On 3/10/06, Olin Lathrop <olin_piclist@embedinc.com> wrote:
> Herbert Graf wrote:
> > The ENC28J60 is a fixed function device, aside from say grounding an
> > output set at one I don't really see how it could consum more power or
> > less while operating (ignoring possible sleep modes). It's frequency is
> > fixed (25MHz), it's IO is fixed, so there shouldn't be too much power
> > fluctuation while operating.
>
> I expect large parts of the chip aren't doing much when no packets are
> coming and going.  The chip has 8 Kbytes of static RAM.  This probably draws
> significantly more power when being accessed than when just sitting there.
>
> In any case, the data sheet says 250mA, so anything less than that is a nice
> freeby but you can't count on it.  It may be quite possible that some
> devices at some temperatures at some level of inactivity draw only 150mA,
> but so what?  You still can't design around that number, and it's otherwise
> clearly within spec.  I fail to see what the issue is.

Hi all,
Thanks for the posts,
I never worked on NIC chips before and when my ENC got hot, i thought i am
getting some troubles. but after your mails understood that, its normal to draw
that much current, since it need to drive magnetics and run 8K memory.

Thanks once again,
-palani
because, it need to drive magnetics and

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