DS3231 without VCC

Hello

I understand the DS3231 RTC can be powered without VCC which lowers current consumption. Without VCC connected (which would be my preference), can it still generate an alarm interrupt to my atmega328p (i.e. via SQW output)?

spaceuino:
Without VCC connected (which would be my preference), can it still generate an alarm interrupt to my atmega328p (i.e. via SQW output)?

Yes.

But you do need a backup supply on the Vbat pin.

See the device datasheet for details.