Hi
> On Jun 9, 2016, at 3:31 PM, Nick Sayer via time-nuts <[email protected]> > wrote: > > >> On Jun 9, 2016, at 10:11 AM, Bob Camp <[email protected]> wrote: >> >> >> One very real possibility is: The reason we *have* all these parts is that >> they >> have a bug in them, and were scrapped out because of it. >> > > From what I’ve read elsewhere (and I can’t find a citation right now), they > (at least the FE-5680As) were used in cell phone bases that were > decommissioned after network upgrades. That’s always been the leading theory. It matches up with the reason you see a lot of other ex-cell gear out of China. It may or may not be correct in this case. We never ever seem to get a fully authoritative answer to those sort of questions. Bob > >> Bob >> >> >>> On Jun 9, 2016, at 8:03 AM, Clint Jay <[email protected]> wrote: >>> >>> 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" <[email protected]> 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 <[email protected]> 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 -- [email protected] >>>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>> and follow the instructions there. >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
