[time-nuts] One sure way to kill your FE-5680A or FE-5650A

Clint Jay cjaysharp at gmail.com
Thu Jun 9 08:03:14 EDT 2016


It would seem so bit I don't remember seeing a 'reset'  chip in the 5680.
I'm wondering if there's scope to add one onto the rail that runs the PSD
and 80C320 to keep it in reset.
On 9 Jun 2016 13:00, "Bob Camp" <kb8tq at n1k.org> wrote:

> Hi
>
> Based on the number of different ways there seem to be to corrupt the
> operating software
> in the FE Rb’s …. they seem to have a unique problem. There are a *lot* of
> devices
> using the same basic parts that don’t turn into a brick when this or that
> happens.
>
> Bob
>
> > On Jun 9, 2016, at 4:31 AM, Hal Murray <hmurray at megapathdsl.net> wrote:
> >
> >
> >> The ATTinys have brownout detectors in them that’s supposed to keep them
> >> from going bonkers during undervolt periods.
> >
> > Startup and/or brownout has long been a nasty problem area for digital
> > designers.
> >
> > In the old old days, there was typically a R/C delay on the reset pin to
> a
> > CPU.  That screwed up when the power supply ramped up slowly enough.
> Most
> > old timers have that merit badge.
> >
> > Modern CPU chips often have specs like power must be OK for 200 ms before
> > releasing Reset.  Anything like that will have at least one corresponding
> > power monitor chip with several supply voltage inputs and the appropriate
> > delay.
> >
> > The brownout side gets ugly when you look at the tolerances.  The
> tolerance
> > on the power monitor subtracts from the power supply tolerances.
> >
> > There is another worm in the can.  How long does it take for your
> oscillator
> > to get going?
> >
> >
> >
> > --
> > These are my opinions.  I hate spam.
> >
> >
> >
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at febo.com
> > To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>


More information about the time-nuts mailing list