> 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. > 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.
