Siemens S55 Operator's manual

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S55/S57 Company Confidential © Copyright Siemens AG 12/02
S55/57
(Hitachi Chipset)
Level 2.5e
Repair Documentation
V 1.00
Version Date Department Notes to change
V 1.00 Dec 2002 ICM MP CCQ GRM New document

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S55/S57 Company Confidential © Copyright Siemens AG 12/02
Table of Contents:
1LIST OF AVAILABLE LEVEL 2,5E PARTS S55/S57......................................... 4
2REQUIRED EQUIPMENT FOR LEVEL 2,5E ...................................................... 5
3REQUIRED SOFTWARE FOR LEVEL 2,5E S55/S57 ........................................ 5
4RADIO PART ...................................................................................................... 6
4.1 Power Supply RF-Part .................................................................................... 7
4.2 Frequency generation .................................................................................... 8
4.2.1 Synthesizer: The discrete VCXO (26MHz)...........................................................................8
4.2.2 Synthesizer: LO1................................................................................................................10
4.2.3 Synthesizer: LO2................................................................................................................12
4.2.4 Synthesizer: PLL ................................................................................................................13
4.3 Antenna switch (electrical/mechanical)...................................................... 14
4.4 Receiver......................................................................................................... 17
4.4.1 Receiver: EGSM900/GSM1800/GSM1900 –Filter to Demodulator ...................................17
4.4.2 IC Overview ........................................................................................................................19
4.5 Transmitter.................................................................................................... 20
4.5.1 Transmitter: Modulator and Up-conversion Loop...............................................................20
4.5.2 Transmitter: Power Amplifier ..............................................................................................21
5LOGIC / CONTROL........................................................................................... 22
5.1 Overview of Hardware Structure ................................................................. 22
5.1.1 Logic Block Diagram ..........................................................................................................22
5.1.2 Block Diagram S55/S57 Control Part.................................................................................22
5.1.3 EGOLD+.............................................................................................................................23
5.1.4 SRAM .................................................................................................................................27
5.1.5 FLASH ................................................................................................................................27
5.1.6 SIM .....................................................................................................................................27
5.1.7 Vibration Motor ...................................................................................................................28
6POWER SUPPLY.............................................................................................. 28
6.1 Power Supply ASIC ...................................................................................... 28
6.1.1 Pinout diagram ...................................................................................................................29
6.1.2 Power Supply Diagram.......................................................................................................30
6.1.3 Power Supply Operating mode: .........................................................................................31
6.1.4 Power Supply Functions:....................................................................................................32
6.2 Battery ........................................................................................................... 34
6.3 Charging Concept......................................................................................... 34
7INTERFACES.................................................................................................... 38

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7.1 Vibra............................................................................................................... 38
7.2 Earpiece......................................................................................................... 38
7.3 Microphone ................................................................................................... 39
7.4 Battery ........................................................................................................... 39
7.5 IO Connector with ESD protection.............................................................. 40
7.5.1 IO Connector – New Slim Lumberg ...................................................................................40
7.5.2 ESD Protection with EMI filter ............................................................................................41
7.6 SIM ................................................................................................................. 42
7.7 Display........................................................................................................... 42
8ACOUSTIC........................................................................................................ 43
8.1 Microphone ................................................................................................... 43
8.1.1 Mechanical .........................................................................................................................43
8.1.2 Electrical .............................................................................................................................43
8.2 Soundchip ..................................................................................................... 44
8.3 Earpiece/Loudspeaker ................................................................................. 45
8.3.1 Mechanical .........................................................................................................................45
8.3.2 Electrical .............................................................................................................................45
9DISPLAY AND ILLUMINATION........................................................................ 46
9.1 Display........................................................................................................... 46
9.2 Illumination ................................................................................................... 46
10 KEYBOARD ................................................................................................... 47
11 BLUETOOTH (ONLY S55)............................................................................. 47
11.1 Bluetooth Voltage Regulator .................................................................... 48
12 IRDA............................................................................................................... 49

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S55/S57 Company Confidential © Copyright Siemens AG 12/02
1 List of available level 2,5e parts
S55/S57
ID-No Type Name, Location Part-No.
D171 IC Egold+ L36810-G6144-D670
D361 IC ASIC L36145-J4682-Y43
D400 IC Application_Processor L36820-L6117-D670
D450 IC Bluetooth_IC L36820-L6143-D670
D800 IC Transceiver IC L36820-L6105-D670
D890 VCO Transmitter_VCO L36820-L6132-D670
D920 IC PA_Comperator L36820-L6133-D670
N281 IC Volt.Regulator_Light L36810-C6106-D670
N282 IC Volt.Regulator_Light L36810-C6098-D670
N3361 IC Step-Down_Regulator L36810-C6105-D670
N450 IC Volt.Regulator_Bluetooth L36810-C6099-D670
R959 Resistor Temp_Resistor L36120-F4223-H
V151 Diode Diode_KB7 L36840-D5030-D670
V181 Diode Diode_Battery_Interface L36702-A1051
V212 Transistor Tran._Vibra_Light L36830-C1112-D670
V213 Diode Diode_SIM_Vibra L36840-D53-D670
V215 Diode Diode_IO Connector L36840-D3084-D670
V361 Transistor Tran._Charge L36830-C1110-D670
V450 Diode Diode_Bluetooth L36840-D73-D670
V850 Transistor Tran._VCO_Switch L36820-C6047-D670
V920 Diode Feedback_Diode L36840-D5049-D670
V921 Transistor Tran._PA_Switch L36820-C6047-D670
V950 Transistor Tran._26MHz_Ampl. L36840-C4049-D670
V951 Diode Capa_Diode L36840-D61-D670
Z171 Quartz Quarz/Egold L36145-F102-Y10
Z211 Filter Logic/IO_Interface L36197-F5000-F116
Z850 VCO 1LO_VCO L36145-G100-Y96
Z851 Filter Filter_BALUN L36145-K260-Y41
Z880 IC Ant_Switch_Diplexer L36145-K280-Y244
Z900 IC Power_Amplifier L36851-Z2002-A59
Z950 Quartz Oszillator_26MHz L36145-F260-Y17

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S55/S57 Company Confidential © Copyright Siemens AG 12/02
2 Required Equipment for Level 2,5e
- GSM-Tester (CMU200 or 4400S incl. Options)
- PC-incl. Monitor, Keyboard and Mouse
- Bootadapter 2000/2002 (L36880-N9241-A200)
- Adapter cable for Bootadapter due to new Lumberg connector
- Troubleshooting Frame S55/S57 (F30032-P208-A1)
- Power Supply
- Spectrum Analyser min. 4GHz
- 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
- BGA Soldering equipment
Reference: Equipment recommendation V1.2
(downloadable from the technical support page)
3 Required Software for Level 2,5e
S55/S57
- Windows NT Version4
- Winsui version1.42 or higher
- Software for GSM-Tester ( Cats(Acterna/Wiltek) or CMU-GO(Rohde&Schwarz) )
- Software for reference oscillator adjustment
- Internet unblocking solution
- Dongle driver for USB-Dongle if used with WIN NT4

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S55/S57 Company Confidential © Copyright Siemens AG 12/02
4 Radio Part
The radio part of the S55/S57, is using a Hitachi and an Infineon RF chip-set. This
manual covers the Hitachi chip-set.
The radio part is designed for Tripple Band operation, covering EGSM900, GSM1800
as well as GSM 1900 frequencies, and can be divided into 4 Blocks.
-Power supply for RF-Part
-Transmitter
-Receiver
-Synthesizer,
The RF-Part has it´s own power supply realised by a voltage regulator which is
located
inside the ASIC. The voltages for the logic part are generated by the Power-Supply
ASIC too.
The transmitter part converts the I/Q base band signals supplied by the logic
(EGOLD+) into RF-signals with characteristics as defined in the GSM
recommendation (www.etsi.org) After amplification by a power Amplifier the signal is
radiated via the internal or external antenna.
The receiver part converts the received GMSK signal supplied by the antenna into IQ
base band signals which are further processed by the logic (EGOLD+).
The synthesizer generates the required frequencies for the transmitter and receiver. A
26MHz oscillator is acting as a reference frequency.
Restrictions:
The mobile phone can never transmit and receive in both bands simultaneously. Only
the monitor time slot can be selected independently of the frequency band.
Transmitter and receiver can of course never operated simultaneously.

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4.1 Power Supply RF-Part
The voltage regulator for the RF-part is located inside the ASIC D361.(see chapter
5.2).It generates the required 2,8V “RF-Voltages” named VCC2_8 and VCC_SYN .
The voltage regulator is activated as well as deactivated via SLEEPQ (TDMA-Timer H16)
and VCXOEN_UC (Miscellaneous R6) provided by the EGOLD+. The temporary
deactivation is used to extend the stand by time.
Circuit diagram
Between Power Supply ASIC and RF-Part a resistor based interface consisting of
resistor R841 for VCC2_8 and R843 for VCC_SYN is used .
V
CC2
_
8
V
CC
_
SYN

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4.2 Frequency generation
4.2.1 Synthesizer: The discrete VCXO (26MHz)
The S55/S57 mobile is using a reference frequency of 26MHz for the Hitachi chip set.
The generation of the 26MHz signal is done via a discrete “Colpitts” VCXO. This
oscillator consists mainly of:
A 26MHz crystal Z950
An oscillator switch V950
A capacity diode V951
TP (test point) of the 26MHz signal is the TP 1501
The oscillator output signal 26MHz_RF is directly connected to the BRIGHT IC (pin
38) to be used as reference frequency inside the Bright (PLL). The signal leaves the
Bright IC as BB_SIN26M at (pin 36) to be further used from
the EGOLD+ (D100 (functional T3)).
To compensate frequency drifts (e.g. caused by temperature) the oscillator frequency
is controlled by the (AFC) signal, generated through the internal EGOLD+ (D100
(functional U5)) PLL via the capacity diode V951. Reference for the “EGOLD-PLL” is the
base station frequency. To compensate a temperature caused frequency drift, the
temperature-depending resistor R959 is placed near the VCXO to measure the
temperature. The measurement result TVCXO is reported to the EGOLD+(Analog
Interface P3) via R138 as the signal TENV.
The required voltage VCC_SYN is provided by the ASCI D361
Bright 4

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Circuit diagram
from EGOLD
to Bright IC

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4.2.2 Synthesizer: LO1
The first local oscillator is needed to generate frequencies which enables the
transceiver IC to demodulate the receiver signal and to perform the channel selection
in the TX part. To do so, a control voltage for the LO1 is used. Gained by a
comparator. (located inside the Transceiver (Bright -IC)). This control voltage is a
result of the comparison of the divided LO1 and the 26MHz reference Signal. The
division ratio of the dividers is programmed by the EGOLD+, according to the network
channel requirements.
The first local oscillator (LO1) consists of the PLL inside the Bright (D800), an
external loop filter and the VCO (Z850) module. This LO1 circuit generates
frequencies from
3700-3980 MHz for EGSM900
3580-3760 MHz for GSM1800
3860-3980 MHz for GSM1900
Formula to calculate the TX frequencies:
EGSM900
Channel: 975...1023/76...92 = (Channel freq. + 82MHz) * 4
Channel: 0…75/93…124 = (Channel freq. + 80MHz) * 4
GSM1800
Channel: 512...661 = (Channel freq. - 80MHz) * 2
Channel: 662…885 = (Channel freq. - 82MHz) * 2
GSM1900
Channel: 512...810 = (Channel freq. – 80MHz) * 2
Formula to calculate the RX frequencies:
EGSM900 = Channel freq. * 4
GSM1800 = Channel freq. * 2
GSM1900 = Channel freq. * 2
26MHz

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The VCO (Z850) is switched on by the EGOLD+ signal PLLON (TDMA-Timer F16) via
V850 and therefore supplied with VCC2_8. The VCO guarantees by using the control
voltage at pin5 a coverage of the EGSM900, GSM1800 and GSM1900 frequency
band and frequency stability. The Bright gained control voltage passes on the way to
the VCO a discreet loop filter (typical value from 0,5 – 2,1V).
The channel programming of the PLL happens via the EGOLD+ signals RFDATA;
RFCLK; RFSTR. (RF Control J15, J16, J17). If the Bright IC gets via the same signals a
GSM1800 channel information, the VCO is switched to this frequency by Pin 42 Bright
(Pin 3 VCO).
For GSM900 - RX= “low signal” for Channel 975-49 “high signal” for channel 50-
124
- TX= “high signal” for all channels
For GSM1800 - RX= “low signal” for all channels
- TX= “low signal” for all channels
For GSM1900 - RX= “low signal” for all channels
- TX= “low signal” for all channels
The VCO output signal passes the “Balun” transformer (Z851) with insertion losses of
~ 2dB to arrive at the Bright IC.
The required voltage VCC8_8 is provided by the ASIC D361
Circuit diagram
Balun transformer
from EGOLD+
26MHz
Bright 4

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VCO
4.2.3 Synthesizer: LO2
The second local oscillator is required for transmitter operations only. It consists of a
PLL and a VCO which are integrated inside the Bright 4, and an external second order
loopfilter (R831; C830; C832). Before the VCO generated 640 or 656MHz signal
arrives at the modulator, it is divided by 8. So the resulting frequency after the IQ
modulator is 80/82MHz (depending on channel and band). Programming of the LO2
PLL is done in the same way as described at the LO1. The tree-wire-bus (EGOLD+
signals RFDATA; RFCLK; RFSTR. (RF Control J15, J16, J17) is used. To ensure the
frequency stability, the 640MHz VCO signal is compared by the phase detector of the
2nd PLL with the 26MHz reference signal. The resulting control signal passes the
external loop filter and is used to control the 640/656MHz VCO.
The required voltage VCC_SYN is provided by the ASIC D361
Circuit diagram
Loop-filter LO2
TOP
View

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4.2.4 Synthesizer: PLL
PLL as a part of the BRIGHT IC
Blockdiagram

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4.3 Antenna switch (electrical/mechanical)
Internal/External <> EGSM900/GSM1800/GSM1900 <> Receiver/Transmitter
The S55/S57 mobile has two antenna switches.
a) The mechanical antenna switch for the differentiation between the internal and
external antenna
b) The electrical antenna switch, for the differentiation between the receiving and
transmitting signals.
To activate the correct settings of this diplexer, the EGOLD+ signals RF_SW
and TXON_GSM are required
As a new feature the S55/S57 has an integrated “SAR detection” circuit. This circuit is
used to decide if the internal antenna or an external antenna is used. The goal is, to
reduce the transmit power when the internal antenna is used and the mobile is held
very close to the body. On the other hand, the mobile can send with more power, if the
external antenna is used. This distinction is done by the SAR detection circuit which
consists of the voltage divider R872 and R873. The ANT_DET output provides a high
level when the external antenna is used. ANT_DET (Serial Interface L16) is connected to
the EGOLD+. Required voltage is VCC_ANT_DET (VCC2_8 via R892)
a) Internal/External antenna switch
to / from
di
p
lexe
r
Internal
to EGOLD
External
Sheet 1
near TXVCO

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b) The electrical antenna switch
to
Bright
to Antenna

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Z880
Top View

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4.4 Receiver
4.4.1 Receiver: EGSM900/GSM1800/GSM1900 –Filter to Demodulator
From the antenna switch, up to the demodulator the received signal passes the
following blocks to get the demodulated baseband signals for the EGOLD+:
Z880 Bright Bright Bright
Filter: The EGSM900, GSM1800 and GSM 1900 filters are located inside the frontend
module. The Filter are centred to a frequency of 942,5MHz for EGSM900, 1847,5MHz
for GSM1800 and 1960MHZ for GSM1900. The symmetrical filter output is matched
via LC-Combinations to the LNA input of the BRIGHT (D800)
LNA: The 2 LNA´s (EGSM900/GSM1800/GSM1900) are located inside the BRIGHT
and are able to perform an amplification of ~ 20dB. The LNA can be switched in HIGH
(On) and LOW (Off) mode and is controlled by the Bright depending on EGOLD+
information.
Demodulator: The Bright IC performs a direct demodulation of the received GSM
signals. To do so the LO1 is required. The channel depending LO1 frequencies for
1800MHz/1900MHz bands are divided by 2 and by 4 for 900MHz band, Bright
internally.
PGC: After demodulation the “I” and “Q” signals are amplified by the PGC-Amplifier
the “I” and the “Q” path are amplified independently from each other. The performance
of this PGC is 80dB (-26 up to 54dB), switchable in steps of 2dB. The control is
realised through the EGOLD+ signals (RFDATA; RFCLK; RFSTR.(RF Control J15, J16,
J17). After passing a Bright internal switch (necessary because of the double using of
RX and TX lines), the signals are ready for further processing through the EGAIM
(part of the EGOLD+) The post-switched logic measures the level of the demodulated
baseband signal an regulates the level to a defined value by varying the PGA-
Amplification and switching the appropriate LNA gains
The required voltage VCC_SYN is provided by the ASIC D361
Filter LNA PGC
De-
modulator

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Circuit diagram
from LO1
to EGOLD+
progr. signals
from
antenna

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4.4.2 IC Overview
IC Overview
BRIGHT IV

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4.5 Transmitter
4.5.1 Transmitter: Modulator and Up-conversion Loop
The modulation is based on the principle of the “up-conversion modulation phase
locked loop” and is accomplished via the BRIGHT IC(D800). An internal TX IF-LO
provides the quadratic modulator with the TX IF frequency of 80/82 MHz by
generating 640/656MHz divided by 8. This so generated IF GMSK RF signal is
compared in a phase detector with the down mixed GMSK RF output from the TX-
VCO (Z150). To get the comparison signal, PCN_PA_IN (for GSM1800/GSM1900),
and GSM_PA_IN (for EGSM900) appearing at Pin 9/7 of the (D150) are mixed with
the LO1 signal (divided by 2 for GSM1800/GSM1900 and 4 for EGSM900). The output
(PLLOUT) signal of the phase detector passes a discrete loop filter realised by
capacitors and resistors to set the TXVCO to required frequency. The large loop band
width (~1,5MHz) guarantees that the regulating process is considerably quicker than
the changes in the modulation signal.
The required voltage VCC_SYN and VCC2_8 is provided by the ASIC D361
to PA
from EGOLD+
LO1