Specifications

TREK‐510Usermanual55
2. RTCAlarmSetting:YoumayalsosetAlarmtime;youmaywakeupthe
systembythetimeyouhaveset. Pleaserefertobelowfigure6.
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Figure7.14RTCtest‐5
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7.3  Vehicle PowerManagement
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7.3.1PowermanagementMechanism
ThefeatureofVehiclePowerManagement(VPM)isprovidedforusersto
fulfillthespecialrequirementsonin‐vehicleapplications.
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z Ignitionon/off 
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Turnonthesystembyignition 
Forthecasesofin‐vehicleapplications, ignitionsignalisoftenusedtoturnonor
shutdownsystem.WhenthesystemisinOFFstateandignitionisturnON,theVPM
controllerwillcountd o wnON_DELAY;onceitcountstozero,thesystemwillbeturnon.
 Shutdownthesystembyignition 
Whenthesystemispoweredonandignitionisturnoff,theOFF_EVENT_DELAYwillstart
tocountdown.Duringthisstage,iftheignitionisbacktoON,VPMcontrollerwill stop
countdownandresettheOFF_EVENT_DELAYvalue.IfOFF_EVENT_DELAYiskeeping
countingtozero,VPMcontrollerwillsendaevent
(powerbuttonpress)tothesystem
andstarttocountHARD_OFF_DELAY.Theapplication programscouldwatchthiseventto
dopre‐definedtasks,likestoringth edataandpreparingtoturnoffsystem.
Oncegoinginto HARD_OFF_DELAYstage,thisprocesswillbeirreversible.Andif
HARD_OFF_DELAYcountstozero,the
systempowerwillbecutoffabrupt ly.
z Lowbatteryprotection 
Toavoiddrainingoutthecarbattery,low‐batteryprotectionisinvolvedtoensurethe
carbatteryiscapabletostartthevehicle.WhenthesystemisON,VPMcontrollerwill
monitorthecarbatteryvoltage.Ifthebatteryvoltageislowerthanaprogrammable
threshold(LOW_THRESHOLD),VPMcontrollerwillgo
intoLOW_DELAYstageandstart
tocountdown.
 DuringthestageofLOW _ DEL AYcount down,ifbatteryvoltageisback