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Company Confidential

s

Com

Copyright 2005© Siemens AG

Page

43

of

53

TD_Repair_L2.5_A70_A75_R1.0.pdf Release

1.0

9.3 Charging Concept

Charging current
Charging control signal

9.3.1.1 Charging Concept

General

The battery is charged in the unit itself. The hardware and software is designed for LiIon with
4.2V technology.
Charging is started as soon as the phone is connected to an external charger. If the phone is
not switched on, then charging takes place in the background (the customer can see this via
the “Charge” symbol in the display). During normal use the phone is being charged
(restrictions: see below).
Charging is enabled via a PMOS switch in the phone. This PMOS switch closes the circuit for
the external charger to the battery. The

EGOLDlite

takes over the control of this switch

depending on the charge level of the battery, whereby a disable function in the

POWER

SUPPLY ASIC

hardware can override/interrupt the charging in the case of over voltage of the

battery (only for Manganese Chemistry Battery types e.g. NEC).
With the new slim Lumberg IO connector we lose the charger recognition via SB line. Now
we measure the charge current inside the

POWER SUPPLY ASIC

with a current monitor.

The charging software is able to charge the battery with an input current within the range of
350-600mA. If the Charge-Fet is switched off, then no charging current will flow into the
battery (exception is trickle charging, see below).
For controlling the charging process it is necessary to measure the ambient (phone)
temperature and the battery voltage. The temperature sensor will be an NTC resistor with a
nominal resistance of 22k

Ω

at 25°C. The determination of the temperature is achieved via a

voltage measurement on a voltage divider in which one component is the NTC. The NTC for
the ambient temperature will be on the PCB (26 MHz part).

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Содержание A70

Страница 1: ... s Com Copyright 2005 Siemens AG Page 1 of 53 TD_Repair_L2 5_A70_A75_R1 0 pdf Release 1 0 Service Repair Documentation Level 2 5e A70 A75 Release Date Department Notes to change 1 0 06 06 2005 ICM MP CCQ GRM T New document ...

Страница 2: ...K DIAGRAM RF PART 10 6 2 POWER SUPPLY RF PART 11 6 3 FREQUENCY GENERATION 11 6 4 RECEIVER 15 6 5 TRANSMITTER 16 6 6 BRIGHT IC OVERVIEW 17 6 7 ANTENNA SWITCH ELECTRICAL MECHANICAL 19 7 Logic Control 22 7 1 OVERVIEW OF HARDWARE STRUCTURE A70 22 7 2 OVERVIEW OF HARDWARE STRUCTURE A75 23 7 3 EGOLDLITE 24 7 4 SRAM 30 7 5 FLASH 30 7 6 SIM 30 7 7 VIBRATION MOTOR 30 7 8 DISPLAY MODULES 31 7 9 ILLUMINATION...

Страница 3: ...iemens AG Page 3 of 53 TD_Repair_L2 5_A70_A75_R1 0 pdf Release 1 0 10 Interfaces 46 10 1 VIBRA XG220 46 10 2 EARPIECE XG243 47 10 3 MICROPHONE 48 10 4 BATTERY X181 48 10 5 IO CONNECTOR X211 WITH ESD PROTECTION Z211 49 10 6 SIM 51 11 Keyboard 52 ...

Страница 4: ...est Instruction document both documents are available in the Technical Support section of the C market Check at least weekly C market for updates and consider all A70 A75 related Customer Care Information and Repair Information who are relevant for A70 A75 A70 Partnumber on IMEI label S30880 S2770 xxx A75 Partnumber on IMEI label S30880 S2790 xxx while may be any letter A Z and xxx may be any numb...

Страница 5: ...3 IC FEM HITACHI GSM900 1800 1900 Fem Type5 A70 HIT D903 L50620 L6170 D670 IC TRANCEIVER HD155165BP PB Free A70 HIT N308 L50610 C6153 D670 IC V REG 2 9V Vr Type2 PB Free A70 HIT R106 L36852 C X RESISTOR 0R0 Res Type8 A70 HIT R141 L36852 C X RESISTOR 0R0 Res Type8 A70 HIT R201 L36852 C X RESISTOR 0R0 Res Type8 A70 HIT R204 L36852 C X RESISTOR 0R0 Res Type8 A70 HIT R205 L36852 C X RESISTOR 0R0 Res T...

Страница 6: ...TOR 2U2 Cap Type4 A75 HIT C289 L36377 F6225 M CAPACITOR 2U2 Cap Type4 A75 HIT C362 L36853 C9104 M4 CAPACITOR 100N Cap Type2 A75 HIT C363 L36853 C9104 M4 CAPACITOR 100N Cap Type2 A75 HIT C364 L36853 C9104 M4 CAPACITOR 100N Cap Type2 A75 HIT C365 L36853 C9104 M4 CAPACITOR 100N Cap Type2 A75 HIT C366 L36853 C9104 M4 CAPACITOR 100N Cap Type2 A75 HIT C367 L36853 C9104 M4 CAPACITOR 100N Cap Type2 A75 HI...

Страница 7: ...69 D670 IC V REG LM2794TLX Vr Type5 PB Free A75 HIT N307 L50610 C6232 D670 IC V REG 1 8V Vr Type3 A75 HIT N308 L50610 C6153 D670 IC V REG 2 9V Vr Type2 PB Free A75 HIT R106 L36852 C X RESISTOR 0R0 Res Type8 A75 HIT R141 L36852 C X RESISTOR 0R0 Res Type8 A75 HIT R205 L36852 C X RESISTOR 0R0 Res Type8 A75 HIT R221 L36852 C X RESISTOR 0R0 Res Type8 A75 HIT R222 L36852 C X RESISTOR 0R0 Res Type8 A75 H...

Страница 8: ...2 P226 A1 Troubleshooting Frame A62 A65 A70 A75 F30032 P405 A1 Power Supply Spectrum Analyser Active RF Probe incl Power Supply Oscilloscope incl Probe RF Connector N SMA f Power Supply Cables Dongle F30032 P28 A1 if USB Dongle is used a special driver for NT is required Soldering and BGA Soldering equipment for lead free soldering Reference Equipment recommendation downloadable from the technical...

Страница 9: ...ion in the EGSM900 and GSM1800 band is impossible too However the monitoring band monitoring timeslot in the TDMA frame can be chosen independently of the receiving respectively the transmitting band RX and TX timeslot of the band The RF part is dimensioned for triple band operation EGSM900 DCS1800 PCS19000 supporting GPRS functionality up to multiclass 8 The RF circuit consists of the following c...

Страница 10: ...Company Confidential s Com Copyright 2005 Siemens AG Page 10 of 53 TD_Repair_L2 5_A70_A75_R1 0 pdf Release 1 0 6 1 Block diagram RF part ...

Страница 11: ...via SLEEPQ TDMA Timer R11 and VCXOEN_UC M4 provided by the EGOLDlite The temporary deactivation is used to extend the stand by time Circuit diagram VDD_RF1 VDD_RF2 6 3 Frequency generation Synthesizer The discrete VCXO 26MHz The A70 A75 mobile is using a reference frequency of 26MHz The generation of the 26MHz signal is done via a VCO Z950 TP test point of the 26MHz signal is the TP 820 The oscill...

Страница 12: ...equency is controlled by the RF_AFC signal generated through the internal EGOLDlite D171 A10 PLL Reference for the EGOLD PLL is the base station frequency received via the Frequency Correction Burst The required voltage VDD_RF2 is provided by the ASCI D361 Waveform of the AFC_PNM signal from EGOLDlite to Oscillator E G O L D G N D G N D R 2 R F _ A F C S ignalform C1 C2 A F C _ P N M G N D C3 R 3 ...

Страница 13: ... this the loopfilter and currents are switched into normal mode to get the necessary phasenoise performance The PLL is controlled via the tree wire bus of Bright VI E RFVCO LO1 The first local oscillator is needed to generate frequencies which enable the transceiver IC to demodulate the receiver signal and to perform the channel selection in the TX part The VCO module is switched on with the signa...

Страница 14: ... LO1 2 RF GSM 1900 Transmit 512 810 1850 2 1909 8 MHz LO1 2 RF IF 80 0 MHz Synthesizer LO2 The second local oscillator LO2 consists of a PLL and VCO inside Bright D903 and an internal loop filter Due to the direct conversion receiver architecture the LO2 is only used for transmit operation The LO2 covers a frequency range of at least 16 MHz 640MHz 656MHz Before the LO2 signal gets to the modulator...

Страница 15: ... for 1800MHz 1900MHz bands are divided by 2 and by 4 for 850MHG 900MHz band Furthermore the IC includes a programmable gain baseband amplifier PGA 90 dB range 2dB steps with automatic DC offset calibration LNA and PGA are controlled via EGOLDlite signals RF_DAT RF_CLK RF_STR RF Contr N6 R6 N4 The channel filtering is realized inside the chip with a three stage baseband filter for both IQ chains On...

Страница 16: ...ed in the feedback path of the down conversion mixer With help of an offset PLL the IF signal becomes the modulated signal at the final transmit frequency Therefore the GMSK modulated rf signal at the output of the TX VCOs is mixed with the divided LO1 signal to a IF signal and sent to the phase detector The I Q modulated signal with a center frequency of the intermediate frequency is send to the ...

Страница 17: ...Company Confidential s Com Copyright 2005 Siemens AG Page 17 of 53 TD_Repair_L2 5_A70_A75_R1 0 pdf Release 1 0 6 6 Bright IC Overview BRIGHT 6E IC Overview ...

Страница 18: ...Company Confidential s Com Copyright 2005 Siemens AG Page 18 of 53 TD_Repair_L2 5_A70_A75_R1 0 pdf Release 1 0 IC top view ball overview ...

Страница 19: ...tiation between the internal and external antenna which is used only for RF adjustments on the board b The electrical antenna switch for the differentiation between the receiving and transmitting signals To activate the correct tx pathes of this diplexer the EGOLDlite signals RF_FE_DTR_GSM and RF_FE_DTR_DCS are required Internal External antenna switch to Bright External Internal to from diplexer ...

Страница 20: ...X Low Low EGSM TX high Low DCS1800 PCS1900 TX Low High Pin assignment 1 Antenna 15 PCS1900 RX1 2 GND 16 PCS1900 RX2 3 Vsw2 DCS1800 PCS1900 TX control 17 GND 4 GND 18 GND 5 DCS1800 PCS1900 TX 19 GND 6 GND 20 GND 7 GND 21 GND 8 EGSM900 TX 22 GND 9 Vsw1 EGSM900 TX control 23 GND 10 GND 24 GND 11 EGSM900 RX1 25 GND 12 EGSM900 RX2 26 GND 13 DCS1800 RX1 27 GND 14 DCS1800 RX2 28 GND ...

Страница 21: ...ated by a logic signal RF_BAND_SW TDMA Timer P10 which is provided by the EGOLDLite To ensure that the output power and burst timing fulfills the GSM specification an internal power control circuitry is use The power detect circuit consists of a sensing transistor which operates at the same current as the third RF transistor The current is a measure of the output power of the PA This signal is squ...

Страница 22: ...Company Confidential s Com Copyright 2005 Siemens AG Page 22 of 53 TD_Repair_L2 5_A70_A75_R1 0 pdf Release 1 0 7 Logic Control 7 1 Overview of Hardware Structure A70 ...

Страница 23: ...Company Confidential s Com Copyright 2005 Siemens AG Page 23 of 53 TD_Repair_L2 5_A70_A75_R1 0 pdf Release 1 0 7 2 Overview of Hardware Structure A75 ...

Страница 24: ...Company Confidential s Com Copyright 2005 Siemens AG Page 24 of 53 TD_Repair_L2 5_A70_A75_R1 0 pdf Release 1 0 7 3 EGOLDlite Blockdiagram EGOLDlite ...

Страница 25: ...nel filtering is done by a digital baseband filter in each path The DSP performs 1 The GMSK equalization of the received baseband signal 2 Channel decoding which is supported by an hardware accelerator The recovered digital speech data is fed into the speech decoder The E GOLDlite supports fullrate halfrate enhanced fullrate and adaptive multirate speech CODEC algorithms The generated voice signal...

Страница 26: ...E GOLDlite is only used as a modem then it supports High Speed Circuit Switched Data HSCSD class 10 Note With a HSCSD class 10 there are a maximum of 4 received time slots and 2 transmitted time slots The total maximum number of received and transmitted time slots is 5 Packet oriented data GPRS class 10 with a coding scheme from 1 to 4 It provides fixed dynamic and extended dynamic modes Note With...

Страница 27: ...he support with automatic stack overflow underflow detection Control Oriented Instruction Set with High Efficiency Bit byte and word data types Flexible and efficient addressing modes for high code density Enhanced boolean bit manipulation with direct addressing of 6 Kbits for peripheral control and user defined flags Hardware traps to identify exception conditions during runtime HLL support for s...

Страница 28: ...the configurable Interrupt PEC controller and debug and break logic Configurable dual port RAM Configurable Interrupt PEC controller All interfaces for system on chip integration including X Bus PD peripheral bus Local Memory bus for ROM or SRAM The C166 architecture allows instruction execution and data access from all memory locations This includes X Bus local memory bus dual port and external m...

Страница 29: ...Automatic context switching by interrupts Up to 16 bit Bit Field Operations BFO Three modes for power saving features Operational Idle and Sleep The maximum Frequency is 104 MHz The TEAKlite core clock is scalable to lower frequencies In the DSP Firmware are implemented the following functions The High Speed Circuit Switched Data HSCSD class 4 is supported The packet oriented data GPRS class 4 is ...

Страница 30: ...ite Real Time Clock integrated in the E GOLDlite The real time clock degree of accuracy 150ppm is powered via a seperate voltage regulator inside the PMU Via a capacitor data is kept in the internal RAM during a battery change for at least 30 seconds An alarm function is also integrated with which it is possible to switch the phone on and off 7 4 SRAM Memory for volatile data Memory Size A70 A75 1...

Страница 31: ...ation the Amber LEDs are mounted on a PCB on the module In addition all passive components necessary to drive an LCD are assembled on the module PCB Further the hardware coding is also implemented on the module PCB Thus the only interconnections to the Siemens PCB are the data lines and the power supply lines of the controller and the amber LEDs The interface is realised by a spring connector with...

Страница 32: ... 0 pdf Release 1 0 The voltage regulator N280 with a nominal output voltage of 2 8V is used With the signal LIGHT_LCD P1 the illumination for the display is controlled Required voltage for the display controller VEBU_2 9V The voltage regulator N308 with a nominal output voltage of 2 9V is used ...

Страница 33: ...umination Keyboard The LED s are mounted on the upper side of the PCB The illumination of the keypad will be done via high brightness LEDs colour amber type top shooter driven by 6 mA LED The light is switched via switches inside the EGOLDlite With the signal LIGHT_KB R5 the illumination for the keyboard is controlled ...

Страница 34: ... a rubber seal gasket The contact on the PCB is realised via spiral springs which are integrated in the gasket Because of usage of Unidirectional Microphone the gasket has a front and a back sound inlet hole The front sound inlet is acoustically tighten connected with a sound inlet at the rear side of the mounting frame lower part The back sound inlet is acoustically tighten connected with a sound...

Страница 35: ...own mode the current consumption of the ASIC is very low The inputs for switch on conditions Pin ON OFF ON OFF2 VDD_CHARGE the LPREG Bandgap reference and the POR cells are active All other blocks are switched off so the battery is not discharged This state is called phone off Start Up Mode ON_OFF ON_OFF2 Start Up Mode can be initiated by ON_OFF or ON_OFF2 In this mode a sequential start up of ref...

Страница 36: ...n clock and all reference voltages are active LDOs are working in low current mode The possibility to supply the ASIC from VDD_CHARGE with the internal LDO is switched off Only the battery can be used for supply This mode is called phone stand by Trickle charge mode to be able to support charging of the battery VDD_CHARGE EXT_PWR In case of a rising edge at VDD_CHARGE the ASIC goes from power down...

Страница 37: ... the watchdog The first edge of watchdog is rising If a falling edge is detected as the first transient the device will go to power down mode again and the whole phone is switched off Rising and falling edges must be detected alternated With any edge on WDOG pin a counter will be loaded The next compared to the previous edge inverted edge must occur between end of T1 and end of T2 If the signal oc...

Страница 38: ...d by SLEEP1_N and SLEEP2_N If one of them is set to high the regulator is enabled The control method can be modified by TWI interface between external and internal control mode If internal control mode is set RF1LDO can only be enabled by TWI bit In external mode RF1LDO can only be enabled by SLEEP1_N or SLEEP2_N RF1LDO is released with rising edge of POWER_ON signal Voltage Supply RF VREGRF2 RF_E...

Страница 39: ...he VDD In the case of falling slope at the CHARGE_UP the current source is switched off and the pull up resistor will make sure that the charge FET is blocked after a finite time Temperature switchoff becomes effective at approx T 60 C Voltage supervision The levels of regulator REG1 REG2 REGA SIM_LDO and also the supply voltage VBAT are supervised with comparators Supervision of REG1 and REG2 REG...

Страница 40: ...s 010001B 31H Audio mode functions Four audio amplifiers are integrated to support these modes 1 Supply the speaker in the phone with audio signals including the possibility of handsfree and antipop switch on and off This is the AUDIO MONO MODE 2 Supply the speaker in the phone with ringing signal RINGER MODE 3 Transfer a key click generated in digital part to the speaker KEY CLICK FUNCTION 4 Supp...

Страница 41: ...gnal is transferred via the amplifier to the speaker to eliminate the additional buzzer The speaker is controlled with a rectangular signal RINGIN Input signal is digital signal with variable frequency Amplitude is adjusted by TWI register For start up a smaller time constant must be used to allow a fast switch on behaviour Ringing function can be started at any time If the audio is off the start ...

Страница 42: ...lpossible operating modes the sampling frequency can vary from 8kHz to 48kHz The performance of the audio output signal must be guaranteed over the full range the human ear is able to hear This means for FS 8kHz the noise at frequencies higher than FS 2 must be suppressed This is done by DSP in a single ended 2nd order Low Pass filter The clock for the I2S will be varied accordingly to the samplin...

Страница 43: ...l of the battery whereby a disable function in the POWER SUPPLY ASIC hardware can override interrupt the charging in the case of over voltage of the battery only for Manganese Chemistry Battery types e g NEC With the new slim Lumberg IO connector we lose the charger recognition via SB line Now we measure the charge current inside the POWER SUPPLY ASIC with a current monitor The charging software i...

Страница 44: ...arging takes place is from 0 45 C Outside this range no charging takes place the battery only supplies current Trickle Charging The POWER SUPPLY ASIC is able to charge the battery at voltages below 3 2V without any support from the charge SW The current will by measured indirectly via the voltage drop over a shunt resistor and linearly regulated inside the POWER SUPPLY ASIC The current level durin...

Страница 45: ...rall Charging the battery will not be fully supported in case of using old accessory generation 45 or earlier It is not recommended to use any cables that adapt old to new Lumberg connector Using such adapters with Marlin will have at least the following impact 1 half sine wave chargers e g P35 home station can not be used for trickle charging 2 normal charging might be aborted before the battery ...

Страница 46: ...Copyright 2005 Siemens AG Page 46 of 53 TD_Repair_L2 5_A70_A75_R1 0 pdf Release 1 0 10 Interfaces 10 1Vibra XG220 Pin IN OUT Remarks 1 I BATT 2 O The FET V211 switching this signal is controlled via the EGOLDLite signal VIBRA_UC ...

Страница 47: ... 1 EPP1 O 1st connection to the internal earpiece Earpiece can be switched off in the case of accessory operation EPP1 builds together with EPN1 the differential output to drive the multifunctional earpiece earpiece ringer handsfree function 2 EPN1 O 2nd connection to the internal earpiece Earpiece can be switched off in the case of accessory operation ...

Страница 48: ...Release 1 0 10 3Microphone Pin Name IN OUT Remarks 1 MICP1 O Microphone power supply The same line carries the frequency speech signal 2 GND_MIC 10 4Battery X181 Pin Name Level Remarks 1 BATT 3 V 4 5V Positive battery pole 2 AKKU_TYP 0V 2 65V Recognition of battery supplier 3 GND Ground 4 GND Ground ...

Страница 49: ...respected on an as low as possible power consumption in the accessories 2 GND 3 TX O Serial interface 4 RX I Serial interface 5 DATA CTS I O Data line for accessory bus Use as CTS in data operation 6 RTS I O Use as RTS in data operation 7 CLK DCD I O Clock line for accessory bus Use as DTC in data operation 8 AUDIO_L Analog O driving ext left speaker With mono headset Audio_L and Audio_R different...

Страница 50: ...Z211 is a 5 channel filter with over voltage and ESD Protection array which is designed to provide filtering of undesired RF signals in the 800 4000MHz frequency band Additionally the Z211 contains diodes to protect downstream components from Electrostatic Discharge ESD voltages up to 8 kV Pin configuration of the Z211 Z211 Circuit Configuration ...

Страница 51: ...T Remarks 3 CCLK O Pulse for chipcard The chipcard is controlled directly from the EGOLDlite 2 CCRST O Reset for chipcard I 7 CCIO O Data pin for chipcard 10 kΩ pull up at the CCVCC pin 1 CCVCC Switchable power supply for chipcard 220 nF capacitors are situated close to the chipcard pins and are necessary for buffering current spikes ...

Страница 52: ...epair_L2 5_A70_A75_R1 0 pdf Release 1 0 11 Keyboard The keyboard is connected via the lines KB0 KB9 with the EGOLDlite KB 7 is used for the ON OFF switch The lines KB0 KB5 are used as output signals In the matrix KB6 KB8 and KB9 are used as input signals for the EGOLDlite ...

Страница 53: ...Company Confidential s Com Copyright 2005 Siemens AG Page 53 of 53 TD_Repair_L2 5_A70_A75_R1 0 pdf Release 1 0 ...

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