Samsung SPH-A940 Bedienungsanleitung

SPH-A940

CDMA TELEPHONE

CDMA TELEPHONE CONTENTS

1. General Introduction

2. Circuit Description

3. Installation

4. NAM Programming

5. Product Support Tools

6. Test Procedure

7. Flow Chart of Troubleshooting

8. Exploded Views and Parts List

9. Block Diagram

10. Electrical Parts List

11. PCB Diagrams

Samsung Electronics Co.,Ltd. November. 2005

Printed in Korea.

Code No.: GH68-08774A

BASIC.

ⓒ

This Service Manual is a property of Samsung Electronics Co.,Ltd.

Any unauthorized use of Manual can be punished under applicable

International and/or domestic law.

SAMSUNG Proprietary-Contents may change without notice

1. General Introduction

1-1

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1-1. General Instruction

The SPH-A940 enables mobile users to communicate 3G CDMA2000 1X service into a single handset.

For CDMA/PCS mode, The SPH-A940 supports Release A of the CDMA2000 1X standard.

The SPH-A940 is the first 2 mega pixel camera phone with 2x optical zoom and auto focus of Samsung

for North America that works on North American CDMA networks.

This stylish clamshell phone supports dual color displays, Bluetooth, MMS, voice dialing, airplane mode

and EV-DO services.

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General Introduction

1-2

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2. Circuit Description

2-1

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2-1. Logic Section

2-1-1. Power Supply

Press "END" key to turn on the phone and then the VBATT and ON_SW signals will be connected. This

turns on the inner regulators(V_MSMCORE, V_MSMC, VPD, VPA) of U203(MAX1526).

The VBATT applied to ON_SW will change ON_SW_SENSE signal from HIGH to LOW.

MSM6500(U101) sends out PS_HOLD(logical HIGH) to keep the inner regulators on even after the "END"

key is released. V_RFRX can be turned on/off by the RX_CTRL signal. V_TCXO can be turned on/off

by the TCXO_CTRL signal. The other regulators(2.85VDD, V_SYNTH, V_RFTX, V_MOTOR, V_LED) will

be in the ON/OFF state by I2C-compatible2wireserialinterface.

The regulated Voltage(U203, V_MSMCORE) are used in the core of MSM.

The regulated Voltage(U203, V_MSMC) are used in the digital part of MSM.

The regulated Voltage(U203, VPD) are used in the digital part MSM.

The regulated Voltage(U203, VPA) is used in the analog part of MSM.

The regulated Voltage(U203, V_RFTX) is used in the Tx RF part.

The regulated Voltage(U203, V_RFRX) is used in the Rx RF part.

The regulated Voltage(U203, V_TCXO) is used in the TCXO.

The regulated Voltage(U203, V_SYNTH) is used in the PLL part.

The regulated Voltage(U203, 2.85VDD) is used in the Camera Display part and the T-Flash.

The regulated Voltage(U203, V_MOTOR) is used in the MOTOR.

The regulated Voltage(U203, V_LED) is used in the KEYPAD LED.

2-1-2. Inner Charging Circuit Part

The most important function of the charger shall be done in the PMIC(Power Management Circuit U203).

When the phone with a battery is connected with a travel charging adapter, the inner charging circuit of

the PMIC(U203) will charge the battery by constant fast charge mode.

When battery reaches regulation voltage of 4.2V (default charging voltage for Li+mode), the charge

current drops quickly to 0mA

- Input voltage range : 4.25∼6.5V

- Charging Temperature : 0°C∼40°C

- Charging Method : Constant Voltage/Current -Charging Current : Normal 550mA

- Charging Time : Standard (1100mAh) 2.5 ~ 3 Hrs , Extended (1700mAh) 3.5 ~ 4 Hrs

-ChargingMode:①Charging ②Completion

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Circuit Description

2-2

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- Charging Battery Regulation Voltage

①Min 4.158V, Typical 4.2V, Max 4.242V(at TA:0°Cto+85°C)

②Min 4.137V, Typical 4.2V, Max 4.263V(at TA:-40°Cto+85°C)

Universal Serial Bus Interface

SPH-A940 supports a Universal Serial Bus(USB) interface by the MSM6500, to provide an efficient

interconnection between the mobile phone and a Personal Computer(PC).

The MSM6500's USB interface is designed to comply with the Universal Serial Bus Specification,

Revision 2.0. An external USB transceiver(U203) is required to implement the USB interface.

2-1-3. Logic Part

The logic part consists of MSM, MEMORY, LCD, CAMERA, CCP, external MEMORY and other input and

output peripherals.

MOBILE SYSTEM MODEM(U101:MSM6500)

Industry standard ARM926EJ-S microprocessor is embedded. The MSM6500 chipset integrates

CDMA2000 1x and 1xEVDO service. The 1xEVDO solution can support High-speed peak data rates of

2.4Mbps on forward link and 153kbps on reverse link.

The MSM6500 device is offered in a 409 ball, 0.5mm pitch, CSP production package. Subsystems within

the MSM6500 device include a CDMA processor, a QDSP for voice compression, an ARM9TDMI

microprocessor.AlsointegratedintheMSM6500device are analog functions such as an audio voice

codec, PLL, transmit DACS,ADC

S, memories, USB controller, peripheral interfaces, and an enhanced

clock. It is one of the most important components of the CDMA cellular phone.

The interface circuitry consists of reset circuit, dual address/data bus and memory controls. The TCXO

clock of 19.2Mhz is used as the main clock of SPH-A940 model.

MCP : NAND FLASH and SDRAM (U102(KBE00F003M))

MCP is consist of two 512Mbit(64M*8) NAND FLASH and two 256Mbit(4M*16*4Banks) Mobile SDRAM.

NAND FLASH is used to store the Font data and program. EFS area is used to store ESN, NAM

information, telephone directory, SMS messages and other important information of the phone, and also

to store application programs and downloaded stuffs such as BREW applications and MP3. MCP is also

used to excute the DMSS(Dual Mode Subscriber system) software.

Using the down-loading program, the program can be changed even after the terminal is fully assembled.

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Circuit Description

2-3

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Keypad

For key recognition, key matrix is operated by using SCAN(0:7) and KEYSENCE(0:3) of the input ports

of MSM. 23 backlight LEDs and back-light circuitry are included in the keypad for easy operation in the

dark.

LCD Module

LCD is composed of a Transmissive with Micro Reflective(TMR) type Main TFT-LCD Panel, Transflective

type Sub TFT-LCD Panel, a driver circuit and a back-light unit.

The resolution of a 2.0" Main LCD(TMR) contains 176 * 220 pixels, the resolution of a 1.17" Sub

LCD(Transflective) contains 96 * 96 pixels.

Clock

CPU clock : 19.2MHz. Clock signal from the TCXO

Sleep clock : 32.768KHz. Clock signal for sleep.

TCXO/N : 19.2/N MHz. This clock source is used by various blocks of the MSM6500 device, such

as the ARM9CORE, UARTs, general-purpose PDMs and TCXO is also used by the

MSM6500 device to produce CHIPX8.

USB clock : 48MHz. Clock signal for the USB interface

CAMERA

The camera module consists of 1/3 type 2 Mega (2140K) Pixels CCD sensor, Digital signal processor,

and MPU. The camera module provides Auto Focus, 2x Optical Zoom, Auto Exposure, and Auto White-

Balance functionality.

CCP (Camera Control Processor)

CCP can support sensors up to 2M pixels. CCP directly transmits and previews the RGB data to the

LCD graphic memory by processing the sensor output data according to the MSM's command and

provides hardware based real-time JPEG compression and decompression. CCP can save the raw RGB

data up to SVGA resolution into its image buffer and allows the host processor to download with

scalable sized compressed data. In addition, CCP can download the compressed image to either store

the original RGB data or transfer the image to the LCD.

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Circuit Description

2-4

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Bluetooth module

Bluetooth module is a BluetoothTM 1.1 and 1.2 compliant, stand-alone baseband processor with an

integrated 2.4GHz transceiver. Bluetooth module supports any voice and/or data application that requires

the Bluetooth SIG standard Host Controller Interface (HCI) via UART and PCM audio interfaces.

Operation Clock: 19.2MHz

Low-Power Clock: 32.768KHz

2-1-4. RF Interface Part

CDMA Data Interface

- TX_Q_P, TX_Q_N, TX_I_P, TX_I_N (U400) : Tx analog signal used during CDMA

- RX_I_P, RX_Q_P, RX_I_N, RX_Q_N (U302) : RX analog signal used during CDMA

RF Interface

- TX : TX_AGC_ADJ(U101) is used to control the TX power,

PA_ON_PCS(U101) is used to control the PCS power amplifier and

PA_ON_CELL(U101) is used to control the CDMA power amplifier.

- RX : TRK_LO_ADJ(U101) is used to compensate the TCXO module.

2-1-5. Audio Part

The MSM6500 device integrates a stereo wideband voice/audio CODEC into the Mobile Station Modem.

The integrated CODEC contains all of the required conversion and amplification stages for the

audio front end.

The CODEC operates as a 13bit linear CODEC with the transmit(TX) and receive(RX) filters designed

to meet ITU-T G.712 requirements. The CODEC contains the software controlled amplifier for both the

receiving and transmitting sections. Also, the vocoding schemes used will be 13kbps QCELP and 8Kbps

EVRC. The QCELP vocoder is based in the MSM internally.

2-1-6. Tx Audio Path

The voice signal from the microphone is filtered and amplified by the internal OP-AMP and is converted

to PCM data by the internal CODEC in the MSM. And then these signals are applied to the the

MSM(U101)'s internal vocoder.

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Circuit Description

2-5

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2-1-7. Rx Audio Path

The PCM data from the MSM(U101) is inputted to the internal CODEC and the data will be decoded by

the internal DAC. Audio levels are adjusted by the amplifier. And then audio is sent to the receiver.

2-1-8. Speaker Path

When the MSM(U101) receives the data, its internal CMX generates bell and melody. The CMX bell and

melody generated in MSM6500 are sent to SAPA1D2.

The SAPA1D2 (stereo class - D audio power amplifier) is a high quality audio power conversion chip

generating 2.5W RMS output directly from the VBATT supply. It is a high efficiency audio amplifier for

mobile applications. The gain of amplifier in SPH-A940 set to 4(V/V) . The output generated in SAPA1D2

is intended to drive two speakers.

2-1-9. Key Tone Generator

The CODEC data out from the MSM6500 is converted to DTMF signal by TONE generator of internal

CODEC, which is then amplified by the internal audio amplifier to be sent to the receiver unit.

2-2. PCS Section

2-2-1. Receiver

LOW NOISE AMPLIFIER (U301)

The low noise amplifier(It is included in FC7510 : U301) amplifies a weak signal received from the base

station to obtain the optimum signal level.

RF BAND PASS FILTER (F302)

The RF BPF(F302) passes only a specific frequency(1960±30 MHz) from the signal received from the

mobile station. The bandwidth is 60 MHz.

VOLTAGE CONTROLLED OSCILLATOR(OSC301)

The VCO(OSC301) generates the signal having 1715 ~ 1788MHz frequency range.

The VCO's output frequency is changed by control voltage. The PLL in S1M8690X generates this control

signal and this signal is changed into DC control voltage by R-C Loop filter.

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Circuit Description

2-6

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Frequency Synthesizer Circuit

The PLL(Phased Locked Loop) block consists of VC-TCXO(OSC302), PLL in S1M8690X and

VCO(OSC301). Input reference frequency is generated at VC-TCXO(OSC302) and the RF local signal is

generated at VCO. PLL compares the two signals and generates the desired signal with a

preprogrammed counter which controls voltage.

VOLTAGE CONTROLLED TEMPERATURE COMPENSATED CRYSTAL OSCILLATOR (OSC302)

The VC-TCXO (OSC302) is a reference source of the frequency synthesizer. It provides 19.2MHz

reference frequency to PLL-IC. It is a voltage controlled temperature compensated crystal

oscillator having 19.2MHz ±2.5ppm frequency stability over all useful temperature range.

A correct frequency tuning is made by the control voltage.

2-2-2. Transmitter

Intenna

Intenna sends signal to the base station and receives the signal from the base station.

It is a tri-band Intenna and covers PCS band, CDMA band and GPS band.

RF Switch

It(U405) is used to switch the PCS path, the CDMA path and the GPS path, The RF signal passes

through PCS & CDMA path when GPS_MODE is low.

GPS_MODE is a digital signal from MSM6500 GPIO.

Duplexer

Duplexer(F402) allows to transmit only the signals within acceptable Tx frequency range

(1880 ± 30 MHz) through the Intenna.

It provides the appropriate attenuation of transmitted signal at the receiver input and the appropriate

rejection of the transmit-generated noise in the Receiver band.

Power Amp

Power amplifier module(U404:ACPM-7833-DC1) amplifiers signal to be sent to the base station

through the antenna.

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