SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R11 Page 4 of 157
1.13.1 Network indication .......................................................................................................................................................... 45
1.13.2 Antenna supervisor.......................................................................................................................................................... 45
1.13.3 Dual stack IPv4/IPv6........................................................................................................................................................ 45
1.13.4 TCP/IP and UDP/IP .......................................................................................................................................................... 45
1.13.5 FTP ........................................................................................................................................................................................... 45
1.13.6 HTTP ....................................................................................................................................................................................... 46
1.13.7 Firmware update Over AT (FOAT) ............................................................................................................................ 46
1.13.8 Firmware update Over The Air (uFOTA) ................................................................................................................ 46
1.13.9 Power saving ...................................................................................................................................................................... 47
2 Design-in ........................................................................................................................................... 51
2.1 Overview ......................................................................................................................................................................................... 51
2.2 Supply interfaces ........................................................................................................................................................................ 53
2.2.1 Module supply (VCC) ..................................................................................................................................................... 53
2.2.2 Generic digital interfaces supply output (V_INT) .............................................................................................. 75
2.3 System functions interfaces ................................................................................................................................................... 76
2.3.1 Module power-on (PWR_ON)..................................................................................................................................... 76
2.3.2 Module reset (RESET_N) ................................................................................................................................................ 78
2.4 Antenna interface ....................................................................................................................................................................... 79
2.4.1 Antenna RF interface (ANT) ......................................................................................................................................... 79
2.4.2 Antenna detection interface (ANT_DET) ................................................................................................................ 88
2.5 SIM interface................................................................................................................................................................................. 92
2.5.1 Guidelines for SIM circuit design ............................................................................................................................. 92
2.5.2 Guidelines for SIM layout design ............................................................................................................................. 97
2.6 Data communication interfaces ........................................................................................................................................... 98
2.6.1 UART interface ................................................................................................................................................................... 98
2.6.2 USB interface ................................................................................................................................................................... 105
2.6.3 SPI interface ..................................................................................................................................................................... 107
2.6.4 SDIO interface ................................................................................................................................................................. 107
2.6.5 DDC (I
2
C) interface........................................................................................................................................................ 107
2.7 Audio ............................................................................................................................................................................................. 111
2.7.1 Guidelines for Audio circuit design ...................................................................................................................... 111
2.8 General Purpose Input/Output ......................................................................................................................................... 111
2.8.1 Guidelines for GPIO circuit design ........................................................................................................................ 111
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