this post was submitted on 30 Jan 2024
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This is actually a big deal, but for the wrong reasons people expect.
Many, many, many chips can do this. Its not the chip that's the hard part, but the board, which includes the voltage regulator and RTC pieces, all designed for minimal power. Case in point: a tantalum capacitor leaks roughly 1uA (or 1000nA), so any tantalum capacitor screw you over.
Creating a design AND testing / verifying it at under 1uA sleep is difficult. Its well beyond just choosing a chip and programming its sleep state. So much of the board needs to be thought of holistically.