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Unused Vddb pin

Hello,  I am using a ADUM5230 currently without any issues but am only using the upper half of the chip.  I am grounding the unused Vddb pin, I have floated it as well and note no difference in input current.  Is there a preferred way to handle this unused pin.


  • Alta: The VDDB in can be grounded or left open if not used.  The VDD1 current does not change when VDDB is not used since there is only the quiescent current of the VIB encoder circuit and no power connection from the VOB Decoder circuit to the isoPower Viso to consume current from VDD1.

    Regards, Brian