Siemens C75 Schematic

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Service Repair Documentation

Level 2.5e – C75

Release Date Department Notes to change

1.0 05.08.2005 ICM MP CCQ GRM T New document

Service Repair Documentation Level 2.5e – C75

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Table of Contents:

1 List of available level 2,5e parts C75 4 2 Required Equipment for Level 2,5e 5 3 Required Software for Level 2,5e 5 4 Radio Part 6

4.1 BLOCK DIAGRAM RF PART 7

4.2 POWER SUPPLY RF-PART 7

4.3 FREQUENCY GENERATION 8

4.4 RECEIVER 11

4.5 TRANSMITTER 12

4.6 BRIGHT IC OVERVIEW 13

4.7 ANTENNA SWITCH (ELECTRICAL/MECHANICAL) 15

4.8 TRANSMITTER: POWER AMPLIFIER 17

5 Logic / Control 18

5.1 OVERVIEW HARDWARE STRUCTURE C75 18

5.2 SGOLDLITE 18

5.2.1 Digital Baseband 18

5.2.2 SDRAM 22

5.2.3 FLASH 23

5.2.4 SIM 23

5.2.5 Vibration Motor 23

5.2.6 Camera 23

5.2.7 Display 23

5.2.8 Camera, Display ASIC 24

6 IRDA 24 7 Power Supply 25

7.1 ASIC MOZART / TWIGO4 25

7.1.1 Battery 25

7.1.2 Charging Concept 25

8 Illumination 28 9 Interfaces 29

9.1 MICROPHONE (XG1901) 29

9.2 LOUDSPEAKER (XG1702-XG1703) 30

9.3 BATTERY (X1400) 30

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CAMERA SOCKET (X3651) 31

9.4

9.5 IRDA (V2650) 32

9.6 INTERFACE SIM MODULE 32

9.7 IO CONNECTOR WITH ESD PROTECTION 33

9.8 VIBRATION MOTOR (XG2100) 36

9.9 DISPLAY 36

9.10 BOARD TO BOARD CONNECTOR 37

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1 List of available level 2,5e parts C75

(according to Component Matrix V1.06 - check C-market for updates)

Product

C75 HIT C1329 L36344-F1225-M12 CAPACITOR 2*2U2 (Cap-Type7) C75 HIT C1330 L36344-F1225-M12 CAPACITOR 2*2U2 (Cap-Type7) C75 HIT C1332 L36344-F1225-M12 CAPACITOR 2*2U2 (Cap-Type7) C75 HIT C1363 L36377-F6225-M CAPACITOR 2U2 (Cap-Type4) C75 HIT D1000 L50610-G6196-D670 IC SGOLDLITE PMB8875 V1X PB-FREE C75 HIT D1300

C75 HIT D3601 L50620-U6053-D670 IC CAMERA INTERFACE S1D13716B02 PB FREE C75 HIT D902 C75 HIT D903 L50620-L6170-D670 IC TRANCEIVER HD155165BP PB Free C75 HIT L1300 L36140-F2100-Y6 COIL 0603 (Co-Type4) C75 HIT L1301 L36151-F5103-M3 COIL 10U (Co-Type1) C75 HIT L1302 L36151-F5472-M1 COIL 4U7 (Co-Type3) C75 HIT L1303 L50640-F100-Y10 COIL 1206 (Co-Type5) C75 HIT L1318 L36140-F2100-Y6 COIL 0603 (Co-Type4) C75 HIT L1331 L36140-F2100-Y6 COIL 0603 (Co-Type4) C75 HIT N1501 L36810-B6132-D670 IC LOGIC DUAL BUS SWITCH US8 C75 HIT N3600 L506810-C6153-D670 IC ANA RE 2.9V USMD5 PB FREE C75 HIT N901 L50651-Z2002-A82 IC MODUL PA PF0814 (PA-Type2) C75 HIT R955 L36120-F4223-H RESISTOR TEMP 22K (Res-Type7) C75 HIT V1305 L36830-C1107-D670 TRANSISTOR SI5933 (Tra-Type2) C75 HIT V1400 L36840-D66-D670 DIODE BAV99T (Di-Type5) C75 HIT V1500 L36840-C4057-D670 TRANSISTOR EMD12 EMT6 (Tra-Type8) C75 HIT V1605 L36840-D3088-D670 DIODE SC89 (Di-Type2) C75 HIT V2100 L50640-D5084-D670 DIODE RB548W (Di-Type8) C75 HIT V2302 L36840-C4014-D670 TRANSISTOR BC847BS BC846S (Tra-Type7) C75 HIT V2821 L36830-C1112-D670 TRANSISTOR SI1902 (Tra-Type4) C75 HIT V950 L36840-D61-D670 DIODE 1SV305 (Di-Type4) C75 HIT Z1000 L50645-F102-Y40 QUARZ 32,768KHZ (Q-Type4) C75 HIT Z1500 L50620-L6151-D670 FILTER EMI (Fi-Type5) PB Free C75 HIT Z950 L36145-F260-Y17 QUARZ 26MHZ (Q-Type4)

Chipset

ID Order Number Description CM

L50645-J4683-Y22 L50645-K80-Y308

IC ASIC D1094ED-MOZART+ TWIGO4+

IC FEM MURATA GSM900 1800 1900 (Fem-Type6)

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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 (F30032-P226-A1)

- Troubleshooting Frame A62/A65(C75/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

- BGA Soldering equipment

Reference: Equipment recommendation V1.6 (downloadable from the technical support page)

3 Required Software for Level 2,5e

- Windows XP

- X-Focus version XX or higher

- GRT Version 3 or higher

- Internet unblocking solution (JPICS)

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4 Radio Part

The radio part is realizes the conversion of the GMSK-HF-signals from the antenna to the baseband and vice versa.

In the receiving direction, the signals are split in the I- and Q-component and led to the D/Aconverter of the logic part. In the transmission direction, the GMSK-signal is generated in an Up Conversion Modulation Phase Locked Loop by modulation of the I- and Q-signals which were generated in the logic part. After that the signals are amplified in the power amplifier.

Transmitter and Receiver are never active at the same time. Simultaneous receiving in the EGSM900 and GSM1800 band is impossible. Simultaneous transmission 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 10.

The RF-circuit consists of the following components:

• Hitachi Bright 6E chip set (HD155165BP) with the following functionality:

o PLL for local oscillator LO1 and LO2 and TxVCO o Integrated local oscillators LO1, LO2 o Integrated TxVCO o Direct conversion receiver including LNA, DC-mixer, channel filtering and

PGC-amplifier

o 26 MHz reference oscillator

• Transmitter power amplifier with integrated power control circuitry

• Frontend-Module including RX-/TX-switch and EGSM900 / DCS1800 / PCS 1900

receiver SAW-filters

• Quartz and passive circuitry of the 26MHz VCXO reference oscillator

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4.1 Block diagram RF part

4.2 Power Supply RF-Part

The voltage regulator for the RF-part is located inside the ASIC D1300. It generates the required 2,8V “RF-Voltages” named VDD_RF1 and VDD_RF2. VDD_RF2 is passed via a 0Ω resistor and renamed as VDD_BRIGHT as operating voltage for the BRIGHT. The voltage regulator is activated as well as deactivated via VCXOEN_UC

SGOLDlite. The temporary deactivation is used to extend the stand by time.

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(Functional F23) provided by the

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4.3 Frequency generation

The C75 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 oscillator output signal 26MHz_RF is directly connected to the BRIGHT IC used as reference frequency inside the Bright (PLL). The signal leaves the Bright IC as

RF_SIN26M

Bright 6E

(ball G9) to be further used from the SGOLDlite (D1000 (Functional AE15)).

VCXO Out

SGOLDlite In

To compensate frequency drifts (e.g. caused by temperature) the oscillator frequency is controlled by the (RF_AFC) signal, generated through the internal SGOLDlite (D1000 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 D1300

Waveform of the AFC_PNM signal from SGOLDlite to Oscillator

Signalform

(ball B9) to be

(A10))

SGOL Dlite

RF_AFC

Service Repair Documentation Level 2.5e – C75

1 2 3

AFC_PNM

GND

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Synthesizer: LO1 First local oscillator (LO1) consists of a PLL and VCO inside Bright (D903) and an internal

loop filter RF PLL

The frequency-step is 400 kHz in GSM1800 mode and 800kHz in EGSM900 mode due to the internal divider by two for GSM1800 and divider by four for EGSM900. To achieve the required settling-time in GPRS operation, the PLL can operate in fastlock-mode a certain period after programming to ensure a fast settling. After 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 signal PLLON. The full oscillation range is divided into 256 sub-bands To do so, a control voltage for the LO1 is used, gained by a comparator. 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 SGOLDlite, according to the network channel requirements.

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Matrix to calculate the TX and RX frequencies C75:

Band RX / TX Channels RF frequencies LO1 frequency IF freq.

EGSM 900 Receive: 0..124 935,0 - 959,8 MHz LO1 = 4*RF EGSM 900 Transmit: 0..124 890,0 - 914,8 MHz LO1 = 4*(RF+IF) 80,0 MHz

EGSM 900 Receive: 975..1023 925,2 - 934,8 MHz LO1 = 4*RF EGSM 900 Transmit: 975..1023 880,2 - 889,8 MHz LO1 = 4*(RF+IF) 82,0 MHz GSM 1800 Receive: 512..661 1805,2 - 1835,0 MHz LO1 = 2*RF GSM 1800 Transmit: 512..661 1710,2 - 1740,0 MHz LO1 = 2*(RF+IF) 80,0 MHz

GSM 1800 Receive: 661..885 1835,0 - 1879,8 MHz LO1 = 2*RF GSM 1800 Transmit: 661..885 1740,0 - 1784,8 MHz LO1 = 2*(RF+IF) 82,0 MHz

GSM 1900 Receive: 512..810 1930,2 - 1989,8 MHz 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 it is divided by 8. So the resulting TX-IF frequencies are 80/82 MHz (dependent on the channel and band). The LO2 PLL and powerup of the VCO is controlled via the tree-wire-bus of Bright (SGOLDlite signals RF_DAT;

RF_CLK; RF_STR). To ensure the frequency stability, the 640MHz VCO signal is compared

by the phase detector of the 2

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 VDD_BRIGHT is provided by the ASIC D1300

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4.4 Receiver

Receiver: Filter to Demodulator The band filters are located inside the frontend module (D902). The filters are centred to the

band frequencies. The symmetrical filter output is matched to the LNA input of the Bright .The Bright 6E incorporates three RF LNAs for GSM850/EGSM900, GSM1800 and GSM1900 operation. The LNA/mixer can be switched in High- and Low-mode to perform an amplification of ~ 20dB. For the “High Gain“ state the mixers are optimised to conversion gain and noise figure, in the “Low Gain“ state the mixers are optimised to large-signal behavior for operation at a high input level. The Bright performs a direct conversion mixers which are IQdemodulators. For the demodulation of the received GSM signals the LO1 is required. The channel depending LO1 frequencies 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 SGOLDlite signals RF_DAT; RF_CLK; RF_STR channel-filtering is realized inside the chip with a three stage baseband filter for both IQ chains. Only two capacitors which are part of the first passive RC-filters are external. The second and third filters are active filters and are fully integrated. The IQ receive signals are fed into the A/D converters in the EGAIM part of SGOLDlite. The post-switched logic measures the level of the demodulated baseband signal and regulates the level to a defined value by varying the PGA amplification and switching the appropriate LNA gains.

From the antenna switch, up to the demodulator the received signal passes the following blocks to get the demodulated baseband signals for the SGOLDlite:

Filter

LNA

Demodulator

PGC

D903 Bright(D903)

The required voltage VDD_BRIGHT is provided by the ASIC D1300

(RF CTRL B10, C8, B12). The

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4.5 Transmitter

Transmitter: Modulator and Up-conversion Loop The generation of the GMSK-modulated signal in Bright (D903) is based on the principle of

up conversion modulation phase locked loop. The incoming IQ-signals from the baseband are mixed with the divided LO2-signal. The modulator is followed by a lowpass filter (corner frequency ~80 MHz) which is necessary to attenuate RF harmonics generated by the modulator. A similar filter is used 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 phase detector as well. The output signal of the phase detector controls the TxVCO and is processed by a loop filter whose components are external to the Bright. The TxVCO which is realized inside the Bright chip generates the GSMK modulated frequency.

Modulator

Bright(D903)

The required voltage VDD_BRIGHT is provided by the ASIC D1300

Filter

TxVCO

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