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Replying to @captainwonkish

I did watch the video on that ABLIC chip, it looks cool! But the SAM L21 in deep sleep can give it a run for its money: with the RTC running, its BACKUP mode consumes under 0.7 µA @ 25° C. Not quite the 0.2 µA of the ABLIC, but I think quite respectable for a one-chip solution.

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