. The oversampled voice signal passes a digital decimation filter. The E-GOLDvoice performs speech and channel encoding (including voice activity detection (VAD) and discontinuous transmission (DTX)) and digital GMSK modulation. In the RF transceiver part, the baseband signal modulates the RF carrier at the desired frequency in the 850 MHz, 900 MHz, 1.8 GHz, and 1.9 GHz bands using an I/Q modulator. The E-GOLDvoice supports dual band applications. Finally, an RF power module amplifies the RF transmit signal at the required power level. Using software, the E-GOLDvoice controls the gain of the power amplifier by predefined ramping curves (16 words, 11 bits). For baseband operation, the E-GOLDvoice supports:

• Making or receiving a voice call

• Sending or receiving an SMS.

3. TECHNICAL BRIEF

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LGE Internal Use Only

3. TECHNICAL BRIEF

- 19 -

3.1.4 PMU Details

The E-GOLDvoice includes battery charger support (various sensor connections for temperature, battery technology, voltage, etc.) and a ringer buffer. E-GOLDvoice avoids the need for an external power management component because its internal power management unit contains:

• Voltage regulators for the On-chip and Off-chip functional blocks

• Charger circuitry for NiCd, NiMh and LiIon cells.

3.1.5 Bus Concept

The E-GOLDvoice has two cores (a microcontroller and a DSP), each with its own bus. There is an interconnection between the TEAKlite bus and the C166S X-Bus.

3.1.6 C166S Buses

The C166S is connected to three buses:

1. Local Memory (LM) bus

2. X-Bus

3. PD-Bus.

3.1.7 TEAKLite Bus

The TEAKlite is connected to the TEAKlite bus.

3.1.8 Bus Interconnections

The interconnection between the X-Bus and the TEAKlite Bus uses:

• Multicore Synchronization

• Shared Memory.

3.1.9 Clock Concept

The E-GOLDvoice has a flexible clock control.

3.1.10 Interrupt Concept

The C166 MCU carries out the E-GOLDvoice interrupt system.

3.1.11 Debug Concept

The E-GOLDvoice includes a multi-core debug. The C166 and TEAKlite cores can be debugged in parallel with:

• A single JTAG port (that is, on a single host)

• Mutual breakpoint control.

LGE Internal Use Only

Only for training and service purposes

3.1.12 C166 Debug Concept

The debugging of the C166 uses the OCDS and the Cerberus.

3.1.13 TEAKLite Debug Concept

TEAKlite debugging uses the OCEM and the SEIB.

3.1.14 Power Management

The E-GOLDvoice provides the power management unit (PMU) for the complete mobile phone application. The integrated PMU is directly connected to the battery and provides a set of linear voltage regulators (LDO’s). These LDO’s generate all required supply voltages and currents needed in a low feature mobile phone. A charger control circuit charges NiCd, NiMH and LiIon batteries. The charger control supports hardware controlled pre-charging and software controlled charging. It offers a wide charger voltage range, making halfwave/full-wave charging with cheap transformers possible. White/blue backlight generation is supported with a special driver for very a low external parts count. Power consumption during operation phases is minimized due to flexible clock switching In the Standby Mode most parts of the device are switched off, only a small part is running at 32kHz and the controller RAM is switched to a power saving mode. The TEAKLite ROM can be switched off during Standby via SW.

3.1.15 On-Chip Security Concept

Secure boot is based on a public/private key approach. Flash images that are not signed with the private key during phone manufacture cannot be loaded. Verification of the Flash code is done with the public key. The public key as well as hash and verify algorithms are stored in the ROM, which ensures a hardware secured boot procedure.

The following security features are supported:

• Prevention of illegal Flash programming

• Flash programming makes use of the E-GOLDvoice ID for personalization checks with IMEI and SIM-lock protection

3. TECHNICAL BRIEF

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LGE Internal Use Only

3. TECHNICAL BRIEF

- 21 -

The security features use the following mechanism:

• Boot ROM flow:

- Controls the boot transition to external flash

- Controls the flash update

• Flash tied to the individual chip via an ID using e-fuses, that is, each E-GOLDvoice chip has its own fused ID.

Further details on the E-GOLDvoice security concept are not publicly documented.

3.1.16 Asynchronous Operation Mode Concept

The E-GOLDvoice can operate in either:

• The traditional synchronous mode with the 26MHz system clock synchronized on the base station

• A special asynchronous mode (XO concept).

In the asynchronous mode the 26MHz clock input is not synchronized with the base station; the residual frequency offset is compensated in the digital signal processing domain. This processing includes frequency and timing compensation of the baseband and voiceband signals.

LGE Internal Use Only

Only for training and service purposes

3.2 Power Amplifier Module (SKY77318)

The SKY77318 Power Amplifier Module (PAM) is designed in a low profile (1.2 mm), compact form factor for quad-band cellular handsets comprising GSM850/900, DCS1800, and PCS1900 operation. The PAM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation.

The module consists of separate GSM PA and DCS1800/PCS1900 PA blocks, impedance-matching circuitry for 50 Ω input and output impedances and a Power Amplifier Control (PAC) block with an internal current-sense resistor. The custom BiCMOS integrated circuit provides the internal PAC function and interface circuitry. Fabricated onto a single Gallium Arsenide (GaAs) die, one Heterojunction Bipolar Transistor (HBT) PA block supports the GSM bands and the other supports the DCS1800 and PCS1900 bands. Both PA blocks share common power supply pins to distribute current.

The GaAs die, the Silicon (Si) die, and the passive components are mounted on a multi-layer laminate substrate. The assembly is encapsulated with plastic overmold.

3. TECHNICAL BRIEF

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Figure. 3-2 SKY77318 FUNCTIONAL BLOCK DIAGRAM

LGE Internal Use Only

3. TECHNICAL BRIEF

- 23 -

RF input and output ports of the SKY77318 are internally matched to a 50 Ω load to reduce the number of external components for a quad-band design. Extremely low leakage current (2.5 µA, typical) of the dual PA module maximizes handset standby time. The SKY77318 also contains bandselect switching circuitry to select GSM (logic 0) or DCS/PCS (logic 1) as determined from the Band Select (BS) signal.

In Figure 1 below, the BS pin selects the PA output (DCS/PCS_OUT orGSM_OUT) and the Analog Power Control (VAPC) controls the level of output power.

The VBATT pin connects to an internal current-sense resistor and interfaces to an integrated power amplifier control (iPAC) function, which is insensitive to variations in temperature, power supply, process, and input power. The ENABLE input allows initial turn-on of PAM circuitry to minimize battery drain.

LGE Internal Use Only

Only for training and service purposes

3.3 26 MHz Clock (DCXO)

DCXO (Digitally Controlled Crystal Oscillator) and VCTCXO (Voltage Controlled Temperature Compensated Crystal Oscillator) are two different techniques used To maintain the mobile’s reference oscillator’s accuracy over time. The reference oscillator’s accuracy over time will vary due to initial crystal frequency offset, temperature drift and aging. These static and dynamic frequency variations have to be compensated, otherwise the mobile would be in danger of losing connection to the network. The technique used to perform the frequency compensation is generally termed Automatic Frequency Control (AFC). To summarize the operation of DCXO, GSM Baseband processor will calculate the AFC compensation (which is continuously updated) required based on the measured frequency error. Then the required AFC compensation is sent to the LUXO (Lineari-Zation Unit of Crystal Oscillator), which in turns control the DCXO core and generates The 26MHz system clock.

3. TECHNICAL BRIEF

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Figure. 3-3 E-GoldVoice DCXO Overview

LGE Internal Use Only

3.4 RTC(32.768KHz Crystal)

The integrated Real Time Clock (RTC) is able to provide programmable alarm functions and external interrupts. Due to its extreme low power consumption the RTC can be supplied from a small backup battery. This allows the generation of external interrupts, even when the main PMB7880 supply voltage is switched off. For this purpose the RTC is powered by own voltage supply pins VDD_RTC and VSS_RTC. The RTC shall be driven by a 32.768 kHz (32k) clock which needs to be applied via the PMB7880 F32K and OSC32K pins. The clock can be fed from either an external clock source or use the on chip 32 KHz oscillator module. The low clock frequency and the optimized low power design give the possibility to run the chip with a minimum of power dissipation. For example, for this specific application the 26 MHz reference oscillator can be switched off during system standby and a lowpower time reference can be kept when the 32k clock is provided to the RTC. The RTC consists of an PMB7880 specific RTC shell, containing the RTC macro, as well as the 32 kHz oscillator, as described in the following sections. The module RTC Shell solely performs level translation of the 32KHz clock to the VDD_LD1 power supply domain, and is not functionally associated with the RTC.

3. TECHNICAL BRIEF

- 25 -

Figure. 3-4 E-Gold Voice RTC Interface

32.768KHZ CRYSTAL

X100

MC-146_12_5PF

12

3

4

32.768KHz

C104 18p

C105 18p

32KIN

32KOUT

LGE Internal Use Only

Only for training and service purposes

3.5 LCD Interface(3-wire SPI interface)

3. TECHNICAL BRIEF

- 26 -

Figure 3-5-1. LCD Interface

IMSA-9671S-13Y902

(ENQY0013801)

47R208

NA

C213

27p

C210

47R206

C209 27p

1u

C221

27p

C211

R205 47

NA

C214

47R207

2V8_VIO

14 15

1

10

11

12

13

2

3

4

5

6

7

8

9

CN200

NA

C208

MTPG

MTPD

R210 100K

C212

27p

MLED2

MLED1

SSC0_CLK

SSC0_MTSR

CS3

LCD_RESET

MLED

LCD_ID

Figure 3-5-2. Charge pump interface

CHARGE PUMP

C204 27p

4

GND

IN

5

12

NC

AAT3157ITP-T1

10

C1+

C1-

9

C2+

7

C2-

6

8

CP

D1

1 2

D2 D3

3

11

EN_SET

U200

C200

1u

R202 100K

27p

C203

1u

C201

C202 27p

VBAT

MLED

W_LED_DRV

MLED1 MLED2

LGE Internal Use Only

The AAT3157 is a low noise, constant frequency charge pump DC/DC converter that uses a trimode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency for white LED applications. The AAT3157 is capable of driving up to three channels of LEDs at 20mA per channel from a 2.7V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN and VOUT) make this part ideally suited for small, battery-powered applications. AnalogicTech's S2Cwire™ (Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED with 16 settings down to 50µA. The low-current mode supply current can be as low as 50µA to save power.

3. TECHNICAL BRIEF

- 27 -

Figure 3-5-3. Charge pump Output Current

Signals Description

CS3 This signal enable to access to the driver IC of LCD.

SSC0_MTSR This signal transfer serial data to driver IC.

SSC0_CLK This signal transfer serial clock to driver IC.

LCD_RESET This signal makes driver IC to HW default status.

MLED This signal provide power to white LEDs.

MLED1/2 This signal be feed back from white LEDs.

2V8_VIO This signal provides power to LCD modules.(2.8V)

Data Output (mA/Ch) Data Output (mA/Ch)

1 20.0 9 5.0

2 17.0 10 4.2

3 14.0 11 3.4

4 12.0 12 2.8

5 10.0 13 1.0

6 8.6 14 0.5

7 7.0 15 0.1

8 6.0 16 0.05

LGE Internal Use Only

Only for training and service purposes

3.6 SIM Card Interface

The EGoldVoice provides SIM Interface Module. The AD6527 checks status Periodically During established call mode whether SIM card is inserted or not, but it doesn't check during deep sleep mode. In order to communicate with SIM card, 3 signals SIM_DATA, SIM_CLK, SIM_RST.

3. TECHNICAL BRIEF

- 28 -

Figure 3-6. SIM CARD Interface

C311

0.1u

4.7KR302

C310 22p

22p

C312

2V85_VSIM

0

R303

I_O

6

2

RST

1

VCC

VPP

5

J300

CLK

3

4

GND

GND1

78

GND2

2V85_VSIM

SIM_CLK

SIM_RST

SIM_DATA

Signals Description

SIM_RST This signal makes SIM card to HW default status.

SIM_CLK This signal is transferred to SIM card.

SIM_DATA This signal is interface datum.

LGE Internal Use Only

3.7 KEYPAD Interface

The keypad interface is connected to the X-Bus, together with the XBIU and the Shared Memory Register, using a single Bus Interface.

The keypad supports two scan modes:

• By default, the keypad is a 4x6 scan matrix (4 input and 6 output pins).

• To set the keypad to a 5x5 scan matrix (5 input and 5 output pins)

The scan mode should be determined at the very beginning of the system start because changes are not allowed later.

3. TECHNICAL BRIEF

- 29 -

Figure 3-7 KEY MAXTRIX Interface

DOWN

23

5

#

MENU

SEND

4

UP

SEL

KEY MATRIX

1

7

*

LEFT

END

9

0

RIGHT

6

8

SW203

R204

680

SW201

2V0_VRTC

SW216

C215

NA NA

C219

R212 680

SW205

SW212

SW217

SW215

C207

NA

SW210

SW214

NA

C218

SW211

SW200

SW219

R215 680

SW204

NA NA

C216 C220

R209

680

SW208SW207

R201

680

SW202

C206

NA

R211 680

SW209

SW213

NA

C205

680

R203

R214 680

R213 680

SW218

NA

C217

SW206

KEY_OUT2

KEY_OUT3

KEY_OUT4

KEY_IN3

END_KEY

KEY_IN0

KEY_IN2

KEY_IN1

KEY_IN4

KEY_OUT1

LGE Internal Use Only

Only for training and service purposes

3.8 Battery Charging Block Interface

The AAT3681A is a high performance battery charger designed to charge single Cell lithiumion/polymer batteries with up to 500mA of current from an external power source. It is a stand-alone charging solution, with just one external component required For complete functionality. The AAT3681A precisely regulates battery charge voltage and current for 4.2V lithiumion/polymer battery cells.

The adapter/USB charge input constant current level can be programmed up to 500mA for rapid charging applications.

The AAT3681A has four basic modes for the battery charge cycle: pre-conditioning/trickle charge; constant current/fast charge; constant voltage; and end of charge.

3. TECHNICAL BRIEF

- 30 -

Figure 3-8. Charging IC Interface

(10V,K,X5R)

CHARGING IC

(1%)

(10V,K,X5R)

1u

C126

2V8_VIO

VCHARGE

NA

R120

NA

R118

1.8KR119

0.015u

C127

160K

R124

VBAT

1u

C125

NAR123

R125

100K

R121

NA

2

_FAULT

_STATUS

3

6

ENGND

5

8

IREF

11

PGND

TIME

47

V2P8

10

VBATVIN

1

VSEN_TEMP

9

U101

ISL9201IRZ-T

0R122

C128

1u

VCHARGE

CHG_EN_TEST

CHG_STATUS

CHG_EN

CHARGE_DETECT

LGE Internal Use Only

3.9 RF Interface

E-GOLDvoice features a fully integrated constant-gain direct conversion receiver, i.e. there is no interstage filter needed and the baseband level at the analogue IQinterface follows directly the RF input level. Depending on the baseband ADC dynamic range, single- or multiple-step gain switching schemes are possible. An integrated, selfaligning, low-pass filter ensures the receivers to function under blocking and reference interference conditions and avoids aliasing by baseband sampling. An automatic DC-offset compensation is implemented and can be switched depending on the gain setting.

3. TECHNICAL BRIEF

- 31 -

Figure 3-9-1. ASM interface

Figure 3-9-2. SAW Filter interface

C417

27p

C418

27p

FL400

5

GND1 GND2

8

GND3

10

GSM1800_1900RX

6

1

GSM1800_1900TX

GSM850_900RX

4

2

GSM850_900TX

9

IN

VC_GSM1800_1900TX

7

3

VC_GSM850_900TX

LMSP2PAA-575TEMP

VC2

VC1

IN CASE OF GSM850/PCS1900

CHANGE THIS DUAL SAW FILTER

PART_NO SFSB0001401

TO PART_NO SFSB0001301

3pC421

L403 18nH

1

I2

4

9

O1_1

O1_2

8

O2_1

7

6

O2_2

B9308FL401

2

G13G25G310G4

I1

3pC419

3pC422

L404

5.1nH

3pC420

GSM_RXN

DCS_RXN

GSM_RXP

DCS_RXP