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TPL5010: TPL5010 Rext open

Part Number: TPL5010

Hello,

I have some question about TPL5010.

Is Rext necessary for TPL5010 operation?

I know that to set the time interval, the Rext is required. 

I'm considering removing Rext. 

max supply current of TPL5010  is 400uA in digital conversion of external resistance (Rext) condition.

If Rext is opened, is max supply current 50uA?