Users Manual

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 4 / 82
3.7.3. Auxiliary UART Port ..................................................................................................... 41
3.7.4. UART Application ......................................................................................................... 41
3.8. Audio Interfaces .................................................................................................................... 43
3.8.1. Decrease TDD Noise and other Noise ......................................................................... 44
3.8.2. Microphone Interfaces Design ..................................................................................... 45
3.8.3. Receiver and Speaker Interface Design ...................................................................... 46
3.8.4. Earphone Interface Design .......................................................................................... 48
3.8.5. Audio Characteristics ................................................................................................... 48
3.9. PCM Interface ....................................................................................................................... 49
3.9.1. Configuration ............................................................................................................... 49
3.9.2. Timing .......................................................................................................................... 50
3.9.3. Reference Design ........................................................................................................ 51
3.9.4. AT Command ............................................................................................................... 52
3.10. SIM Card Interface ................................................................................................................ 53
3.11. SD Card Interface ................................................................................................................. 55
3.12. ADC ...................................................................................................................................... 57
3.13. Behaviors of The RI .............................................................................................................. 58
3.14. Network Status Indication ...................................................................................................... 59
3.15. RF Transmitting Signal Indication ......................................................................................... 60
4 Antenna Interface ............................................................................................................................ 63
4.1. GSM Antenna Interface ......................................................................................................... 63
4.1.1. Reference Design ........................................................................................................ 63
4.1.2. RF Output Power ......................................................................................................... 64
4.1.3. RF Receiving Sensitivity .............................................................................................. 65
4.1.4. Operating Frequencies ................................................................................................ 65
4.1.5. RF Cable Soldering ..................................................................................................... 66
4.2. Bluetooth Antenna Interface .................................................................................................. 66
5 Electrical, Reliability and Radio Characteristics .......................................................................... 69
5.1. Absolute Maximum Ratings .................................................................................................. 69
5.2. Operating Temperature ......................................................................................................... 69
5.3. Power Supply Ratings ........................................................................................................... 70
5.4. Current Consumption ............................................................................................................ 71
5.5. Electro-static Discharge ........................................................................................................ 73
6 Mechanical Dimensions..........................................................................................................
........ 75
6.1. Mechanical Dimensions of Module ....................................................................................... 75
6.2. Recommended Footprint ....................................................................................................... 77
6.3. Top View of the Module ......................................................................................................... 78
6.4. Bottom View of the Module ................................................................................................... 78
7 Storage and Manufacturing ............................................................................................................ 79
7.1. Storage.................................................................................................................................. 79
7.2. Soldering ............................................................................................................................... 80
7.3. Packaging ............................................................................................................................. 81