DSB75 Development Support Board Rev. B1 Hardware Description
Confidential / Released
DSB75_hd_v12
Page 5 of 96
2008-08-26
Figure 13: Recommended adapter cable from PC to COM2 on DSB75 ...............................35
Figure 14: Analog audio interface – overview.......................................................................36
Figure 15: Location of the audio connectors and switches ...................................................37
Figure 16: Siemens Car Kit Portable HKP-500.....................................................................39
Figure 17: Circuit of microphone feeding bridges .................................................................40
Figure 18: DAI interface .......................................................................................................41
Figure 19: Location and pin assignment of the DAI connector X703 ....................................41
Figure 20: Example for connecting measurement equipment...............................................42
Figure 21: USB device interface...........................................................................................43
Figure 22: Location of the USB interface, switches and jumper ...........................................44
Figure 23: I²C interface ........................................................................................................46
Figure 24: I²C interface location ...........................................................................................46
Figure 25: SD card interface ................................................................................................48
Figure 26: Location of slide switches and card reader pins ..................................................49
Figure 27: SPI interfaces......................................................................................................53
Figure 28: SPI interfaces location and related switches .......................................................54
Figure 29 PWM filter characteristics.....................................................................................55
Figure 30: Analog interface location and related switches....................................................55
Figure 31: Analog interface ..................................................................................................56
Figure 32: Power supply interfaces ......................................................................................58
Figure 33: Location of the power supply connectors, switches and jumpers.........................59
Figure 34: Input circuit schematic (5V DC/DC converter) for power supply ..........................60
Figure 35: Schematic for audio supply (5V0_I).....................................................................61
Figure 36: Schematic for GSM module supply (3V3_4V5 or BATT+) ...................................61
Figure 37: Battery screw terminal.........................................................................................63
Figure 38: Schematic of charging circuit ..............................................................................65
Figure 39: Location of jumpers and resistors for adjusting BATT+ voltage (3V3_4V5).........66
Figure 40: Location of LEDs.................................................................................................67
Figure 41: ASC signal indication circuit ................................................................................68
Figure 42: GPIO signal indication circuit...............................................................................69
Figure 43: Location, signal names and switch positions of the slide switches ......................74
Figure 44: Location of jumpers.............................................................................................76
Figure 45: Illustration of positions to cut the trace for jumpers X203 and X122 ....................76
Figure 46: Mounting GSM module (MC75, TC63, TC65) onto the DSB75............................77
Figure 47: Top view on DSB75 with connected GSM module (MC75, TC63 or TC65) and RF
cable .............................................................................................................................78
Figure 48: Turn on circuit .....................................................................................................79
Figure 49: Schematic of page signals ..................................................................................86
Figure 50: Schematic of position list.....................................................................................87
Figure 51: Schematic sheet 1 – B2B connector, test points, USB interface..........................88
Figure 52: Schematic sheet 2 – ASC0, ASC1 and ASC2 interface.......................................89
Figure 53: Schematic sheet 3 – SD card reader...................................................................90
Figure 54: Schematic sheet 4 – GPIOs, power supply .........................................................91
Figure 55: Schematic sheet 5 – SIM card, I2C, SPI, analog and antenna interface..............93
Figure 56: Schematic sheet 6 – charging interface...............................................................93
Figure 57: Schematic sheet 7 – audio interface....................................................................94
Figure 58: Floor plan top side...............................................................................................95
Figure 59: Floor plan bottom side.........................................................................................96
