Any chance you can give some more information, like the revision of the board and details on the power supply?
Gerald On Fri, Apr 25, 2014 at 6:22 PM, <[email protected]> wrote: > Hi, > > A couple of my BBBs have begun to not respond or intermittently not > respond to the 5V supply, i.e. VDD_5V, but still are able to be powered > through the USB. When in this state the board does not appear to respond at > all to 5V power, no power or status LEDs. When I first noticed the problem > I found that they would eventually return to normal operation if all power > was removed for an undetermined period of time. > > > These devices are setup as remote systems that power up periodically via > an external RTC, which momentarily pulls PWR_BUT to ground in order to turn > the device on. They are powered through VDD_5V via a custom cape, as such, > the error I’m seeing effectively breaks the function of my device. > > > I don’t know what’s causing this error, but assume that it’s something > related to the PMIC. I believe I’ve only seen this issue on RevB BBB’s but > the PMIC is the same for both the RevB and RevA boards that I have. I’ve > also seen various levels of current draw from VDD_5V when in this state, > ~18.5mA in one case and ~0.39mA another time. I was wondering if the PMIC > might be in some lockout mode, I know there is an “Under Voltage Lockout” > mode. However, I haven’t figured out a good way to test this. > > > Any suggestions to help debug this issue would be greatly appreciated. > > > Thanks > > jay > > -- > 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.
