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.
