We want to set the unused pins in ADSP21489 to avoid the noise/ESD interference.
What is the best status for the pins. Output High Z or Output Low Z?
And are there any places that we need to pay attention in terms of DAI/DPI/GPIO/MEMORY setting?
Generally, if internal pull-ups (IPU) or pull-downs (IPD) are included, the pins can be left floating, if unused. Any pin that is output only can always be left floating.
If internal pull-ups and pull-downs are not included or disabled, pins can normally still be floated with no functional issues for the device. However, this may allow additional leakage current.
Having said this, ADSP-2148x datasheet pin descriptions (Page No 14) includes recommendations on how to handle pins on interfaces that are disabled or for unused pins on interfaces that are enabled.
(Note : Specifically the WDT_CLKIN pin and all the MLB pins has to be connected to ground when not used)
Hope this helps
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