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TPS4H160-Q1: about Open-Load detection

Part Number: TPS4H160-Q1

Hi team

may I get your reply ?

[1] TPS4H160-Q1 A-Version don't have CS pin,

      so A-Version cannot detect Open load at On-State ?

      if customer wants to detect Open load at On-State,

      he has to use B-Version with CS pin output and he has to judge Open load at On-State manually using CS output ?

[2] both A-version and B-version have ability to detect Open load at Off-stage,

    but customer needs external pull up resistance for seamless detection ?

[3] D/S recommends 20Kohm external pull up.

     BTW,,, what is the Max allowable external pull up resistance to minimize leakage current at Off-stage ?