AVR-Chat

I use a TI TPS3825-50DBV for reset control on all my ATmegaX (32, 644, 2560
etc) designs.

Jim

----- Original Message ----- 
From: "Henry Carl Ott" <carlott@interport.net>
To: <AVR-Chat@yahoogroups.com>
Sent: Saturday, June 24, 2006 11:58 AM
Subject: Re: [AVR-Chat] Is the Atmega8 Reset Pin Internal pull up resistor
enough ?


> At 12:51 AM 6/24/2006, you wrote:
> >Hi,
> >
> >     Does anyone know, almost for sure, that the external res and cap are
not
> >needed anymore ?? I know they cost very little but with TQFP parts the
size
> >matters. :-)
> >
> >Best regards,
> >Alexandre Guimaraes
>
>   I don't know for sure, But thinking along the same lines as you seem to
> be... I left the external reset resistor & cap off my last design.
>
>   Everything seems to work fine, including ISP. But I did notice that when
> I brushed my finger on the ISP connector and at the same time touched the
> tab of a HV switching FET I'd get spontaneous resets.
>   This is a bit extreme, but I think the answer is that in a normal noise
> environment you can leave the parts out of the design. In a high noise
> situation put them in, or better yet disable the reset pin entirely after
> development is done (proper use of BOD is probably advised.)
>
> Sorry for only having anecdotal evidence.
>
> -carl
>
>
> ----------------------------------------------
> Henry Carl Ott   N2RVQ
> tech@si.rr.com
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