Data Sheet

PMID
ThispinistheoutputoftheinternalboostregulatorofthePMICthatcansource5.1VDCfromthe
batteryinOTG(OnTheGo)mode.Thisfeatureisusefulwhenyourcircuitryneedsa5Vsourcefrom
themodulewhenpoweredbythebatteryalone.
Theconfusingbitaboutthispinisthatitwillcontinuetoprovide5.1VDCbutonlywhentheinput
voltage(VIN)isbetween3.6Vto5.1VDC.Assoonastheinputvoltageexceedsthislimit,thePMID
startstrackingthatvoltage.ForexampleifVIN=9VDC,thePMIDwillbe9VDCand NOT5.1VDC.So
youneedtobecarefulwhenusingitasasourceforpoweringyourexternalcircuitry.Themax
currentdrawonthispinis2.1Abutisnotrecommendedduetothermallimitationsofthecircuit
board.
ThereareanumberofU.FLantennaconnectorsontheTrackerSoM:
Label Purpose
GNSS u-bloxGNSSantenna(GPS)
CELL Quectelcellularmodemantenna
WIFI
Wi-FiantennaforWi-Figeolocation(optional)
1
BLE
ExternalBluetooth(optional)
2
GNSS/DIV
QuectelGNSSantenna(optional)
1
DIV
LTEcellularreceivediversityantenna
3
1
Notsupportedininitialrelease.
2
ThereisaBLEchipantennaonthemodule,theexternalBLEantennaisoptional.
3
DIVistheconnectorfortheLTEcellularreceivediversityantenna(T523only).Asecondcellular
antennacanbeconnectedtothisconnectortoimproveperformancewhenthedevicewillbe
movingathighspeeds.ItisonlyusedforLTECat1connectionsandisnotsupportedwhenin2Gor
3Gmode.Thisantennaisnotnecessaryinmostcasesandisnotincludedinevaluationkits.The
T402doesnothavethisconnectorasreceivediversityisnotsupportedinLTECatM1mode.
ThereisnoU.FLconnectorforNFC.IfyouwishtousetheNFCtagfeature,you'llneedtoaddan
antennaorantennaconnectoronyourbaseboard.
Theantennaplacementneedstofollowsomebasicrules,asanyantennaissensitivetoits
environment.Mounttheantennaatleast10mmfrommetalcomponentsorsurfaces,ideally
20mmforbestradiationefficiency,andtrytomaintainaminimumofthreedirectionsfreefrom
obstructionstobeabletooperateeffectively.
Needstuningwithactualproductenclosureandallcomponents.
FortheBLEantenna,itisrecommendedtousea2.4GHzsingle-frequencyantennaandnota
2.4GHz+5GHzantenna,soastoavoidlargegainatthefrequencytwiceof2.4GHzwhichcan
causethesecondharmonicradiationof2.4GHztoexceedstandards.
ANTENNAS