3.6.4 Serial Port Application Circuit ..................................................................................................................................................... 29
3.7 USIM Interface .............................................................................................................................. 31
3.7.1 USIM Card Reference Circuit .......................................................................................................................................................... 31
3.8 General Purpose GPIO Interface ............................................................................................. 32
3.9 Network Status Indication Interface ..................................................................................... 33
3.9.1 Network Status .............................................................................................................................................................................................. 33
3.9.2 Module Status Indication .................................................................................................................................................................. 35
3.10 I2S Interface ................................................................................................................................ 36
3.11 I2C Bus ........................................................................................................................................... 36
3.12 SWD Interface ............................................................................................................................. 37
3.13 ADC Interface .............................................................................................................................. 37
3.14 Antenna ........................................................................................................................................ 38
3.14.1 RF Trace Reference ............................................................................................................................................................................. 40
3.14.2 RF Connector Size .................................................................................................................................................................................. 42
3.15 Control Interface ....................................................................................................................... 44
3.16 GNSS Interface ........................................................................................................................... 44
3.17 SPI Interface ................................................................................................................................ 46
4 Overall Technical Indicators ......................................................................................................... 47
4.1 Chapter Overview ........................................................................................................................ 47
4.2 Working Frequency .................................................................................................................... 47
4.3 GNSS Performances ................................................................................................................... 48
4.4 Antenna Requirements .............................................................................................................. 49
5 Interface Electrical Characteristics ............................................................................................ 50
5.1 Chapter Overview ........................................................................................................................ 50
5.2 Working Storage Temperature .............................................................................................. 50
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