EasyManuals Logo

SimCom SIM900 Hardware Design

SimCom SIM900
59 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #3 background imageLoading...
Page #3 background image
SIM900 Hardware Design
Contents
Contents .....................................................................................................................................................................3
Version history...........................................................................................................................................................7
1 Introduction.............................................................................................................................................................8
1.1 Related Documents .......................................................................................................................................8
1.2 Terms and Abbreviations...............................................................................................................................8
1.3 Safety Caution.............................................................................................................................................11
2 SIM900 Overview.................................................................................................................................................13
2.1 SIM900 Key Features..................................................................................................................................13
2.2 SIM900 Functional Diagram.......................................................................................................................15
2.3 SIM900 Evaluation Board...........................................................................................................................16
3 Application Interface.............................................................................................................................................17
3.1 SIM900 Pin Description..............................................................................................................................17
3.2 Operating Modes.........................................................................................................................................20
3.3 Power Supply ..............................................................................................................................................21
3.3.1 Power Supply Pins.............................................................................................................................23
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 SIM900 ................................................................................................................................23
3.4.2 Turn Off SIM900...............................................................................................................................26
3.4.3 Restart SIM900 Using the PWRKEY Pin .........................................................................................29
3.5 Power Saving ..............................................................................................................................................29
3.5.1 Minimum Functionality Mode ..........................................................................................................29
3.5.2 Sleep Mode (Slow Clock Mode) .......................................................................................................30
3.5.3 Wake Up SIM900 from SLEEP Mode..............................................................................................30
3.6 Summary of State Transitions (except SLEEP mode).................................................................................30
3.7 RTC Backup ................................................................................................................................................31
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
SIM900_HD_V1.05 06.23.2010
3

Table of Contents

Other manuals for SimCom SIM900

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the SimCom SIM900 and is the answer not in the manual?

SimCom SIM900 Specifications

General IconGeneral
BrandSimCom
ModelSIM900
CategoryModem
LanguageEnglish