Data Sheet

tothepolarityoftheconnector.ALiPobatterywithinternalprotectioncircuitsisrecommended.
Typicalcurrentconsumptionisaround180mAandupto1.8Atransientsat5VDC.Indeepsleep
mode,thequiescentcurrentis130uA[thisvaluemaychange](poweredfromthebatteryalone).
TheMAX17043fuelgaugeisonlycompatiblewithsinglecelllithium-ionbatteries.Thestate-of-
charge(SoC)valueswillnotbeaccuratewithotherbatterychemistries.
VBUS
VBUSisconnectedtotheUSBdetectpinofnRF52840toenablestheUSBinterface.The
recommendedinputvoltagerangeisbetween4.35Vto5.5VDC.Itisalsoconnectedtothebq24195
PMICtoallowforDPDM,detectionofthepowercapacityoftheUSBport.
3V3Pin
Thispinistheoutputoftheon-board3.3Vswitchingregulatorthatpowersthemicrocontrollerand
theperipherals.Thispincanbeusedasa3.3Vpowersourcewithamaxloadof800mA.Unlikethe
Photon,thispinCANNOTbeusedasaninputtopowerthemodule.
RTC_BAT
Thisisthesupplytothereal-timeclockbatterybackup.1.4to3.6V.
Voltage TypicalCurrent MaximumCurrent Unit
3.0V 56 330 nA
1.8V 52 290 nA
IftheRTCbatteryisnotused,connectRTC_BATtoground.
GNSS_BAT
Thisisthesupplyformaintainingtheu-bloxGNSSephemerisandalmanacdatawhenremoving
power.ThiscanusethesamebatteryasRTC_BAT,canbeasuper-capacitor,orcanbeomitted.1.5
to3.6V.Typicalcurrentis15uA.
IfyouarenotpoweringGNSS_BATwithabatteryorsuper-capacitor,connectGNSS_BATto3V3.
Savingtheephemerisandalmanacdatacanimprovefix/locktime.
Itwon'tmakeadifferenceoncompletelycoldboot,whereisnopreviouslysaveddata.
ItdoesnotmakeadifferenceiftheGNSSisconstantlypoweredorisusingasoftwarepower
savemode.