At 02:04 AM 3/13/97 -0500, Scott Stephens wrote:

>How good of a comparator is a PIC input? Is it affected by power supply
>noise, output swiching/states, et?

Hi Scott:

I'm doing something like this for a automotive application. I started with
a 16C54/56, but found the switch point on the digital input would vary
between production runs. I've since gone to a 16C62x part as I can get
repeatability on the trigger point due to its built in analog comparator
and setable VREF. You'll need a fixed R/C value also for a reference
due to temperature variations. Also the 16C62x part has a built in
brownout which was a real plus for me as compared to the 16C5x part.

I'm still working on it so I'll let you know how well it works out.


Regards,

------------------------------------
| Jeff King      Aero Data Systems |
| jeff@mich.com  P.O. Box 510895   |
| (810)471-1787  Livonia, MI 48151 |
|F(810)471-0279  United States     |
------------------------------------