Sim800 hardware design v1.05

Smart Machine Smart Decision
SIM800_Hardware Design_V1.05 4 2014-03-25
4.10.4. SD Card Interface ............................................................................................................................ 44
4.11. Keypad Interface .................................................................................................................................... 44
4.12. I2C BUS ................................................................................................................................................. 47
4.13. General Purpose Input/Output (GPIO) ................................................................................................... 47
4.14. ADC........................................................................................................................................................ 48
4.15. PWM ...................................................................................................................................................... 48
4.16. Network Status Indication ...................................................................................................................... 49
4.17. Operating Status Indication .................................................................................................................... 50
4.18. KPLED ................................................................................................................................................... 50
4.19. RF Synchronization Signal..................................................................................................................... 51
4.20. Antenna Interface ................................................................................................................................... 51
4.20.1. GSM Antenna Interface ................................................................................................................... 52
4.20.2. Bluetooth Antenna Interface ............................................................................................................ 52
5. PCB Layout.................................................................................................................................................. 54
5.1 PIN Assignment...................................................................................................................................... 54
5.2 Principle of PCB Layout......................................................................................................................... 54
5.2.1 Antenna ............................................................................................................................................... 54
5.2.2. Power Supply ...................................................................................................................................... 54
5.2.3 SIM Card Interface.............................................................................................................................. 54
5.2.4 Audio Interface.................................................................................................................................... 55
5.2.5 Others .................................................................................................................................................. 55
6. Electrical, Reliability and Radio Characteristics ..................................................................................... 56
6.1 Absolute Maximum Ratings................................................................................................................... 56
6.2 Recommended Operating Conditions..................................................................................................... 56
6.3 Digital Interface Characteristics ............................................................................................................. 56
6.4 SIM Card Interface Characteristics ........................................................................................................ 57
6.5 SIM_VDD Characteristics...................................................................................................................... 57
6.6 VDD_EXT Characteristics ..................................................................................................................... 57
6.7 VRTC Characteristics............................................................................................................................. 57
6.8 Current Consumption (VBAT=4V)........................................................................................................ 58
6.9 Electro-Static Discharge ......................................................................................................................... 59
6.10 Radio Characteristics.............................................................................................................................. 59
6.11 Module RF Receive Sensitivity.............................................................................................................. 60
6.12 Module Operating Frequencies .............................................................................................................. 60
7. Manufacturing ............................................................................................................................................. 61
7.1. Top and Bottom View of SIM800.......................................................................................................... 61
7.2. Typical Solder Reflow Profile................................................................................................................ 61
7.3. The Moisture Sensitivity Level .............................................................................................................. 62
7.4. Baking Requirements ............................................................................................................................. 62
8. Appendix ...................................................................................................................................................... 63
I. Related Documents................................................................................................................................. 63
II. Multiplex Function ................................................................................................................................. 64
III. Terms and Abbreviations ........................................................................................................................ 65
IV. Safety Caution ........................................................................................................................................ 67