ok thank you for the reply. Le jeudi 26 mai 2016 21:08:19 UTC+2, john3909 a écrit : > > There are several other factors that affect decoupling: > > PCB Layout (smaller is better) > Ground planes size, distance between ground planes and dielectric material > used > Decoupling cap ESR > Proximity of the decoupling caps to the power pins > Number and size of vias connected to power pins (think of vias as a small > inductor) > Copper pour profile used to connect power pins to power rail > > Clearly the BBB layout is optimal and that is why they managed to make the > board work with fewer decoupling caps. > > Regards, > John > > > > > On May 26, 2016, at 8:52 AM, Gerald Coley <[email protected] > <javascript:>> wrote: > > Same answer as before. > > BeagleBone came first. > Smaller board size. > Lower cost > And it works. > > Gerald > > On Thu, May 26, 2016 at 10:46 AM, <[email protected] <javascript:>> > wrote: > >> I see difference between last schematic of beaglebone black and am3358 >> starter kit board concerning vdds_ddr decoupling cap. Am3358 sk board has >> 21 decoupling cap and beaglebone black uses 9 decoupling caps. The am3358 >> datasheet specifies tu use min 20 decoupling caps. Why this difference? >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/b282b991-9043-4f98-8626-44bc5acb4de6%40googlegroups.com >> . >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > Gerald > > [email protected] <javascript:> > http://beagleboard.org/ > [email protected] <javascript:> > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/CAHK_S%2BcKFuME82TcQfgtafO-63ZXVDNERAAcs8qmGs1q-doWqQ%40mail.gmail.com > > <https://groups.google.com/d/msgid/beagleboard/CAHK_S%2BcKFuME82TcQfgtafO-63ZXVDNERAAcs8qmGs1q-doWqQ%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > > >
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