Does ST have a processor in a SOT23 package ? 5 or 6pin would be great.
what is the smallest processor physically available ?
5x5mm is relatively small
If that's too big there is a 4x4mm part, and a 2.097x2.493mm wafer scale part
QFN is pretty small.
NXP once sent me an ARM chip on a tiny package the size of a pencil head. forgot its package name.
Was it this one ?
LS1012A 9.6 x 9.6mm ? a little over powered and tooo big, https://www.nxp.com/docs/en/fact-sheet/LS1012AFS.pdf
The PIC SOT23 is very under powered.
anything else ?
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