DSB75 Development Support Board Rev. B1 Hardware Description
Confidential / Released
DSB75_hd_v12 Page 4 of 96 2008-08-26
3.14.2 Power Supply for DSB75 and GSM Module..........................................62
3.14.3 Battery Powered Operation of GSM Module.........................................63
3.14.3.1 Charging the Battery.............................................................63
3.14.3.2 Charging Circuit....................................................................64
3.14.4 Real Time Clock Supply .......................................................................65
3.14.5 Adjusting the V
BATT+
Supply Voltage for the GSM Module.....................66
4 Status LEDs...............................................................................................................67
4.1 Indication of Asynchronous Serial Interface Signals...........................................68
4.2 Indication of GPIO Signals and SYNC ...............................................................68
4.3 Indication of Power.............................................................................................69
4.4 Indication of I²C Lines ........................................................................................69
5 Overview of Switches and Jumpers ........................................................................70
5.1 Overview of Switches.........................................................................................70
5.2 Overview of Jumpers .........................................................................................75
6 Connecting Antenna and GSM Module to DSB75...................................................77
7 Turn on / off the GSM Module ..................................................................................79
7.1 Turn on the GSM Module...................................................................................79
7.2 Turn off the GSM Module...................................................................................80
7.3 Emergency Restart ............................................................................................80
8 Technical Data of DSB75..........................................................................................81
8.1 Cable Requirements ..........................................................................................84
9 Appendix....................................................................................................................85
9.1 List of Parts and Accessories.............................................................................85
9.2 Circuit Diagrams of DSB75 ................................................................................86
9.3 Floor Plan of the DSB75 ....................................................................................95
Figures
Figure 1: System overview ...................................................................................................
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Figure 2: Location of the connectors, switches, jumpers, LEDs and adjustable resistors .....
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Figure 3: Block diagram .......................................................................................................
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Figure 4: Pin assignment of the B2B connector ...................................................................
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Figure 5: Overview of B2B connector pins and the corresponding test points ......................
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Figure 6: Location of the test points .....................................................................................
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Figure 7: GPIO circuit...........................................................................................................
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Figure 8: GPIO - location of switches and LEDs...................................................................
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Figure 9: SIM card interface .................................................................................................
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Figure 10: Pin location of the Molex SIM card holder and test pins ......................................
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Figure 11: RS-232 interfaces ...............................................................................................
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Figure 12: Location of the RS-232 interfaces and switches..................................................
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