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DSB75 Development Support Board Rev. B1 Hardware Description

Strictly confidential / Released

DSB75_hd_v08 Page 5 of 94 29.09.2005

Figure 19: Location of DAI connector X703 ...........................................................................39

Figure 20: Example for connecting measurement equipment................................................ 40

Figure 21: USB device interface.............................................................................................41

Figure 22: Location of the USB interface, switches and jumper.............................................42

Figure 23: I²C interface...........................................................................................................44

Figure 24: I²C interface location .............................................................................................44

Figure 25: SD card interface ..................................................................................................46

Figure 26: Location of slide switches and card reader pins ................................................... 47

Figure 27: SPI interfaces........................................................................................................51

Figure 28: SPI interfaces location and related switches.........................................................52

Figure 29 PWM filter characteristics.......................................................................................53

Figure 30: Analog interface location and related switches..................................................... 53

Figure 31: Analog interface ....................................................................................................54

Figure 32: Power supply interfaces........................................................................................56

Figure 33: Location of the power supply connectors, switches and jumpers .........................57

Figure 34: Input circuit schematic (5V DC/DC converter) for power supply ...........................58

Figure 35: Schematic for audio supply (5V0_I) ......................................................................59

Figure 36: Schematic for GSM module supply (3V3_4V5 or BATT+) ....................................59

Figure 37: Battery screw terminal...........................................................................................61

Figure 38: Schematic of charging circuit ................................................................................63

Figure 39: Location of jumpers and resistors for adjusting BATT+ voltage (3V3_4V5) .........64

Figure 40: Location of LEDs...................................................................................................65

Figure 41: ASC signal indication circuit..................................................................................66

Figure 42: GPIO signal indication circuit ................................................................................66

Figure 43: Location, signal names and switch positions of the slide switches.......................72

Figure 44: Location of jumpers...............................................................................................74

Figure 45: Illustration of positions to cut the trace for jumpers X203 and X122..................... 74

Figure 46: Mounting GSM module onto the DSB75 ...............................................................75

Figure 47: Top view on DSB75 with connected GSM module and RF cable .........................76

Figure 48: Turn on circuit .......................................................................................................77

Figure 49: Schematic of page signals ....................................................................................84

Figure 50: Schematic of position list.......................................................................................85

Figure 51: Schematic sheet 1 – B2B connector, test points, USB interface ..........................86

Figure 52: Schematic sheet 2 – ASC0, ASC1 and ASC2 interface........................................87

Figure 53: Schematic sheet 3 – SD card reader ....................................................................88

Figure 54: Schematic sheet 4 – GPIOs, power supply...........................................................89

Figure 55: Schematic sheet 5 – SIM card, I2C, SPI, analog and antenna interface .............. 90

Figure 56: Schematic sheet 6 – charging interface................................................................91

Figure 57: Schematic sheet 7 – audio interface.....................................................................92

Figure 58: Floor plan top side.................................................................................................93

Figure 59: Floor plan bottom side...........................................................................................94

Tables

Table 1: Key features .............................................................................................................14

Table 2: Interfaces of the DSB75 ...........................................................................................19

Table 3: Pin assignment of B2B connector X100...................................................................22

Table 4: Pin assignment – B2B connector X100 and test points X101..................................24

Table 5: Pin assignment – B2B connector X100 and test points X102..................................24

Table 6: LED indication of GPIO status..................................................................................25

Table 7: GPIO assignment and switch position......................................................................26

Table 8: Pin assignment – SIM card holder X503 and test pins X501 ...................................28

Table 9: Pin assignment of 1st serial interface COM1 (X201) ...............................................31

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