18F1220 A/D Converter question

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  1. - 28th July 2011, 09:06 #3
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    BobEdge
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    Default Re: 18F1220 A/D Converter question

    Hi,

    Yes I do have a 1uF cap on the input, but between input, and Vss. Reading the data sheet a few times it is only necessary to sleep if using the RC osc.

    The problem must be due to interference. My prototype boards do have quite a few wires all over the place, no ground plane, and when the welder is running at 2000A there must be large magnetic fields all over the place.

    Strange though, even when idle the signal will be rock solid for 30 seconds or so, then it jumps all over the place for a bit, then solid again. No signs of anything on the input when using the scope in glitch detect mode. I suspect it would work fine on a propper pcb, with ground planes.

    Regards
    Bob.
    Last edited by BobEdge; - 28th July 2011 at 09:09.
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