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DS90UB948-Q1: SPI PINs(SPLK, POCI, PICO PIN) floating

Part Number: DS90UB948-Q1

Hello Experts,

In the spc,  It was mentioned that If they are unused, tie to an external pulldown, like below:

May I know what's the reason of it? If the design leave them as floating, what will be happened?

Thanks a lot!