User's Manual

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7.1.2 OnboardLDOPower
OnsomeLaunchPadkits,the3.3Visnotcapableofsourcingthe350‐mApeakcurrent requiredforthe
BOOSTXL‐CC3120MODmodule.If the350‐mApeakcurrentcannotbesourced,theonboard3.3‐V LDO 
canbeused(seeFigure7‐3).ThisLDOmustbesourcedfromthe
USBconnectorontheBO OSTXL‐
CC3120MODandtheLaunchPadkitinashared‐loadmanner.
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Figure7‐3:3‐3‐VPowerFromLDO
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7.2 MeasuringtheCC3120MODCurrentDraw
7.2.1 Low‐CurrentMeasurements(HibernateandLPDS)
TomeasurethecurrentdrawoftheCC3120RMandtheserialflash,ajumperisprovidedontheboard
labeledJ6.Byremovingthisjumper,onecanplaceanammeterintothispathandthecurrentcanbe
observed.ThismethodisrecommendedformeasuringLPDSandhibernatecurrentsthatare
ofthe
orderoffew10sofmicroamps.
Thejumperisremovedandanammeterisadded inseriestomeasurethehibernateandLPDScurrents
(seeFigure7‐4).