Thanks for your reply. I have scoped my regulator output and it shows a steady 5.38 +- 0.05 V. Besides the power pins, I only have connections to P9_19 and 20 to use i2c2 bus. The thing that really worries me about this board is that when I remove all connected items, and attempt to power with the USB only the behavior is unchanged. (faint flash of power led then nothing)
In my system I have i2c from the BBB communicating with an arduino which controls a stepper motor. That's it. In my mind this is fairly simple. I'm not sure how I could have killed the BBB this way. Should I just try to RMA the BBB? I know it is difficult to diagnose the issue without seeing the specifics of my setup so I appreciate your help. On Wednesday, April 24, 2019 at 10:28:32 PM UTC-4, [email protected] wrote: > > The single blink means that the Power Management Chip is going into self > protect. > > You need to put a scope on the output of your regulator and see what is > going on. > 5.3 V will not fry the BBB. > It would run fine from a 5.3 V supply that never went above 5.5V > But it will respond the way you describe to short transients that go above > 5.5 or below 4.5. > There is also a rise time spec on the start up Voltage rise. > > Or, it could mean that something else did fry the board, such as a blown > I/O pin, which is causing an over current protect on the part of the power > management chip. > > The single blink does not tell you what is wrong, just that something is > wrong, and the power management chip is still alive and doing its job. > > --- Graham > > == > > > On Wednesday, April 24, 2019 at 3:31:04 PM UTC-5, [email protected] > wrote: >> >> Hi There, >> >> I have been working on a project using a beaglebone black which I am >> trying to power with a 3-cell LiPo battery. To do this, I have connected >> the output of a hobbywing ubec 5V-3A voltage regulator to pins P9_5 and 6. >> This seemed to work well for a while, but just now the BBB abruptly turned >> off and will not turn back on. I have tried disconnecting everything from >> the BBB and connecting it to my PC with the USB cable. This results in a >> quick, faint flash of the PWR led followed by nothing. Pressing the power >> button with the USB cable plugged in yields the same behavior. I just >> tested the voltage regulator output and my voltmeter reads 5.3 V. My >> understanding is that the BBB requires a well regulated 5 +- 0.25 V power >> input. So technically my power supply is 50 mV above the limit. Is it >> possible that I have fried the board by doing this? Is there any way to >> recover it without buying a whole new BBB? Thanks in advance for your help! >> >> >> -- 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/3cf14fe5-5c23-4ed1-be01-480994fad7ac%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
