Data Sheet

12/23/2015 PowerOverEthernetforArduino|Freetronics
http://www.freetronics.com.au/pages/poweroverethernetforarduino#.VnqWJrZ97IU 5/6
Ifyourpowersourcingequipmentsuppliesahighervoltage,suchas16Vor24V,it'snotsafetosimplypassitdirectlyto
theArduino'svoltageregulatorusingsimplejumpersasshownabove.Inthatsituationyoushouldfitadaughterboardto
theEthernetshieldsothatitpreregulatestheincomingpowerdowntoasafelevelbeforepassingitontotheArduino.For
inputvoltagesbetween14Vand24V,FreetronicshasaPoEVoltageRegulator1424Vavailable.ThePoERegulatorusesa
simplelinearvoltageregulatortotrimtheinputvoltagedownto12VbeforeitissenttotheArduino,savingtheArduino's
voltageregulatorfromhavingtodissipatealargervoltageandprotectingtheArduino'sinputcapacitors(whichhavea
relativelylowvoltagerating)fromdamage:
ToconnectyourPoweredDevicetoanetworkwithPowerSourcingEquipmentthatsupportsthefull802.3standard,things
becomealittlemorecomplicated.StandardscompliantPDsmustacceptupto48Vfromthenetworkandimplementan
activesignallingmechanismtotellthePSEhowmuchpowertheyneed,soimplementingitisn'tsosimple.Tomakeit