SAMSUNG SCWF200DYTEL Service Manual

FIXED WIRELESS PHONE

Manual

SCW-F200

S E RVICE

FIXED WIRELESS PHONE

CONTENTS

1. Specification

2. NAM Programming

3. Data Transfer

4. Setup Method

5. Circuit Description

6. Troubleshooting

7. Exploded Views and Parts List

8. PCB Diagrams

9. Electrical Parts List

10. Block & Circuit Diagrams

Samsung Electronics Co.,Ltd.

GH68-60683A

2. NAM Programming

2.1 Switching the NAM(Numeric Assignment Module) writing mode

If you performs NAM writing mode, you have to enter the password, '4, 7, *, 8, 6, 9, #, 0, 8, #, 9'.

Keypads using in NAM writing mode are as follows : 0~9 : numberic keys

, # : Use to specify the variable which include several value.

VOLUME KEY : Use to switch the next item CLR : Use to retouch a wrong digit HOOK ON : Use to end a NAM writing mode STO : Use to store data and switching the next function RCL : Use to swich the last menu

Caution

-If you enter the NAM progrm mode, the last data displays on screen . When you need not change the data, press VOLUME key to go to the next item.

-You can modify the data by entering a new data. And if you enter a wrong digit, press CLR to delete the last digit.

-If you enter a wrong digit in the middle of NAM entering, continue to enter the next digits. After that check and modify the data using volume key.

- While you check the data using volume, you can store the data by pressing STO key.

- When you enter the NAM, as there are necessary information enter the phone number and LOCK code

and press STO key.

When you enter NAM programming, display following three items.

1 GENERAL ; Display the variable used commonly NAM.

2 Setup NAM ; Display the variable of CDMA used commonly when you select NAM.

If you don't store the data by pressing STO key after modifying as explains, the data does not change. You can check the data by pressing VOLUME key without changing the data.

Samsung Electronics 2-1

NAM Programming

2-2 Explaination about each item

2-2-1 GENERAL

When swiching the next item, press volume or STO key. (When you press STO key, store entered data.)

ESN ( Electronic serial number) : In Service Program, current ESN cannot be modifyed and entered but

displayed. If you want to modify ESN, special ESN Write Program is needed. For more details, refer to 'ESN Writer manual'

CAI version (common Air Interface version) : The version of the Common Air Interface supported by the

mobile. Default setting is 2, CAI Version is not reset by user.

SCM (Station Class Mark) : Station Class Mark(SCM) displays the power class, transmission, slotted, dual

mode. SCM is not reset by user.

Lock Code : Default lock cord is 0000. It can be entered from 0000 to 9999.

SLOT Mode : Determine the slot mode of the mobile (using Yes-slot mode)

When changing ‘YES’ or ‘NO’, press or #.

Slot Index : Determine the solt mode index on slot mode the mobile.

The extent of index is from 0 to 9. The bigger the index of set, the longer sleeping time. The sleeping time is longer the more power is saved. Default setting is 2.

2-2 Samsung Electronics

NAM Programming

2-2-2 Setup NAM

When you swich the next item, press volume or STO key. (If you press STO key, store the entered variable).

IMSI_MCC : Enter Mobile Country Code Default setting is 000. IMSI_MNC : Enter Mobile Network Code Default setting is 00. CDMA TEL NO : It is telephone number for CDMA

CDMA Pref : Select preferred system in using CDMA.

Home only, A only, A pref, B only, B pref.

CDMA ACCOLC : CDMA ACCESS OVERLOAD CLASS Default setting is 0. Pchn Sys A : This is preferred system in using A system. OOO set 779, OOO set 0. Pchn Sys B : This is preferred system in using B system. Default setting of OOO is 779 channel. Default

setting of OOO is 486 channel.

Schn Sys A : This is the second preferred system in using A system. OOO set 738, OOO set 0. Schn Sys B : This is the second preferred system in using B system. Default setting of OOO is 738 channel.

Default setting of OOO is 568 channel.

CD Acq SID 1~CD Acq SID 6 : CDMA Acquisition SID. Enables you to set up to six SIDs. Default setting is

0, ranges from 0 to 32,767.

CD lock SID 1~CD lock SID 6 : CDMA lock SID

Enables you to set up to six SIDs. Default setting is 0, ranges from 0 to 32767

CDMA Home SID : CDMA home SID Default setting is 'YES'.

Specify the Autonomous requisition in the home system.

SID #1 : (SID,NID) This is the first SID in using list. NID #1 : (SID,NID) This is the first NID in using list.

SID #2 : (SID,NID) This is the second SID in using list. NID #2 : (SID,NID) This is the second NID in using list. SID #3 : (SID,NID) This is the third SID in using list SID #3 : (SID,NID) This is the third NID in using list SID #4 : (SID,NID) This is the fourth SID in using list SID #4 : (SID,NID) This is the fourth NID in using list SID #5 : (SID,NID) This is the fifth SID in using list SID #5 : (SID,NID) This is the fifth NID in using list

Samsung Electronics 2-3

NAM Programming

The mobile determines the roaming status.

SID, NID list of OOOO and OOO is follingxzd

OOO : (2222, 1) (2222, 2) (2222, 3) (2222, 15) (0, 0) OOO : (1700, 1) (1700, 2) 1700, 3) (1700, 15) (0, 0)

2-4 Samsung Electronics

2-3 Setting Up NAM

LCD Display Key in Function

NAM Programming

47*809#08#9

NAM Program 1:General 2:Setup NAM

ESN

B00000000

CAI version

SCM

01101010

Lock Code

0000

47 869#08#9 -selects NAM programming

1 -choose 'GENERAL.'

Volume Electronic Serial Number of the phone.

Volume

The version of the Common Air Interface supported by the mobile.

Volume Station Class Mark displays the power class (bit 0~1),

transmission (bit2), slotted (bit5), dual mode (bit6).

(0000) 4-digit code Four-digit number supplied by the user which enables STO electronic locking of the phone.

Slot Mode

Yes

Slot Index

Pref NAM... Digital pref

or Enables slot mode.

STO

0 - 7 Slot mode index.

STO Specifies the duration and frequency of times that the mobile

checks the paging channel. The higher the value, the less often the mobile looks at the paging channel, and the more power is saved.

or Preferred system selection for NAM.

STO Up to four NAMs are allowed for the phone. This lists one of the

four NAMs and allows you to program both the FM and CDMA settings.

Samsung Electronics 2-5

NAM Programming

LCD Display Key in Function

IMSI MCC

000

IMSI MNC

CDMA TEL NO.

987654321

CDMA pref...

B only

CDMA ACCOLC

Pchn Sys A

Pchn Sys B

486

Pchn Sys A

number International Mobile Station Identity Mobile Country Code.

STO

number International Mobile Station Identity Mobile Network Code.

STO

phone number CDMA phone number.

STO

or Preferred system selection.

STO

class number CDMA Access Overload Class.

STO This two-digit number specifies the level of priority assigned

to the mobile for accessing the system. Ranges from 0 to 15.

channel number Primary CDMA channel for the A carrier.

STO Ranges from 0 to 1,023. 0 indicates no channel.

channel number Primary CDMA channel for the B carrier. STO Ranges from 0 to 1,023. 0 indicates no channel.

channel number Secondary CDMA channel for the A carrier.

STO Suggested setting is 0: ranges from 0 to 1,023.

Schn Sys B

568

CD Acq SID (1-6)

CD lockSID (1-6)

CDMA HomeSID

Yes

channel number Secondary CDMA channel for the B carrier. STO Suggested setting is 0: ranges from 0 to 1,023.

ID number CDMA Acquisition System ID. STO Enables you to set the phone to acquire up to six SIDs in the

CDMA mode. If you enter ‘0’ for any SID, the program assumes that you have no more numbers to store. Default setting is 0: ranges from 0 to 32,767: up to six SIDs.

ID number CDMA Lock System ID. STO Enable you to specify up to six SIDs that the phone will be

prohibited from acquiring in CDMA mode. If all six SIDs are set to zero, no lock restrictions will be in effect and the phone can acquire all SIDs. Default setting is 0: ranges from 0 to 32,767 up to six SIDs.

or CDMA Home System ID.

STO Enables the phone to allow mobile terminated calls while in

the home system. Controls the types of registration allowed for the phone.

2-6 Samsung Electronics

LCD Display Key in Function

NAM Programming

CDMA fSID

CDMA fNID

SID #1

NID #1

Yes

1700

or CDMA foreign System ID.

STO Enables the phone to allow mobile terminated calls while

in a foreign system. Controls the types of registration allowed for the phone.

or CDMA foreign Network ID.

STO Enables the phone to allow mobile terminated calls while

in a foreign system and foreign network ID. Controls the types of registration allowed for the phone.

number System Identification Number. STO Controls how the phone acquires different systems.

Determines the roaming status for the mobile. All SIDs range from 0 to 32,767: a 0 setting for the SID signifies that it is not active.

number Network Identification Number.

STO Controls how the phone acquires different systems, and is

set and specified in conjunction with each SID (e.g., SID #1, NID #1). Determines the roaming status for the mobile. All SIDs range from 0 to 65,535: a 0 setting for one NID signifies that it is not active.

SID #2

NID #3

SID #4

NID #4

SID #5

1700

number See SID #1.

STO

number See NID #1.

STO

number See SID #1.

STO

number See NID #1.

STO

number See SID #1.

STO

number See NID #1.

STO

number See SID #1.

STO

NID #5

number See NID #1.

STO

Samsung Electronics 2-7

NAM Programming

2-8 Samsung Electronics

£´140 30 ~ £´60 )

Operating Temperature : 4 ~ 122 ( 20 ~ £´50 )

Operating Voltage

Battery : 5.0V DC ( 10 ) Adapter : 11.0V DC ( 20 )

Size and Weight

w/ battery :218 °ø210 °ø73 mm 1183 gr

Samsung Electronics 1-1

1. Specification

Operating Time

Digital mode

Standby Time

51~ 75 hours

(slot index 2)

Talk Time

6 hours

w/ battery

1-1 General

Frequency Range Digital Mode

Transmitter : 824.64 ~ 848.37 MHz Receiver : 869.64 ~ 893.37 MHz

Channel Spacing : 1.23 MHz 30 kHz

Number of Channels : 20 FA 832 CHs

Duplex Spacing : 45 MHz

Frequency Stability : 2.5 ppm ( 22 ~

Specification

£´1.5 dBm

104 dBm : £´18.0 dBm ~ £´30.0 dBm

Standby Output Power : below 61 dBm

Closed Loop TX Power Control Range : Test 1 beyond 24 dB

Test 2 0 mS ~ 2.5 mS Test 3 beyond 24 dB Test 4 beyond 24 dB

Test 5 beyond 24 dB

MSC Transmitter Frequency

FA NO. CH. NO. CENTER FREQUENCY FA NO. CH. NO. CENTER FREQUENCY

1 1011 824.640MHz 11 404 837.120MHz 2 29 825.870MHz 12 445 838.350MHz 3 70 827.100MHz 13 486 839.580MHz 4 111 828.330MHz 14 527 840.810MHz 5 152 829.560MHz 15 568 842.040MHz 6 193 830.790MHz 16 609 843.270MHz 7 234 832.020MHz 17 650 844.270MHz 8 275 833.250MHz 18 697 845.910MHz 9 316 834.480MHz 19 738 847.140MHz

10 363 835.890MHz 20 779 848.370MHz

1-2 Digital Mode

Waveform Quality : above 0.944 Time Reference : within 1uS RX Sensitivity : 104 dBm, FER = within 0.5%

Dynamic Range : 104 dBm ~ 25 dBm, FER = within 0.5% TX Output Power : Maximum 320 mW (25dBm) TX Frequency Deviation : within 300 Hz Occupied Band Width : 1.32 MHz TX Conducted Spurious Emissions : 900 kHz below 42 dBc / 30 kHz

: 1.98 MHz below 54 dBc / 30 kHz Minimum TX Power Control : below 50 dBm Open Loop Power Control : 25 dBm : 57.0 dBm ~ 38.5 dBm

65 dBm : 17.5 dBm ~

1-2 Samsung Electronics

MSC Receiver Frequency

FA NO. CH. NO. CENTER FREQUENCY FA NO. CH. NO. CENTER FREQUENCY

1 1011 869.640MHz 11 404 882.120MHz 2 29 870.870MHz 12 445 883.350MHz 3 70 872.100MHz 13 486 884.580MHz 4 111 873.330MHz 14 527 885.810MHz 5 152 874.560MHz 15 568 887.040MHz 6 193 875.790MHz 16 609 888.270MHz 7 234 877.020MHz 17 650 889.270MHz 8 275 878.250MHz 18 697 890.910MHz 9 316 879.480MHz 19 738 892.140MHz

10 363 880.890MHz 20 779 893.370MHz

Specification

Samsung Electronics 1-3

Specification

1-4

Samsung Electronics

4. Setup Method

Samsung Electronics 4-1

Operating Instruction

4-2 Samsung Electronics

6. Circuit Description

6-1 Logic Section

6-1-1 Power Supply

With the battery installed on the phone and by pressing the PWR key, the VBATT and ON_SW signals will be connected. This will turn on Q102 (2SC4081BR) and will drive DC-DC converter (U123) to output 5.0V. This in turn will be supplied to pin 6 of regulators (U121 and U122), thus releasing them from the shut-down state to output regulated 3.3V.

The VBATT applied to ON_SW will turn on Q103 (DTC144EE) resulting in the signal ON_SW_SENSE to change state from HIGH to LOW. This will allow MSM to send out PS_HOLD (logical HIGH) to turn on Q102 even after the PWR key is released.

The voltage (+3.3V) from U121 is used in the digital parts of MSM and BBA. The voltage (+3.3AV) from U122 is used in the analog part of BBA. The voltage from U124 (output of 5V) is used for the audio circuitry.

6-1-2 Logic Part

The Logic part consists of internal CPU of MSM, RAM, ROM and EEPROM. The MSM receives TCXO and CHIPX8 clock signals from the BBA and controls the phone during the CDMA and the FM mode. The major components are as follows:

CPU : INTEL 80186 core FROM : U126 (MBM29LV800T) - 8MBIT

FLASH ROM

SRAM : U127 (KM68V2000I) - 2MBIT

STATIC RAM

EEPROM : U113 (AT24C128) - 128KBIT SERIAL

EEPROM

CPU

INTEL 80186 CMOS type 16-bit microprocessor is used for the main processing. The CPU controls all the circuitry. For the CPU clock, 27MHz resonator is used.

FLASH ROM

One 8 MBIT FROM is used to store the terminal's program. Using the down-loading program, the program can be changed even after the terminal is fully assembled.

SRAM

One 2 MBIT SRAM is used to store the internal flag information, call processing data, and timer data.

EEPROM

One 128 KBIT EEPROM is used to store ESN, NAM, power level, volume level, and telephone number.

KEYPAD

For key recognition, key matrix is setup using SCAN0-6 of STORE signals and KEY0-3 of input ports of MSM. Eight LEDs and backlight circuitry are included in the keypad for easy operation in the dark.

LCD MODULE

LCD module contains a controller which will display the information onto the LCD by 8-bit data from the MSM. It also consists a DC-DC converter to supply -3.5V for fine view angle and LCD reflector to improve the display efficiency.

Samsung Electronics - Contents may change without notice. 6-1

Circuit Description

6-1-3 Baseband Part

MOBILE SYSTEM MODEM (MSM)

The MSM equipped with the INTEL 80186 CPU core is an important component of the CDMA cellular phone. The MSM comes in a 176 pins TQFP package. The interface block diagram is shown on page 6-3.

MICROPROCESSOR INTERFACE

The interface circuitry consists of reset circuit, address bus (A0-A19), data bus (AD0-AD15), and memory controls (ALE, DT_R, HWR/, LWR/, RAM_CS/, ROM_CS).

INPUT CLOCK

CPU clock: 27 MHz TXCO/4 (pin 34): 4.92 MHz. This clock signal from the BBA is the reference clock for the MSM except in CDMA mode. CHIPX8 : 9.8304 MHz. The reference clock used during the CDMA mode.

ADC Interface

ADC_CLK (pin 3), ADC_ENABLE (pin 1) and ADC_DATA (pin 2) are required to control the internal ADC in the BBA.

Data Port Interface

Includes the UART. Also, supports Diagnostic Monitor (DM) and HP equipment interface.

CODEC Interface

The MSM outputs 2.048 MHz PCM_CLK (pin 19) and 8 KHz CODEC_SYNC (pins 16,20) to the CODEC (U117). The voice PCM data from the MSM (U101) PCM_DIN (pin135) is compressed into 8KHz by QCELP algorithm in the CDMA mode. In FM mode, the data is processed by D_FM.

RF Interface

BBA INTERFACE

CDMA, FM Data Interface

TXIQDATA0-7 (pins 24-32) : TX data bus used during both CDMA and FM mode. C_RX_IDATA0-3 (pins 16-20) and C_RX_QDATA0-3 (pins 12-15) : RX data bus used during CDMA mode. FM_RX_IDATA (pin 7) and FM_RX_QDATA (pin 8) : RX data bus used during FM mode.

Clock

TX_CLK (pin 22), TX_CLK/(pin 23) : Analog to Digital Converter (ADC) reference clock used in TX mode. CHIPX8 : ADC reference clock used in CDMA RX mode. FMCLK : Reference clock in FM RX mode.

TX : TX_AGC_ADJ (pin 35) port is used to control the TX power level and PA_ON (pin 44) signal is used to control the power amplifier.

RX : AGC_REF (pin 36) port is used to control the RX gain and TRK_LO_ADJ (pin 45) is used to compensate the TCXO clock.

General Purpose I/O Register Pins

Input/output ports to control external devices.

Power Down Control

When the IDLE/ signal turns LOW, only the TX sections will be disabled. If both the IDLE/ and SLEEP/ changes to LOW, all the pins except for the TXCO is disabled.

6-2 Samsung Electronics - Contents may change without notice.

Circuit Description

Figure 6-1 Baseband Block Diagram

Samsung Electronics - Contents may change without notice. 6-3

Circuit Description

6-1-4 Audio Part

TX AUDIO PATH

The voice signal output from microphone is filtered and amplified by the internal OP-AMP and is converted to PCM data by the CODEC (U117). This signal is then applied to the MSM (U101)'s internal vocoder.

RX AUDIO PATH

The PCM data out from the MSM is converted to audio signal by ADC of CODEC (U117), is then amplified by the speaker amplifier (U111) to be sent to the speaker unit.

FM TX PATH

Pre-Emphasis Circuit

The circuit features +6dB/oct to reduce signal loss and noise in Tx path.

Compressor

RX AUDIO PATH

De-Emphasis Circuit

This circuit is 1st LPF featuring -6dB/oct to reduce signal loss and noise in Rx path.

Expander

The expander features 1:2 level to reduce signal loss and noise in Rx path. The zero crossing level of the expander is 2.9 kHz/dev, attack time is 3 mS, and release time is 13.5 mS.

Volume Adjust

Volume can be adjusted up to 4 steps for the user to obtain a proper loudness of received signal.

6-1-5 TX WBD, ST, And SAT

These signals are generated from MSM. The modulation level of TX WBD and ST is

8kHz/dev, and SAT is 2kHz/dev.

The compressor features 2:1 level to reduce signal loss and noise in Tx path. The zero crossing level of the compressor is 2.9 kHz/dev, attack time is 3 mS, and release time is 13.5 mS.

Limiter

The limiter performs to cut 0.53 Vp-p or higher audio signal level so that the FM frequency deviation is not over 12kHz/dev. The function is used to avoid confusion over phone line. LPF is used to reduce a specific high frequency of limited signal.

6-1-6 Buzzer Driving Circuitry

Buzzer generates alert tone. When the buzzer receives the timer signal from the MSM, it generates alert tone. The buzzer level is adjusted by the alert signal's period generated from the MSM timer.

6-1-7 Key Tone Generator

Ringer signal (pin 49) out from MSM (U101) is passed through 2 serial LPF consisting of R141, C145, R145, and C142, amplified at the speaker amp (U111), and comes out to speaker. In handsfree mode, the key tone is applied to RX audio line through the LPF and C153, R142.

6-4 Samsung Electronics - Contents may change without notice.

6-2 Receiver Section

Circuit Description

LOW NOISE AMPLIFIER (LNA)

The low noise amplifier featuring 1.5dB and 16 dB gain amplifies a weak signal received from the base station to obtain the optimum signal level.

DOWN CONVERTER (MIXER)

First local signal is applied to this down converter. The down converter transfers the signal amplified at the LNA into 85.38 MHz IF signal. 85 MHz IF signal is made by subtracting 881 12.5 MHz RF signal from 966 12.5MHz first local signal.

RX IF AUTOMATIC GAIN CONTROLLER (AGC) AMP

85.38 MHz IF signal is applied to IF AGC amp, the IF AGC output level is applied to BBA (Baseband Analog ASIC). The IF AGC amp (U302) keep the signal at a constant level by controlling the gain. Dynamic range is 90 dB, up gain +45dB, and down gain -45dB.

IF SAW BAND PASS FILTER FOR CDMA

IF SAW BPF (F303) is used for CDMA system having 1.23 MHz wide band and 630 kHz band width. The filter also eliminates the image product generated at the mixer.

BUFFER

Buffer (Q342) amplifies signal to be applied to the local input of the down converter (U301) when a phase is locked between VCO (U341) and PLL IC (U342).

VOLTAGE CONTROLLED OSCILLATOR

The VCO (U341) generates the signal having 966 MHz center frequency and 12.5 MHz deviation

with the voltage control. PLL IC (U342) controls this signal.

PHASE LOCKED LOOP (PLL)

RF BAND PASS FILTER (BPF)

The RF BPF (F302) accepts only a specific frequency (881 12.5MHz) from the signal received from the mobile station. The band width is 25 MHz.

IF SAW BAND PASS FILTER FOR AMPS

IF SAW BPF (F304) is used for AMPS system having 30 kHz channel spacing and 15 kHz band width. The filter also eliminates the image product generated at the mixer.

Input reference frequency is generated at VC_TCXO (U343) and the divided signal is generated at VCO (U341). PLL compares the two signals and generates the desired signal with a pre-programmed counter which controls voltage.

VOLTAGE CONTROLLED TEMPERATURE COMPENSATED CRYSTAL OSCILLATOR

It provides 19.68 MHz reference frequency to the mobile main set. A correct frequency tuning is made by the voltage control.

THERMISTOR

The thermistor (U371) detects temperature. It is used to compensate active component characteristics due to the temperature difference.

Samsung Electronics - Contents may change without notice. 6-5

Circuit Description

DUPLEXER

Duplexer (F301) controls to transmit through the antenna only the signals within acceptable Tx frequency range (836 12.5 MHz) and to receive through the antenna only the signals within acceptable Rx frequency range (881 12.5 MHz). It also matches LNA (U301) input in receiving part and PA output in transmitter part with the antenna.

6-3 Transmitter Section

BASEBAND ANALOG ASIC (BBA)

BBA (U401) consists of ADC, DAC, LPF (FM/CDMA), divider, VCO, logic control circuit, PLL, and mixer.

BBA performs a specific function between RF part and logic part, with MSM. The IF signal out from

Rx IF AGC amp is secondly converted through the

down-converter. The signal passes through the

CDMA or FM filter, converts to digital signal

through ADC, then is sent to MSM. The digital signal out from MSM converts to analog signal through DAC. The analog signal converts to the IF signal through each filter and the up-converter.

POWER SUPPLY REGULATOR

The power supply regulator (U381, U382) generates a regulated power (3.6VR).

ANTENNA

Antenna (ANT1) allows signals to send to receive from the base station.

IF AUTOMATIC GAIN CONTROLLER AMP

The signal out to the base station should be a constant level. The TX IF AGC amp (U460) controls power to keep the signal at a constant level. Dynamic range is 85 dB, up gain +40dB, and down gain -45dB.

RF BAND PASS FILTER (BPF)

The RF BPF (F451) accepts only a specific frequency (836 12.5MHz) to send it out to the base station. The band width is 25 MHz.

POWER SUPPLY SWITCHING

POWER AMP MODULE

Power supply switching (Q483) turns on Power Amp module (U467) amplifies signal (28 dB Gain) to be sent out to the base station through the

antenna .

TX_POWER when the phone is in traffic mode and

supplies power to the circuits.

ISOLATOR UP CONVERTER (MIXER)

The up-converter (U461) receives the first local signal to generate 836 12.5 MHz from the signal controlled by TX IF AGC amp (U460). 836 12.5 MHz signal comes out from the mixer output by subtracting 130 MHz IF signal from 966 12.5 MHz first local signal. The driver amp and this upconverter are packaged into one in U461.

6-6 Samsung Electronics - Contents may change without notice.

Isolator (U468) is used to reduce a reflected signal

to protect the power amp module from being

damaged.

POWER SUPPLY REGULATOR

The power supply regulator (U482, U483) supply a

regulated power to each part of transmitter. U483

supplies 4.7V to TX mixer (U461) and OP amp

(U463). U482 supplies 3.6 V to TX IF AGC amp

(U460).

6-4 Rapid Desk-Top Charger

Rapid Charger, DTC58 is composed of power supply part and control part.

Circuit Description

6-4-1 Power Supply Part (Flyback type

SMPS circuit)

AC INPUT

AC input protection circuit and rectifier circuit

AC power through the AC plug is rectifiered to DC power of high voltage through the BD1 and C2. MOV1 is used by protection circuit from AC power surge. F1 is fuse to prevent over current. C1 and LF1 is EMI noise protection filter of switching power.

Switching controller and transformer

IC1 supplies constant voltage and constant current to secondary circuit through the transformer. D1, D2 absorbs the reverse voltage when transformer winding turns off.

SECONDARY POWER

Secondary DC/DC converter circuit : Q2, D8, L3, C19

It changes the DC output voltage to 8.4V through step-down chopper method.

Reverse current protection circuit : D6, D7

When power is off, it protects the reverse flow of current from battery pack.

6-4-2 Control Part

MICOM CONTROLLER : HIC

HIC is include u-COM to controlled whole charging system and include following internal circuit :

-General Input/Output port

-A/D converter

-Reset delay circuit (Power on delay)

-Timer

Output constant voltage circuit : HIC, IC7, VR1

The HIC detects output voltage and compares it with reference voltage in HIC. The error is FED to primary circuit by IC7A. The feeback error is converted to current by IC7B and D3. The current controlls IC1.

It is carried following functions :

-Battery Recognition

-Charging termination condition detection

-Output short detection and output protection

-Temperature detection

BATTERY RECOGNITION CIRCUIT : HIC

Secondary rectifier circuit : D4, D5, C8, C11

The secondary AC output of transformor is rectified to DC voltage.

Secondary filter circuit : L1, L2, C9, C12

It minimizes the high frequency ripple noise, which is caused by primary oscilation.

Samsung Electronics - Contents may change without notice. 6-7

Battery identity detection determined to voltage detection battery internal between C/F and GND.

Circuit Description

CURRENT DETECTION CIRCUIT : R5, R6, R11, R12, HIC

Battery charging current is changed voltage through R5, R6, R11, R12. This voltage inputed u-COM to 16 times amplifiered through HIC.

VOLTAGE DETECTION CIRCUIT : HIC

u-COM A/D through HIC pin 12, 13 detected voltage.

6-5 Hands-Free Kit

6-5-1 Charging Circuit

BATTERY TEMPERATURE DETECTION CIRCUIT : HIC, TH1

Battery temperature detection determined temperature by ues of thermistor registor variation of THI by HIC.

CURRENT LIMIT CIRCUIT : HIC

When soft-change, current detection circuit limited current flow to battery, reference voltage more than detected current, detected current and HIC internal reference voltage.

6-5-3 Speaker circuit

A constant voltage is used for the hands-free kit. This circuit converts DC 12V input current to 8.4V DC to charge the battery. When the battery is fully charged, the charge current drops and the circuit operates as a constant voltage.

6-5-2 u-Processor

Micro processor controls charging power and charging current to protect the phone. It also allows to communicate with a HHP, and to convert from hands-free mode to private mode, and vice verse. It adjusts speaker volume at 8 steps and attenuates echo and noise occurred during conversation.

This circuit eliminates HHP noise, and controls the sound quality and speaker volume using analog C-mos IC which checks the speaker signal up to 8 steps. 5W audio amplifier amplifies the speaker signal.

6-5-4 Microphone Circuit

This circuit separates ground to eliminate the noise occurring from the HHP antenna and microphone. u-processor controls this circuit to attenuate echo which may occur in Land side.

6-8 Samsung Electronics - Contents may change without notice.

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