ZED-F9P-Integration Manual
3.5.2 Navigation epochs....................................................................................................................... 43
3.5.3 iTOW timestamps........................................................................................................................44
3.5.4 GNSS times................................................................................................................................... 44
3.5.5 Time validity.................................................................................................................................. 45
3.5.6 UTC representation..................................................................................................................... 45
3.5.7 Leap seconds................................................................................................................................ 46
3.5.8 Real time clock............................................................................................................................. 46
3.5.9 Date.................................................................................................................................................46
3.6 Timing functionality............................................................................................................................. 47
3.6.1 Time pulse..................................................................................................................................... 47
3.6.2 Timemark.......................................................................................................................................51
3.7 Security (operating, monitoring and maintaining)........................................................................ 52
3.7.1 Receiver status monitoring....................................................................................................... 52
3.7.2 Spoofing detection / monitoring...............................................................................................54
3.8 u-blox protocol feature descriptions................................................................................................ 54
3.8.1 Broadcast navigation data.........................................................................................................54
3.9 Forcing a receiver reset....................................................................................................................... 60
4 Design..................................................................................................................................... 62
4.1 Pin assignment......................................................................................................................................62
4.2 Power supply..........................................................................................................................................64
4.2.1 VCC: Main supply voltage.......................................................................................................... 64
4.2.2 V_BCKP: Backup supply voltage............................................................................................... 64
4.2.3 ZED-F9P power supply............................................................................................................... 65
4.3 ZED-F9P minimal design.................................................................................................................... 65
4.4 Antenna...................................................................................................................................................66
4.4.1 Antenna bias................................................................................................................................. 67
4.5 EOS/ESD precautions.......................................................................................................................... 70
4.5.1 ESD protection measures.......................................................................................................... 70
4.5.2 EOS precautions...........................................................................................................................71
4.5.3 Safety precautions...................................................................................................................... 71
4.6 Electromagnetic interference on I/O lines.......................................................................................71
4.6.1 General notes on interference issues...................................................................................... 72
4.6.2 In-band interference mitigation................................................................................................72
4.6.3 Out-of-band interference........................................................................................................... 73
4.7 Layout......................................................................................................................................................73
4.7.1 Placement...................................................................................................................................... 73
4.7.2 Package footprint and solder mask.........................................................................................73
4.7.3 Layout guidance........................................................................................................................... 73
4.8 Design guidance....................................................................................................................................75
4.8.1 General considerations............................................................................................................... 75
4.8.2 backup battery............................................................................................................................. 75
4.8.3 RF front-end circuit options...................................................................................................... 76
4.8.4 Antenna/ RF input....................................................................................................................... 76
4.8.5 Ground pads..................................................................................................................................77
4.8.6 Schematic design........................................................................................................................ 77
4.8.7 Layout design-in guideline......................................................................................................... 77
5 Product handling................................................................................................................. 78
5.1 ESD handling precautions.................................................................................................................. 78
5.2 Soldering.................................................................................................................................................78
UBX-18010802 - R04
Contents Page 4 of 99
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