I did not use the NCP349 on the BBB. What board are you looking at? Gerald
On Thu, Mar 20, 2014 at 8:58 AM, Kees k <[email protected]> wrote: > 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]> 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]. >>> >>> 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. > -- 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.
