SimCom SIM800C Hardware Design page 4

4.8.2. SIM Card Design Guide...................................................................................................................... 32
4.8.3. Design Considerations for SIM Card Holder ...................................................................................... 32
4.9. ADC ....................................................................................................................................34
4.10. Network Status Indication...................................................................................................35
4.10.1. NETLIGHT Multiplexing Function................................................................................................. 35
4.11. Operating Status Indication.................................................................................................36
4.11.1. STATUS Multiplexing Function ...................................................................................................... 36
4.12. RF Synchronization Signal .................................................................................................36
4.12.1. RF_SYNC Multiplexing Function................................................................................................... 36
4.13. Antenna Interface................................................................................................................37
4.13.1 GSM Antenna Interface ................................................................................................................... 37
4.13.2 Bluetooth Antenna Interface ............................................................................................................ 38
5. PCB Layout ........................................................................................................ 39
5.1 Pin Assignment ...................................................................................................................39
5.2 Principle of PCB Layout .....................................................................................................39
5.2.1 Antenna Interface ................................................................................................................................ 40
5.2.2 Power Supply ...................................................................................................................................... 40
5.2.3 SIM Card Interface.............................................................................................................................. 40
5.2.4 Audio Interface.................................................................................................................................... 40
5.2.5 Others .................................................................................................................................................. 40
6. Electrical, Reliability and Radio Characteristics ........................................... 41
6.1 Absolute Maximum Ratings ...............................................................................................41
6.2 Recommended Operating Conditions .................................................................................41
6.3 Digital Interface Characteristics..........................................................................................41
6.4 SIM Card Interface Characteristics.....................................................................................41
6.5 SIM_VDD Characteristics ..................................................................................................42
6.6 VDD_EXT Characteristics .................................................................................................42
6.7 VRTC Characteristics .........................................................................................................42
6.8 Current Consumption (VBAT=4.0V) .................................................................................42
6.9 Electro-Static Discharge .....................................................................................................43
6.10 Radio Characteristics ..........................................................................................................44
6.10.1 Module RF Output Power................................................................................................................ 44
6.10.2 Module RF Receive Sensitivity ....................................................................................................... 45
6.10.3 Module Operating Frequencies........................................................................................................ 45
7. Manufacturing ................................................................................................... 46
7.1. Top and Bottom View of SIM800C....................................................................................46
7.2. Typical Solder Reflow Profile ............................................................................................46
7.3. The Moisture Sensitivity Level...........................................................................................47
7.4. Baking Requirements..........................................................................................................47
8. Appendix............................................................................................................. 48
I. Related Documents .............................................................................................................48
II. Multiplexing Function.........................................................................................................49
SIM800C_Hardware_Design_V1.02
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Smart Machine Smart Decision
2015-4-27