SIM900 데이터 시트보기 (PDF) - Unspecified
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SIM900 Datasheet PDF : 58 Pages
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SIM900 Hardware Design
Contents
Contents .....................................................................................................................................................................3
Version history...........................................................................................................................................................7
1 Introduction.............................................................................................................................................................8
1.1 Related Documents .......................................................................................................................................8
1.2 Terms and Abbreviations...............................................................................................................................8
2 SIM900A Overview..............................................................................................................................................13
2.1 SIM900A Key Features...............................................................................................................................13
2.2 SIM900A Functional Diagram....................................................................................................................15
2.3 SIM900A Evaluation Board........................................................................................................................16
3 Application Interface.............................................................................................................................................17
3.1 SIM900A Pin Description ...........................................................................................................................17
3.2 Operating Modes .........................................................................................................................................20
3.3 Power Supply ..............................................................................................................................................21
3.3.1 Power Supply Pins.............................................................................................................................22
3.3.2 Minimizing Power Losses .................................................................................................................23
3.3.3 Monitoring Power Supply .................................................................................................................23
3.4 Power Up and Power Down Scenarios........................................................................................................23
3.4.1 Turn on SIM900A .............................................................................................................................23
3.4.2 Turn Off SIM900A............................................................................................................................26
3.4.3 Restart SIM900A Using the PWRKEY Pin ......................................................................................28
3.5 Power Saving ..............................................................................................................................................29
3.5.1 Minimum Functionality Mode ..........................................................................................................29
3.5.2 Sleep Mode (Slow Clock Mode) .......................................................................................................29
3.5.3 Wake Up SIM900A from SLEEP Mode ...........................................................................................30
3.6 Summary of State Transitions (except SLEEP mode).................................................................................30
3.7 RTC Backup ................................................................................................................................................30
3.8 Serial Interfaces...........................................................................................................................................32
3.8.1 Function of serial port & debug port supporting ...............................................................................33
3.8.2 Software Upgrade and Software Debug ............................................................................................34
3.9 Audio Interfaces ..........................................................................................................................................35
3.9.1 Speaker Interface Configuration........................................................................................................36
3.9.2 Microphone Interfaces Configuration ...............................................................................................37
3.9.3 Earphone Interface Configuration .....................................................................................................37
3.9.4 Referenced Electronic Characteristic ................................................................................................37
3.10 SIM Card Interface....................................................................................................................................38
3.10.1 SIM Card Application .....................................................................................................................38
3.10.2 Design Considerations for SIM Card Holder ..................................................................................40
3.11 LCD Display Interface ..............................................................................................................................42
3.12 Keypad Interface .......................................................................................................................................42
SIM900_HD_V1.01
3
26.12.2009
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