AVR-Chat

Richard Cooke wrote:
>
> Hi David,
>
> I built up two new boards - one had an ATmega48V from the batch that
> was the same as the Ver1 board and the other was from a different batch.
>
> Thanks,
>
> Richard Cooke
>
> --- In AVR-Chat@yahoogroups.com <mailto:AVR-Chat%40yahoogroups.com>, 
> David Kelly <dkelly@...> wrote:
> >
> > On Mon, Nov 12, 2007 at 08:02:13PM -0000, Richard Cooke wrote:
> > > Dennis,
> > >
> > > I've been trying to come up with assumptions to test. The thing that
> > > really is frustrating is the firmware works on one board but not the
> > > new ones so I think that the firmware can be eliminated as the source
> > > of the error.
> >
> > New boards using new chips? Do you have any new old stock from the prior
> > batch of boards? Sometimes chips change. Search the errata notices at
> > Atmel.com.
> >
> > --
> > David Kelly N4HHE, dkelly@...
> > ========================================================================
> > Whom computers would destroy, they must first drive mad.
> >
>
>  
How about take a working Ver1 board and transfer components (like the 
mega48V) to a Ver2 board? It *IS* possible to have bad parts.

Also, are you absolutely sure that the boards are good? Were they 
netlist tested or golden-board tested? If the latter, it is possible 
that the entire batch of Ver2 boards has the same error.

What is controlled by the pins in question? What happens if you comment 
out *both* lines?

Have you tried replacing the power supply with something super stable 
and low impedance?

Hang in there.

-- 
Phillip Vogel
Bartal Design Group, Inc.
318 Marlboro Road Englewood, NJ 07631-1416
Phone: 201-567-1343      Fax: 201-568-2891
Cell: 201-232-5208    
mailto:phillip@bartal.com  http://www.VisualConductor.com



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