[time-nuts] One sure way to kill your FE-5680A or FE-5650A
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:
> 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
> using the same basic parts that don’t turn into a brick when this or that
> > 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
> > CPU. That screwed up when the power supply ramped up slowly enough.
> > 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
> > on the power monitor subtracts from the power supply tolerances.
> > There is another worm in the can. How long does it take for your
> > to get going?
> > --
> > These are my opinions. I hate spam.
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