Sorry, I've been quite busy and never got back to this... I had wondered why, in the above mentioned appnote (ww1.microchip.com/downloads/en/AppNotes/01298A.pdf), 2 channels are needed (and if it's possible to get by with just 1)... I plan to do some testing one of these days, but I'm busy with other projects at the moment... anyway, that's where I was going with my post...
regards
Michael
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