SARA-G450 - System integration manual
UBX-18046432 - R08 Contents Page 4 of 143
C1-Public
1.13.9 Smart temperature management ................................................................................................ 48
1.13.10 AssistNow clients and GNSS integration .................................................................................... 51
1.13.11 Hybrid positioning and CellLocate® .............................................................................................. 51
1.13.12 Firmware upgrade Over AT (FOAT) ............................................................................................... 54
1.13.13 Last gasp ............................................................................................................................................ 54
1.13.14 Power saving ...................................................................................................................................... 55
2 Design-in ................................................................................................................................................ 56
2.1 Overview ...................................................................................................................................................... 56
2.2 Supply interfaces ...................................................................................................................................... 56
2.2.1 Module supply (VCC) ........................................................................................................................ 56
2.2.2 RTC supply (V_BCKP) ....................................................................................................................... 70
2.2.3 Interface supply (V_INT) ................................................................................................................... 71
2.3 System functions interfaces .................................................................................................................. 72
2.3.1 Module power-on (PWR_ON) .......................................................................................................... 72
2.3.2 Module hard power-off (PWR_OFF) .............................................................................................. 73
2.3.3 Digital I/O interfaces voltage selection (VSEL)........................................................................... 74
2.4 Antenna interface ..................................................................................................................................... 75
2.4.1 Antenna RF interface (ANT) ........................................................................................................... 75
2.4.2 Antenna detection interface (ANT_DET)..................................................................................... 82
2.5 SIM interface .............................................................................................................................................. 85
2.5.1 Guidelines for SIM circuit design ................................................................................................... 85
2.5.2 Guidelines for SIM layout design ................................................................................................... 90
2.6 Serial interfaces ........................................................................................................................................ 91
2.6.1 Primary main serial interface (UART) ........................................................................................... 91
2.6.2 Secondary auxiliary serial interface (AUX UART) ....................................................................... 98
2.6.3 Additional serial interface for FW upgrade and Tracing (FT UART) ...................................... 99
2.6.4 DDC (I2C) interface ......................................................................................................................... 100
2.7 Audio interfaces ...................................................................................................................................... 107
2.7.1 Analog audio interface ................................................................................................................... 107
2.8 General Purpose Input/Output (GPIO) ................................................................................................. 112
2.9 Reserved pins (RSVD) ............................................................................................................................. 113
2.10 Module placement ................................................................................................................................... 113
2.11 Module footprint and paste mask ........................................................................................................ 114
2.12 Schematic for SARA-G450 modules integration .............................................................................. 115
2.13 Design-in checklist ................................................................................................................................... 116
2.13.1 Schematic checklist ........................................................................................................................ 116
2.13.2 Layout checklist ............................................................................................................................... 117
2.13.3 Antenna checklist ............................................................................................................................ 117
3 Handling and soldering .................................................................................................................... 118
3.1 Packaging, shipping, storage and moisture preconditioning ......................................................... 118
3.2 Handling ..................................................................................................................................................... 118
3.3 Soldering .................................................................................................................................................... 119
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