AnBer: I realize that it is in writing on the Internet, therefore it must be true.
But, the board as documented by "SweedJesus" is a non-standard and unusual construction for PC boards, therefore there is a slight chance that the information is wrong. I would suggest that you use the dimensions suggested by myself and John. Please also realize that the dimensions and parameters in building PC boards that affect your E&M modeling are typically +/- 10 percent, sometimes +/- 20 percent, so do not spend a lot of time chasing decimal places for the input to your modeling program. --- Graham == On Mon, Nov 24, 2014 at 6:12 AM, AnBer <[email protected]> wrote: > Graham, John, > > Thanks for the comments. > > I finally found the layer stackup document for the BBB (revB4). > Strangely enough I could not find it in a readable format from: > http://elinux.org/Beagleboard:BeagleBoneBlack#Hardware_Files > I found it at the below page for an older BBB version: > > https://github.com/SweedJesus/Beaglebone-Black-Stuff/tree/master/Docs/Beaglebone%20Black/BBB_PCB/BeagleBone_Black_RevB4_MFG > > From the beaglebone_black_RevB4_NOLOGO_FAB.pdf enclosed file looking at > the different info I can see: > - TOP and BOTTOM layers are: 1/2 oz + 150 microinches of plating (ie > 0.150 mils) > - INNER layers are: 1 oz > which seems different from what is defined from the BBB Altium PCB stackup > (beaglebone_black_RevB4.pcbDoc): > - TOP and BOTTOM layers are: 2.4 mils > - Inner layers are: 1.2 mils > Using the below convert 1/2 oz should be 0.88 mils and 1 oz 1.37 mils: > http://www.referencedesigner.com/cal/cal_02.php > > Am I missing something in the oz to mils conversion? > Even if the Layer stack-up table from the .pdf file says that all > dimension are in INCHES it looks like that the that it is oz and mils > instead. > > In both document the total board height is 62 mils. > > AnBer > > On Wednesday, February 8, 2012 9:00:30 AM UTC+1, manatarms wrote: >> >> Dear All >> >> Does someone have the stackup of the BeagleBone PCB? I couldn't find >> it on the hardware design page and it would help many people who want >> to do their own design. >> > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/OUpHBFIA1uc/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- 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]. For more options, visit https://groups.google.com/d/optout.
