Hi, Koichi
Sorry for the late reply,
If you are using the analog pin in the ADC the input voltage should be between VREFL(-100mV - 100mV ) and VREFH (min 1.13v - max 3.6v), if you are using CMP or DAC the input voltage should be MIN VSS-0.3V -- MAX VDD (1.71V - 3.6V)
You can check more information about the Analog Input electrical specifications in section 3.6 of the datasheet
Hope it helps,
Regards!
Patricia
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