> Super Cap:
> Pros: Simple to implement and usually durable if used within specs
> Cons: potentially high inrush currents, somewhat limited storage
> capacity for cost (likely not a problem for your application's spec)
>

I've used supercaps to power RTCs. I have a series diode and resistor to
the main main supply to charge and limit inrush. Recently I've just used a
once per second interrupt and NTP. That does not handle the origi al
datalogging requirement, though.

Harold

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