> > As the beaglebone is only 3.3v tolerant, and the ADC pins have a max > tolerance of 1.8v.
Should read: Most pins on the beaglebone are only 3.3v tolerant with the exception of the ADC pins which are only 1.8v tolerant. On Sun, Feb 5, 2017 at 7:30 PM, William Hermans <[email protected]> wrote: > Micael, > > For good measure, you should be aware that pins that are connected to > external hardware. Should be isolated if those pins, and hardware are > powered up before the beaglebone. I would think that if the beaglebone it's > self is powering these external circuits, and hardware. Then this would be > less of a problem. > > Additionally, I've had more than one beaglebone come across my "desk" in > the last 4 or so years. One in particular is possibly form the first batch > sold to the public. e.g. ~4 years old. I have heard people saying that if > you pull the power, while the board is running, that the processor can be > damaged from this action. I'm not saying to is false, I am just saying that > it would probably be a fairly rare issue. As I've been in a situation where > I've had to do exactly that, many times. As far as corrupting the operating > system. It is possible, as with any operating system. But again, it's a > fairly rare situation. You're just as likely to corrupt the system by > installing an application, updating the system, or flashing an new image to > the eMMC. > > So there is one thing I have not seen you mention if you've attempted this > or not. Sometimes, the board needs to have the reset button pressed, before > it will power up again. I've run into this a few times myself, and like you > I was nearly convinced the board was dead. No power lights coming on. even > after completely disconnecting the input power several times. I also power > my own personal beaglebones the same way you do. Via USB. Anyway, I'm not > saying this will fix your problem. but it is worth looking into. If in > doubt which button is reset, it probably would not hurt for you to just > press both of the button to the right of the ethernet jack, with ethernet > jack oriented at the top of the board. > > Anyway, if you care for a much better "analysis" of what happened, and how > to avoid the same in the future. It would behoove you to tell us exactly > how many pins you had connected to your external hardware. What kind of > periphery, and how much current source/sink + voltage levels. As the > beaglebone is only 3.3v tolerant, and the ADC pins have a max tolerance of > 1.8v. > > On Sun, Feb 5, 2017 at 6:38 PM, William Hermans <[email protected]> wrote: > >> Or as Gerald already eluded to in his first post. Voltage levels on the >> GPIO's, or other periphery was too high. >> >> On Sun, Feb 5, 2017 at 5:18 PM, Dennis Lee Bieber <[email protected]> >> wrote: >> >>> On Sun, 5 Feb 2017 07:55:47 -0800 (PST), >>> [email protected] declaimed the following: >>> >>> >It doesn't flashes, no light at all.. during operation it went down. >>> The BeagleBoard doesn't show up any longer as a hard drive. I connect via >>> the micro USB port, and that is the only power source for the board. >>> >>> If the unit is driving any other hardware, I'd be concerned >>> about the >>> power supply... USB is normally only rated for 5V 500mA max (normally >>> that >>> 500mA is distributed among up to four sockets of a hub). >>> >>> However... "during operation it went down" is too vague to really >>> comment upon... Failure points could be the USB to PMIC, the PMIC itself, >>> or something later. A short between almost anything could draw more power >>> than the USB could provide. >>> >>> Also, if that unit is running normal Linux (rather than a totally >>> custom embedded application), then shutdown should NEVER be done by just >>> pulling the power... Pulling power could lead to a corrupt file system >>> (though a corrupt file system won't affect the power LED, and maybe not >>> even the status LEDs. >>> -- >>> Wulfraed Dennis Lee Bieber AF6VN >>> [email protected] HTTP://wlfraed.home.netcom.com/ >>> >>> -- >>> 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]. >>> To view this discussion on the web visit https://groups.google.com/d/ms >>> gid/beagleboard/2sff9c9cnbgt4amu00s1j4r8bdtghojqsb%404ax.com. >>> 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORq%3DHSrA224B_gYXEpowMYnVHCizqh1zLZJ1NeGE1qCvwA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
