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2. Re: Is there a way to disable the ESD protection diodes on the PSoC3 pins?
Unfortunately that App note does not address channel to channel isolation at all.
Mike.
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3. Re: Is there a way to disable the ESD protection diodes on the PSoC3 pins?
Hello Mike,
Unfortunately it will not be possible. The ESD didoes cannot be disabled. How much one channel input is influencing the other channel ?
Best Regards,
VSRS -
4. Re: Is there a way to disable the ESD protection diodes on the PSoC3 pins?
Well, I was pretty sure that was what the answer would be for the negative side (diodes that are internally grounded), but the positive side goes to Vddio. If we didn't need to drive any pins high, then if Vddio was left unconnected those diodes would be effectively not there (although commoned together they are back to back from channel to channel).
This is not a case of one channel influencing the other UNLESS there is a voltage difference between them (common mode) that then causes the diodes to conduct. This can happen from 60Hz AC being coupled to long lines in an industrial plant.
Mike.
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5. Re: Is there a way to disable the ESD protection diodes on the PSoC3 pins?
The diodes are there rightfully so, and they should never be disabled. Your problem is in the common mode noise not in the Psoc! and for that there are a few techniques like analog isolation, instrument amplifiers....
