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DSB75 Development Support Board Rev. B1 Hardware Description

Strictly confidential / Released

DSB75_hd_v08 Page 4 of 94 29.09.2005

3.14.3.2 Charging Circuit.....................................................................62

3.14.4 Real Time Clock Supply.........................................................................63

3.14.5 Adjusting the V

BATT+

Supply Voltage for the GSM Module .....................64

4 Status LEDs.................................................................................................................65

4.1 Indication of Asynchronous Serial Interface Signals............................................66

4.2 Indication of GPIO Signals and SYNC.................................................................66

4.3 Indication of Power ..............................................................................................67

4.4 Indication of I²C Lines ..........................................................................................67

5 Overview of Switches and Jumpers..........................................................................68

5.1 Overview of Switches ..........................................................................................68

5.2 Overview of Jumpers ...........................................................................................73

6 Connecting Antenna and GSM Module to DSB75....................................................75

6.1 Turn on / off the GSM Module .............................................................................77

6.1.1 Turn on the GSM Module.......................................................................77

6.1.2 Turn off the GSM Module.......................................................................78

6.1.3 Emergency Restart ................................................................................78

7 Technical Data of DSB75............................................................................................79

7.1 Cable Requirements ............................................................................................82

8 Appendix......................................................................................................................83

8.1 List of Parts and Accessories ..............................................................................83

8.2 Circuit Diagrams of DSB75..................................................................................84

8.3 Floor Plan of the DSB75 ......................................................................................93

Figures

Figure 1: System overview ..................................................................................................... 16

Figure 2: Location of the connectors, switches, jumpers, LEDs and adjustable resistors......17

Figure 3: Block diagram .........................................................................................................18

Figure 4: Pin assignment of the B2B connector.....................................................................21

Figure 5: Overview of B2B connector pins and the corresponding test points.......................23

Figure 6: Location of the test points .......................................................................................23

Figure 7: GPIO circuit.............................................................................................................25

Figure 8: GPIO - location of switches and LEDs....................................................................26

Figure 9: SIM card interface...................................................................................................27

Figure 10: Pin location of the Molex SIM card holder and test pins .......................................28

Figure 11: RS-232 interfaces .................................................................................................29

Figure 12: Location of the RS-232 interfaces and switches...................................................30

Figure 13: Recommended adapter cable from PC to COM2 on DSB75 ................................ 33

Figure 14: Analog audio interface – overview ........................................................................34

Figure 15: Location of the audio connectors and switches .................................................... 35

Figure 16: Siemens Car Kit Portable HKP-500 ......................................................................37

Figure 17: Circuit of microphone feeding bridges...................................................................38

Figure 18: DAI interface .........................................................................................................39

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