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TPS2121: ST Pin?

Part Number: TPS2121

Tool/software:

Hi,

I use two batteries in IN1(Main) and IN2(Back up) in XREF mode. My question is what is the purpose of using a 1mega ohm resistor in  ST Pin?

ST pin is Input is Output?

can I use external MOSFET  to detect which power supply is ON? 

Regards

Pandian