SIM Tech SIMCom SIM868 Series - Page 4

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SIM868_Series_Hardware_Design_V1.06 3 2017-07-13
5.12. Network Status Indication ................................................................................................... 42
5.13. Operating Status Indication ................................................................................................. 42
5.14. RF Synchronization Signal ................................................................................................. 43
5.15. Antenna Interface of GSM .................................................................................................. 43
5.16. Bluetooth Antenna Interface ............................................................................................... 45
5.17. Bluetooth Low Energy (BLE) ............................................................................................. 45
6. Application Interface of GNSS ......................................................................... 47
6.1. GNSS Overview .................................................................................................................. 47
6.2. Power Supply of GNSS....................................................................................................... 47
6.3. Backup Power of GNSS ...................................................................................................... 47
6.4. Power on/off GNSS ............................................................................................................ 48
6.5. Serial Port of GNSS ............................................................................................................ 49
6.6. Software Upgrade of GNSS ................................................................................................ 50
6.7. 1PPS Output ........................................................................................................................ 50
6.8. Antenna Interface ................................................................................................................ 51
6.8.1. Passive Antenna .................................................................................................................................. 51
6.8.2. Active Antenna .................................................................................................................................... 52
6.9. Operation Modes of GNSS ................................................................................................. 52
6.10. A-GPS ................................................................................................................................. 54
6.10.1. Easy Mode ....................................................................................................................................... 54
6.10.2. EPO .................................................................................................................................................. 54
6.11. Fast-Fix ............................................................................................................................... 54
6.12. Multi-tone AIC .................................................................................................................... 55
6.13. SBAS ................................................................................................................................... 55
7. PCB Layout ........................................................................................................ 56
7.1. Pin Assignment ................................................................................................................... 56
7.2. Principle of PCB Layout ..................................................................................................... 57
7.2.1. Antenna Interface ................................................................................................................................ 57
7.2.2. Power Supply ...................................................................................................................................... 57
7.2.3. SIM Card Interface .............................................................................................................................. 57
7.2.4. Audio Interface .................................................................................................................................... 57
8. Electrical, Reliability and Radio Characteristics ........................................... 58
8.1. Absolute Maximum Ratings ............................................................................................... 58
8.2. Recommended Operating Conditions ................................................................................. 58
8.3. Digital Interface Characteristics .......................................................................................... 58
8.4. SIM Card Interface Characteristics ..................................................................................... 59
8.5. SIM_VDD Characteristics .................................................................................................. 59
8.6. VDD_EXT Characteristics.................................................................................................. 59
8.7. Current Consumption（GSM_VBAT=4.0V） ................................................................... 59
8.8. Electro-Static Discharge ...................................................................................................... 60
8.9. Radio Characteristics .......................................................................................................... 61
8.9.1. Module RF Output Power ................................................................................................................... 61
8.9.2. Module RF Receive Sensitivity ........................................................................................................... 62
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