Hi,

I think you have right saying "fundamental design flaw". It is your power
supply. The absolute maximum of Supply Voltage (D001) is 5.5V as described
in the recent datasheet. As I researched your problem, I was surprised
there are some newer PICs allowing up to 6.0V, but for the said type this
is not the case.

I hope this helps.

Regards,
Imre


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On Mon, 8 Oct 2001, Jonathan Luthje wrote:

> G'day all,
>     I have a question relating to the 16F84A processor - basically all I'm
> doing is switching on and off a couple of relays via a 1.6mA base current to
> a pair of BF246 NPN transistors. There are 3 pins (RB0,1,2) set to output -
> the rest are set to input, some tied high, some tied low, all via 2k0
> resistors, all unused pins are tied together, set to input and tied to
> ground via a 2k0 resistor. I have regulated and filtered 6vdc supply rails
> powering the thing.
>
> The circuit and program were working beautifully up until the time where the
> circuit "browned out" and caused the PIC to get very hot (hot enough to put
> a blister on my thumb - ouch). I've since installed a reset-on-brownout
> circuit as given in the 16F84A datasheet. This is PIC #3 that this has
> happened to ... it's starting to get a little expensive! :)
>
> Is there some fundamental design flaw I'm making here?
>
> Thanks in advance,
>
>
> Regards,
>
>
> Jonathan Luthje
>
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>
>

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