You can also put in series resistors to limit current and diode clamps to
power and ground. This will be minimal on static due to the speed of the
transient but will increase the general protection from bad things getting
into your chip. ;)


At 02:22 PM 9/23/97 -0700, you wrote:
>     Hi All,
>
>     Does anyone here know a really good static control method that works
>     with the PIC16F84? I have six I/O lines that go outside of the
>     project's case and go through really long wires to switches. Some of
>     the wires are exposed and will be fiddled with by people, and I don't
>     want the chip damaged. I've checked the Microchip application notes,
>     and they say to put at 10000 pf capacitor from power to ground. Is
>     this all that is necessary?
>
>     I thought of putting in a TTL buffer or an optoisolator, but the data
>     lines need to bidirectional. I also need to keep the costs down as
>     much as possible, as well as the part count.
>
>     Thanks in advance,
>
>     Eric
>
>
Larry G. Nelson Sr.
L.Nelson@ieee.org
http://www.ultranet.com/~nr