2013/12/29 Charles Steinkuehler <[email protected]>: > On 12/28/2013 1:52 PM, José Luis Redrejo wrote: >> El 28/12/2013 16:55, "Zachary Thorson" <[email protected]> escribió: >>> >>> Do you have a multimeter or scope you can use to watch the voltage going >> to the board? I wonder if the regulator isn't supplying quite enough over >> time. >>> >>> Zach >>> >>> -- >> >> Yes, I have checked it and the voltage is correct. >> There must be a lack of current problem. Feeding the regulator with a 9 >> volts battery, it works. If I plug the transformer with the diode bridge it >> blinks for some seconds and stays off. > > In addition to the average value of 5V, the BeagleBone needs a stable 5V > value that doesn't have large swings away from the 'typical' 5V value or > the on-board power controller will go into under- or over- voltage > lock-out mode and the system will shut down. > > Put a 'scope on your 5V and make sure it's clean. > > --
I've seen with the scope a 30 mV peak-to-peak ripple, I didn't think this could cause problem, but could this ripple be enough to enter in lock-out mode? -- 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/groups/opt_out.
