I measure 3.3V on P9.3. USB powering shows the 'good' powercycle, 5V via P9.5 shows a 'bad' powercycle.
Btw, I seen that in revision A6 and A4 there is an NCP349 chip between VDD_5V and pin 10 of the TPS65217b, which I cant see in revision A5. On Thursday, March 20, 2014 2:52:43 PM UTC+1, Gerald wrote: > > Where are you looking exactly? > > Gerald > > > > On Thu, Mar 20, 2014 at 8:51 AM, Kees k <[email protected]<javascript:> > > wrote: > >> >> >> The 5V is fine (maybe a little spike of 0.8V after 60 ms PS). >> >> However, the 3.3V gives a strange 2-stage powerup cycle. I compared a >> revision A5C to a revision A6, see plots below. >> >> As can be seen the A5C has a 'normal ' powerup cycle on the 3.3V, but the >> A6 a 2-stage powerup cycle. May this cause any problems with PHY? >> >> >> >> >> <https://lh6.googleusercontent.com/-oYQffwcsuTE/Uyrx4haRJUI/AAAAAAAACC8/cW3xQual_Q8/s1600/20140320_143534.jpg> >> >> >> <https://lh3.googleusercontent.com/-_veLX8dOp6w/Uyrx2A6EsRI/AAAAAAAACC0/fOMrXaeqSfE/s1600/20140320_142321.jpg> >> >> >> On Thursday, March 20, 2014 2:44:33 PM UTC+1, [email protected] wrote: >>> >>> Robert Nelson <[email protected]> wrote: >>> > On Thu, Mar 20, 2014 at 4:48 AM, Kees k <[email protected]> >>> > wrote: >>> > > I have seen this problem repeatedly by A6 revision hardware, but not >>> with >>> > > revision A5C hardware (I am running exactly the same software on >>> both). >>> > > >>> > > Noteworthy is that the "PHY problem" only appears when powering the >>> BBB via >>> > > the headers. Powering via USB does not give any problems. >>> > >>> > Well, if it works via USB, but not with the headers. (I didn't check >>> > if the Ethernet can be powered from the headers.) >>> > >>> I'm powering my BBB using P9 pins 1/2 for 0v and 5/6 for +5v, I'm >>> using the 'real' ethernet connection and it works fine. It has run >>> with no problems for at least 24 hours, staying connected (ssh) to my >>> desktop computer. >>> >>> -- >>> Chris Green >>> ยท >>> >>> -- >> 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:>. >> 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.
