Ah, thanks... That makes sense. It would be nice if the board shipped with some sort of documentation. Is there documentation that would mention this available online somewhere that I missed?
You can also remove the jumper and measure the current across the pins. This way, you can check how much power you're consuming in various modes (ie 1 COG, 2 COGs, slow rc oscillator, etc).
Mike Green said...
It connects the 3.3V Vdd lines on the board to the 3.3V regulator. If you want to get your 3.3V from some other source, you can take off the jumper.
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Chip Gracey
Parallax, Inc.