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CCS/UCD3138A64: How should I do for UCD3138A64 RTC_IN_1_8(pin62) when not use this function?

jack chen64
Prodigy 50 points
Part Number: UCD3138A64

Tool/software: Code Composer Studio

Hi

I find UCD3138A64 RTC_IN_1_8(pin62) have 1.8V when I measure on this pin.

How should I do for UCD3138A64 RTC_IN_1_8(pin62) when not use this function?

Short to GND, put high to VCC, configure as special function or just let this pin floating.