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UCD3138: RSVD pin

Part Number: UCD3138

Team,

quick question about RSVD.  A customer currently has RSVD shorted to BP18. 

We just found the note that RSVD (Pin 61) should be connected to BP18 through 1-kΩ resistor. can you confirm  What is the RSVD pin function?  Why does is have to be 1k?