Quote:
Originally Posted by knc1
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Edit-3:
Added tech. sheet on switch chip.
The MicroFTX "cb" outputs are open-drain with a 75k ohm pull-up.
So far, the chip's I/O cells are referenced to 1v8 (since that matches the serial port I/O levels).
But the boot-mode lines need to be connected together (I am assuming here) to emulate a mechanical switch.
Plus, they are running on the 3v3 supply rail(s).
Hence, the added-in, switch chip.
And since they come in four per package ...
There are enough for all four "CB" outputs, if required by another project.
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Hmm...
Edited the tech-post but forgot to mention the addition.
(Which is why #4 is announced before #3 - my bad - getting old(er) )