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@femtoduino @gojimmypi @0xF2 indeed, my guess is that that SAMD is my best choice. To be clear I was asking about my smallest option for an MCU IC. What I’m pondering is definitely going to require a custom board design.
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@femtoduino @gojimmypi @0xF2 Dead bugging a WLCSP35 to connect USB and a single pair of IOs and dunking the whole thing in epoxy is definitely the wrong thing to do.