DSB75 Development Support Board Rev. B1 Hardware Description
Confidential / Released
DSB75_hd_v12 Page 3 of 96 2008-08-26
Contents
0 Document History ...................................................................................................... 7
1 Introduction...............................................................................................................12
1.1 Supported Products ...........................................................................................12
1.2 Related Documents............................................................................................12
1.3 Scope of Delivery...............................................................................................13
1.3.1 Standard package DSB75 Development Support Board ......................13
1.3.2 Product specific accessories ................................................................13
1.4 Terms and Abbreviations ...................................................................................14
2 General Overview......................................................................................................16
2.1 Key Features at a Glance ..................................................................................16
2.2 System Overview ...............................................................................................18
2.3 Location of Connectors, Switches, Jumpers, LEDs, Adjustable Resistors..........19
2.4 Block Diagram....................................................................................................20
2.5 Interface Overview .............................................................................................21
3 Description of DSB75 Interfaces..............................................................................23
3.1 GSM Module Interface (Board-to-Board Connector) ..........................................23
3.2 Test Points.........................................................................................................25
3.3 GPIO Lines ........................................................................................................27
3.4 SIM Card Interface.............................................................................................29
3.5 RS-232 Interfaces ..............................................................................................31
3.5.1 Serial Interface 1 (COM1).....................................................................33
3.5.2 Serial Interface 2 (COM2).....................................................................34
3.5.3 Debug Interface (COM3) ......................................................................35
3.6 Analog Audio Interfaces.....................................................................................36
3.6.1 Audio Interface 1 (Handset)..................................................................37
3.6.2 Audio Interface 2 (Headset or Speakerphone Operation).....................38
3.6.2.1 Recommended Headset.......................................................38
3.6.2.2 Speakerphone Operation......................................................39
3.6.3 Microphone Circuit (Feeding Bridges) ..................................................40
3.7 Digital Audio Interface........................................................................................41
3.8 USB Device Interface.........................................................................................43
3.9 I²C Interface .......................................................................................................45
3.10 SD Card Interface ..............................................................................................48
3.10.1 SD 4 Bit Mode ......................................................................................50
3.10.2 SD 1 Bit Mode ......................................................................................51
3.10.3 SPI Bus Mode ......................................................................................52
3.11 Serial Peripheral Interfaces................................................................................53
3.12 Analog Interface.................................................................................................55
3.13 Antenna Interface...............................................................................................57
3.14 Power Supply Interfaces ....................................................................................58
3.14.1 Internal Supply Voltages.......................................................................60
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