LG KP107 Service Manual

Service Manual

Model : KP107

Service Manual

KP107

Date: September, 2009 / Issue 1.0

Internal Use Only

- 3 -

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 Modul(SKY77518) .......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

4. TROUBLE SHOOTING ...................42

4.1 RF Trouble .............................................42

4.2 TX Trouble .............................................48

4.3 Power On Trouble..................................52

4.4 SIM Card Trouble...................................54

4.5 Vibrator Trouble .....................................56

4.6 Keypad Trouble......................................58

4.7 RTC Trouble ..........................................60

4.8 Key backlight Trouble ............................62

4.9 LCD Trouble...........................................64

4.10 Microphone Trouble .............................67

4.11 Receiver Trouble..................................69

4.12 Speaker Trouble ..................................71

4.13 Headphone Trouble .............................73

4.14 Charging Trouble .................................75

5. DOWNLOAD.......................................77

5.1 Download Setup.....................................77

5.2 Download Process .................................78

6. BLOCK DIAGRAM ..........................83

7. Circuit Diagram ..............................85

8. BGA IC PIN Check..........................89

9. PCB LAYOUT..................................91

10. ENGINEERING MODE ..................93

10.1 About Engineering Mode .....................93

10.2 Access Codes ......................................93

10.3 Key Operation ......................................93

10.4 Engineering Mode Menu Tree .............93

11. CALIBRATION.............................102

11.1 Test Equipment Setup .......................102

11.2 Calibration Steps................................102

12. STAND ALONE TEST .................107

12.1 Test Program Setting .........................107

12.2 Tx Test ...............................................109

12.3 RX Test ..............................................110

13. EXPLODED VIEW &

REPLACEMENT PART LIST...... 111

13.1 Exploded View .................................. 111

13.2 Replacement Parts ............................113

13.3 Accessory ......................................... 122

Table Of Contents

LGE Internal Use Only

- 4 -

LGE Internal Use Only

Only for training and service purposes

- 5 -

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

- 6 -

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

- 7 -

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 101 * 46 * 12.9mm

Weight 65g

Battery 900mAh Li-ion

Talk Time

Up to 6.5 hrs @GSM900, TX Level : 10

Battery performance may vary depending on network and phone usage

Stand-by Time

Up to 630 hrs @Paging period : 9

Battery performance may vary depending on network and phone usage

RTC Under 1 minute when removed battery.

Antenna Internal Type(Dual-band)

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

KEY Back Light Yes

KEY Back Light color Blue

Vibrator Yes

Speaker&Receiver Yes(18x10 Dual Mode)

C-MIC Yes

Earphone Jack Mono or Stereo(Optional)

SIM Yes(Plug in Type) : 1.8V & 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

- 8 -

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 20

Last Received Number O 20

Last Missed Number O 20

Scratch Pad Memory X

Call Call Waiting O

Manage-ment Call Swap O

Call Retrieve O

Auto Answer X

Automatic Redial O

Calling Line identification O

Full Call divert O

Speed Dialing O

Last Number Redial O

Multi-party Call (Conference Call)

O

Explicit Call Transfer X

2. PERFORMANCE

- 9 -

LGE Internal Use Only

Only for training and service purposes

2. PERFORMANCE

- 10 -

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, Home

Numeric Store and Recall O

Alphabetic Store O

Alphabetic Recall O

Scroll by alphabetic or O

numeric order

Last Number Dialed

O20

Last Number Missed O 20

Last Number Received O 20

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

- 11 -

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 5 calls

SIM Plug?In Type O 1.8V & 3 V

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 O

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

- 12 -

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 O ringtone, wallpaper 1EA Download

Scheduler Sync X E-MAIL, EMS, Schedule, Phonebook,

Name card etc.

Sync ML DS X

DM X

Game O Sudoku support

Menu Quick Access Mode (Profile) X

External Interface Electrical Man Machine Interface O

Development and Test Facility O

LGE Internal Use Only

2. PERFORMANCE

- 13 -

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 Luxury Package 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

1

#0*

987

654

32

E-GOLDvoice

µC C166 @ 26MHz

TEAKlite @ 78MHz

Internal SRAM: 1.75Mbit

Integr. PMU (Direct-to-Battery:

10LDO, Charging, White LED

B&W

Display

SIM Card

6x4 and 5x5

Handsfree, 16Ohm/350mW

Poly-Ringer

I2C, SSC

Direct SIM

Interface

RTC Back-up

Flash

Connectors

Earpiece

TX module

(PA+ASM)

Charger

Battery LiIon/NiMH

Vibrator

Backlight

RAM

SAW

Mic

900/1800

- 15 -

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 -40°C to 85°C. It is manufactured using the 0.13 µm CMOS process.

LGE Internal Use Only

Only for training and service purposes

3. TECHNICAL BRIEF

- 16 -

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 µs)

• Integrated loop filter

• RF Oscillator

• Fully integrated RF VCO.

] Crystal Oscillator

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

- 17 -

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

- 18 -

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

- 20 -

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 Modul(SKY77518)

The SKY77518 is a transmit and receive front_end module(FEM) with integrated Power Amplifier Control for dual_band cellular handsets comprising GSM900 and DCS 1800 Operation. Designed in a low profile, compact form factor, the SKY77518 offers a complete transmit VCO-to Antenna and Antenna-to-Receive SAW filter solution.

The module consists of a GSM900 PA block and a DCS1800 PA block, impedancematching circuitry for 50ohm input and output impedances, Tx harmonics filtering, high linearity and low insertion loss PHEMT RF switches, diplexer and a Power Amplifier Control (PAC) block with internal current sense resistor. A custom BiCMOS integrated circuit provides the internal PAC function and decoder circuitry to control the RF switches. The two Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated onto a single Gallium Arsenide (GaAS) die.

3. TECHNICAL BRIEF

- 22 -

Figure. 3-2 SKY77518 FUNCTIONAL BLOCK DIAGRAM

LGE Internal Use Only

3. TECHNICAL BRIEF

- 23 -

One PA block supports the GSM900 band and the other PA block supports the DCS1800 band. Both PA blocks share common power supply pads to distribute current.

The output of each PA block and the outputs to the two receive pads are connected to the antenna pad through PHEMT RF switches and a diplexer. The GaAs ddie, PHEMT die, Silicon (Si)die and passive components are mounted on a multi-layer laminate substrate. The assembly is encapsulated with plastic overmold.

Band Selection and control of transmit and receive modes are performed using two external control pads. Refer to the functional block diagram in Figure 3-2. The Band select pad (BS) selects between GSM and DCS modes of peration. The transmit enable (TX_EN) pad controls receive or transmit mode of the respective RF switch (TX = logic 1). Proper timing between transmit enable (TX_EN) and Analog Power Control (VRAMP) allows for high isolation between the antenna and TX-VCO while the VCO is being tuned prior to the transmit burst.

The SKY77518 is compatible with logic levels from 1.2V to VCC tor BS and TX_EN pads, depending on the level applied to the VLOGIC pad. This feature provides additional flexibility for the designer in the selection of FEM interface control logic.

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

- 24 -

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

C131

18p

OSC32K

F32K

R5 B4

X102

MC-146_12_5PF

12

3

4

32.768KHz

C132

18p

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

(ENQY0013801)

IMSA-9671S-13Y902

27p

C122

47R107

C126

NA

R111 47

R110 47

C125

27p

C124

NA

EVL5M02200

VA102

NA

R113

R112 47

2

3

4

5

6

7

8

9

CN101

14 15

1

10

11

12

13

C121

NA

2V8_VIO

C123

27p

VA101

EVLC5S0250

_LCD_CS

SSC0_MTSR

MLED1

MLED2

LCD_ID

MLED

LCD_RESET

SSC0_CLK

Figure 3-5-2. Charge pump interface

CHARGE PUMP

1u

C106

U101

C1+

10

9

C1-

7

C2+

6

C2-

CP

8

1

D1 D2

2 3

D3

EN_SET

11

GND

4

5

IN

NC

12

AAT3157ITP-T1

C101

1u

100K

R104

C103

NA1u

C102

C109

NA

C104

1u

C108

NA

VBAT

W_LED_DRV

MLED1 MLED2

MLED

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

_LCD_CS 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

SIM_CONNECTOR

0.1u

C134

22p

C133

2V85_VSIM

4.7K

R129

R130

0

2V85_VSIM

J101

3

CLK

GND

4

7

GND1GND2

8

6

I_O

RST

2

VCC

1

5

VPP

C135

22p

2V85_VSIM

SIM_DATA SIM_CLK

SIM_RST

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

5

RIGHT

2

LEFT

#

8

SEL

MENU

KEY MATRIX

END

9

4

0

UP

3

DOWN

*

6

SEND

7

1

SW305

2V0_VRTC

SW304

SW317

SW307

SW302 SW306

SW308

SW318

SW316

SW303

SW315SW312

SW319 SW320

SW313

SW301

SW309 SW311

SW310

SW314

KEY_IN3

KEY_OUT1

KEY_IN4

END_KEY

KEY_IN0

KEY_IN1

KEY_IN2

KEY_OUT4

KEY_OUT3

KEY_OUT2

LGE Internal Use Only

Only for training and service purposes

3.8 Battery Charging Block Interface

The MP26021 is a linear, high-performance single cell Li-Ion battery charger. By integrating high voltage input protection into the charger IC, the MP26021 can Tolerate an input surge up to 28V

The device features constant current (CC) and constant voltage (CV) charging modes with programmable charge currents(85mA to 1A), programmable battery full threshold, thermal protection, battery temperature monitoring, reverse current blocking and trickle charge. The device also provides AC adapter power good and Charge status indications to the system.

MP26021 is available in a 10-pin 3mm x 3mm QFN package.

3. TECHNICAL BRIEF

- 30 -

Figure 3-8. Charging IC Interface

(1%)

(85mA)

(25V,K,Y5V)

(2012)

(1%)

(400mA)

(1608)

CHARGING IC

C129

2.2u

620

R123

47R121

R119

470K

VCHARGE

3.9K

R128

4.7u

C128

VBAT

U102 MP26021

10

BATT

6

GND

IBF

8

1

IN

9

ISET

5

NTC

PGND

11

SS

7

3

_ACOK

_CHG

2

_EN

4

1.8KR120

R125

100K

20K

R127

R126

100K

0.1u

C130

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 3-9-2. RF Module /SAW Filter interface

7

GSM_RX

NC

18

21

PGND

TX_EN

4

1

VBATT

VLOGIC

2

3

VRAMP

PCS_IN

19

6

PCS_RX

17

11

ANT

5

BS

GND1

8 9

GND2

10

GND3

GND4

12

13

GND5

GND6

14

15

GND7

GND8

16

GND9

20

GSM_IN

IN CASE OF GSM850/PCS1900

TO PART_NO SFSB0001301

PART_NO SFSB0001401

CHANGE THIS DUAL SAW FILTER

5.1nH

L405

1K R405

39p

C409

39p

C411

2G13G25G310

G4

I1

1

I2

4

9

O1_1

O1_2

8

O2_1

7

O2_2

6

B9310FL401

C414 3p

3pC416

SKY77517

U401

L404 18nH

C408

39p

3pC413

C415 3p

C410

39p

VLOGIC

DCS_PCS_OUT

GSM_OUT

GSM_RXN

GSM_RXP

DCS_RXN

DCS_RXP

BS

TXON_PA

TX_RAMP

LG KP107 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual