Smart Machine Smart Decision
SIM808_Hardware Design_V1.00 2014.03.27
3
Contents
Contents.................................................................................................................................................................... 3
Version History........................................................................................................................................................ 9
1 Introduction..................................................................................................................................................... 10
2 SIM808 Overview ........................................................................................................................................... 10
2.1 SIM808 Key Features............................................................................................................................. 10
2.2 Operating Modes .................................................................................................................................... 13
2.3 SIM808 Functional Diagram .................................................................................................................. 14
3 Package Information ...................................................................................................................................... 15
3.1 Pin out Diagram...................................................................................................................................... 15
3.2 Pin Description ....................................................................................................................................... 16
3.3 Package Dimensions............................................................................................................................... 18
4 GSM Application Interface............................................................................................................................ 20
4.1 Power Supply.......................................................................................................................................... 20
4.1.1 Power Supply Pin................................................................................................................................ 21
4.1.2 Monitoring Power Supply ................................................................................................................... 22
4.2 Power on/down SIM808......................................................................................................................... 22
4.2.1 Power on SIM808 ............................................................................................................................... 22
4.2.2 Power down SIM808........................................................................................................................... 24
4.2.3 Reset Function..................................................................................................................................... 25
4.3 Power Saving Mode................................................................................................................................ 26
4.3.1 Function Mode .................................................................................................................................... 27
4.3.2 Sleep Mode (AT+CSCLK=1) ............................................................................................................. 27
4.3.3 Wake Up SIM808 from Sleep Mode (AT+CSCLK=1) ...................................................................... 27
4.4 Charging Interface .................................................................................................................................. 28
4.4.1 Battery Pack Characteristics................................................................................................................ 28
4.4.2 Recommended Battery Pack ............................................................................................................... 28
4.4.3 Implemented Charging Technique ...................................................................................................... 29
4.4.4 Operating Modes during Charging...................................................................................................... 29
4.4.5 Charger Requirements......................................................................................................................... 30
4.5 RTC Backup ........................................................................................................................................... 30
4.6 Serial Port and USB Interface ................................................................................................................ 31
4.6.1 Function of Serial Port ........................................................................................................................ 32
4.6.2 Serial Port............................................................................................................................................ 32
4.6.3 USB Interface...................................................................................................................................... 34
4.6.4 Software Upgrade and Debug ............................................................................................................. 35
4.7 RI Behaviors........................................................................................................................................... 35
4.8 Audio Interfaces ..................................................................................................................................... 36
4.8.1 Speaker Interface Configuration ......................................................................................................... 37
4.8.2 Microphone Interfaces Configuration ................................................................................................. 37
4.8.3 Audio Electronic Characteristics......................................................................................................... 38
4.8.4 TDD .................................................................................................................................................... 38
4.9 Bluetooth ................................................................................................................................................ 39
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