I think that using hysteresis on any comparator is almost every time
necessary. Comparator have a large offset, about  20mV, is a pour one.
I dont see any reason to not work. Internal port resistence can't affect
too much the hysteresis computation. Large hysteresis, small errors.

Vasile

On Thu, 13 Dec 2001, Andrew Crosland wrote:

> Hi,
>
> I want to use a comparator in an F628 in mode 6 with comparator outputs
> available off-chip. I intend to use the usual resistor network to add
> hysteresis to the comparator and use it as a schmitt trigger.
>
> Has anyone done this?
>
> Any problems in using the on-chip comparators in this mode?
>
> Will the PIC I/O on the comparator affect the calculations for hysteresis?
>
> Regards
>
> Andrew Crosland
>
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