Peter Homann wrote:
>
> Hi,
>
> I need to protect my PIC16LF84 against reverse polarity. Currently I'm
> running the circuit of 2 x 1.5 N cells (2/3 AAA). I want to protect the
> circuitry from the batteries being inserted the wrong way.

Just a thought,

I wonder if the PIC will be damaged at all with a 3V reversed battery.

Every protection diode on the IO pins will be conducting between VCC and
GND rails in the chip, thus trying to drop the battery voltage to around
1.2V.

Maybe no damaging current is available to flow into the chips' 'guts'.

Perhaps a simple resistor in series with VCC will suffice to limit this
current.

Maybe this is why I have not damaged 16F84's by inserting them into a
socket the wrong way around.

--
Best regards

Tony

PicNPoke - Multimedia 16F84 Beginners PIC Tools.

http://www.picnpoke.com
Email picnpoke@cdi.com.au