Thanks Robin,

That's what I thought so, however, one of my friend claims that he put Vdd
to Vain and since then he's complete AD stopped working. I think there must
have been something else there.

Thanks anyway,
Tamas


On Nov 14, 2007 3:50 PM, Robin Abbott <robin.abbott@fored.co.uk> wrote:

> Nope - no damage, it will simply  use the higher voltage as the reference.
> All inputs including analog (except Vpp) have input protection diodes to
> Vdd
> and therefore any voltage which exceeds Vdd+0.7V or so will be clamped to
> Vdd. If the input current is too high the input can be destroyed, or worse
> damage to the chip can be caused.
>
> In your example there is no issue !
>
>
> Robin Abbott
> Forest Electronics - Home of WIZ-C ANSI C Compiler for PIC's with RAD
> Front
> end
> robin.abbott@fored.co.uk
> www.fored.co.uk
>
>
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of
> Tamas Rudnai
> Sent: 14 November 2007 15:02
> To: Microcontroller discussion list - Public.
> Subject: [PIC] Max Vain
>
> Hi guys,
>
> Just confused about the max Vain regading to Vref and Vdd. So Datasheet
> says
> any pin can take a max of Vdd+0.3V. There is a small parameter Ad07 in teh
> 16F690 DS so it says Vain max is Vref. OK, I have a 2.5V Vref it measures
> up
> to this, but is the pin damages if I put more voltage there - like Vdd?
> Would it destroy that input gate?
>
> Thanks
> Tamas
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