On Wednesday, 29 April 2015 14:00:17 UTC+2, Andrew Bradford wrote: > > You seem to be talking about the BBB, correct? >
Correct, though it seems nearly all posts in this thread are referring to the BBB issue? My initial work was on BBW back in 2012 (prior to BBB release). > > It sounds like BBB has similar issues to BBW with running on battery but > that the issues are slightly different. > Well the similarity is that the regulator was being kept alive by leakage currents. Your original question is actually very easy to answer: disabling 3V3A like you were is really really not allowed, and if leakage currents didn't keep it logic-high then the result would have been pulling nRESET low, game over. Shutting down 3V3B is something you may be able to do if appropriate pad configuration is done (high-Z with receiver disabled, pull-up disabled, maybe pull-down enabled) depending a bit on the rest of the BBW schematic (I didn't study it in any detail), but that doesn't help you since it doesn't control 3V3EXP. Bottom line: shutting down 3V3EXP on the BBW (other than in off-state or rtc-only sleep) is not going to happen without a hardware patch. -- 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.
