SIM Tech SimCom SIM340, Проектирование аппаратного обеспечения

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SIM340 Hardware Design
Contents
Contents ............................................................................................................................................3
Version history..................................................................................................................................7
1 Introduction....................................................................................................................................9
1.1 Related documents ...............................................................................................................9
1.2 Terms and abbreviations.....................................................................................................10
2 SIM340 overview.........................................................................................................................13
2.1 SIM340 key features ..........................................................................................................14
2.2 SIM340 functional diagram ...............................................................................................15
2.3 SIM340 evaluation board ...................................................................................................16
3 Application interface....................................................................................................................18
3.1 SIM340 pin description......................................................................................................18
3.2 Operating modes ................................................................................................................21
3.3 Power supply......................................................................................................................22
3.3.1 Power supply pins on the board-to-board connector ................................................24
3.3.2 Minimizing power losses..........................................................................................24
3.3.3 Monitoring power supply .........................................................................................24
3.4 Power up and power down scenarios .................................................................................24
3.4.1 Turn on SIM340 .......................................................................................................24
3.4.2 Turn off SIM340 ......................................................................................................27
3.4.3 Restart SIM340 using the PWRKEY pin .................................................................29
3.5 Power saving ......................................................................................................................30
3.5.1 Minimum functionality mode...................................................................................30
3.5.2 Sleep mode (slow clock mode).................................................................................31
3.5.3 Wake up SIM340 from SLEEP mode ......................................................................31
3.6 Summary of state transitions (except SLEEP mode) .........................................................31
3.7 RTC backup........................................................................................................................32
3.8 Serial interfaces..................................................................................................................35
3.8.1 Function of serial port & debug port supporting ......................................................36
3.8.2 Software upgrade and software debug......................................................................37
3.9 Audio interfaces .................................................................................................................39
3.9.1 Speaker interface configuration................................................................................40
3.9.2 Microphone interfaces configuration........................................................................41
3.9.3 Earphone interface configuration .............................................................................41
3.9.4 Referenced electronic characteristic.........................................................................42
3.10 Buzzer ..............................................................................................................................43
3.11 SIM card interface............................................................................................................43
3.11.1 SIM card application ..............................................................................................43
3.11.2 Design considerations for SIM card holder ............................................................45
3.12 LCD display interface ......................................................................................................48
3.13 Keypad interface ..............................................................................................................48
SIM340_HD_V3.09 18.03.2009
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