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 <hmur...@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@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@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.