Manual

ZED-F9T-Integration manual
3.7.1 Authorization................................................................................................................................ 37
3.7.2 Multiple servers............................................................................................................................37
3.7.3 Preserving information during power-off................................................................................37
3.7.4 AssistNow Online......................................................................................................................... 37
3.8 Clocks and time.....................................................................................................................................41
3.8.1 Receiver local time.......................................................................................................................41
3.8.2 Navigation epochs....................................................................................................................... 41
3.8.3 iTOW timestamps........................................................................................................................42
3.8.4 GNSS times................................................................................................................................... 42
3.8.5 Time validity..................................................................................................................................43
3.8.6 UTC representation..................................................................................................................... 43
3.8.7 Leap seconds................................................................................................................................ 44
3.8.8 Real-time clock............................................................................................................................. 44
3.8.9 Date.................................................................................................................................................44
3.9 Timing functionality............................................................................................................................. 45
3.9.1 Time pulse..................................................................................................................................... 45
3.9.2 Timemark.......................................................................................................................................49
3.10 Security.................................................................................................................................................50
3.10.1 Spoofing detection / monitoring............................................................................................ 50
3.10.2 Jamming/interference indicator............................................................................................ 51
3.10.3 GNSS receiver integrity............................................................................................................52
3.11 u-blox protocol feature descriptions.............................................................................................. 52
3.11.1 Broadcast navigation data...................................................................................................... 52
3.12 Forcing a receiver reset.....................................................................................................................60
3.13 Firmware upload................................................................................................................................. 60
4 Design..................................................................................................................................... 61
4.1 Pin assignment......................................................................................................................................61
4.2 Power supply..........................................................................................................................................63
4.2.1 VCC: Main supply voltage.......................................................................................................... 63
4.2.2 V_BCKP: Backup supply voltage............................................................................................... 63
4.2.3 ZED-F9T power supply............................................................................................................... 64
4.3 ZED-F9T minimal design.................................................................................................................... 64
4.4 Antenna...................................................................................................................................................65
4.4.1 Antenna bias.................................................................................................................................66
4.5 EOS/ESD precautions.......................................................................................................................... 69
4.5.1 ESD protection measures.......................................................................................................... 69
4.5.2 EOS precautions...........................................................................................................................70
4.5.3 Safety precautions...................................................................................................................... 70
4.6 Electromagnetic interference on I/O lines.......................................................................................70
4.6.1 General notes on interference issues......................................................................................71
4.6.2 In-band interference mitigation................................................................................................71
4.6.3 Out-of-band interference........................................................................................................... 72
4.7 Layout......................................................................................................................................................72
4.7.1 Placement...................................................................................................................................... 72
4.7.2 Thermal management................................................................................................................ 72
4.7.3 Package footprint, copper and paste mask........................................................................... 73
4.7.4 Layout guidance........................................................................................................................... 74
4.8 Design guidance....................................................................................................................................76
4.8.1 General considerations............................................................................................................... 76
4.8.2 Backup battery............................................................................................................................. 76
UBX-19005590 - R05
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Contents Page 4 of 87
C1-Public Early production information