As I said in the original post, the bench supply is capable of more than 3A...far more than the BBB takes. I've duplicated the problem on 2 difference bench supplies and with multiple BBBs (ie the problem is not specific to one particular BBB board).
J- On Friday, December 13, 2013 10:49:07 AM UTC-5, Kees k wrote: > > Hey, did you try another power supply? Probably the PS has problem > supplying the current and drops voltage? Or there is a current limitation. > > I tried to reproduce by only connecting P9.5, P9.6 and P9.1 (GND) , but > could not. > > On Tuesday, November 19, 2013 2:00:55 AM UTC+1, James Littlefield wrote: >> >> New to BBB but experienced with embedded systems. >> >> I'm working on a project using the BBB. Supplying +5V (up to 3A) >> directly to the pins on P9 from a quality bench supply. I've found that >> briefly switching the +5V supply OFF and then back on can pretty reliably >> leave the BBB in an odd state characterized by... >> a) No LEDs on >> b) Very little current drawn from supply (10mA or less) >> c) +5 present on P9.5 and P9.6 >> d) 0.687V on P9.7 and P9.8 ( should be SYS_5V ). >> e) P9.9 = 3.57V >> f) P9.10 = 0V >> >> I've found that once the system is in this mode no amount of >> pressing/holding the momentary BBB pushbuttons will get the system working >> again. Removing input power, waiting 10 sec or so, then restoring power >> will get things working again. >> >> Has anyone else seen this? It seems sort of like an issue with >> the TPS65217C chip but I've not found any reported errata on that part. >> >> Thanks >> Jim >> >> >> -- 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.
