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TPS23881: pin 52 auto function

Part Number: TPS23881

Hi Team,

may we know that pin52 is non-function?

 1. the pin52 become NC pin, is the pin on IC package completely useless or the software does not support it?

2. Hardware setup==> pin52 no need  to add resistance?

3. on software==> 4- pair, each port must use S/W to command the output Watt? can't it be automatic?

4. is the pin52 of TPS23881 on the EVM board already NC?