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Nordic Power Profiler Hardware understanding

Reviewing the PCA63511_Schematic. On Sheet 2, looking at the nRF52832 chip

(1) What is PO.05 used for? It controls the BJTs (Q1A, Q1B and Q2A) which clamps the input to the ADC

(2) Under what conditions would a person want to cut "SB2"?

thx,

WaL

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