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TPS40322: Pin3, EN1/SS1 function question.

Part Number: TPS40322

Hi, I know if want to enable this part. I need to floating this pin. It's about 6V on this pin when IC turn on that measurement it. 

Where does this 6V come from?

I don't see any description about this high level voltage in the datasheet.

Could you help to provide the more detail description about EN1/SS1 pin working behavior?



Kenny, Quanta.