12-15-2016, 11:20 AM
(12-14-2016, 07:21 AM)BenCranston Wrote:(12-11-2016, 12:53 PM)ciclopez Wrote:(12-11-2016, 12:10 PM)BenCranston Wrote: Well, that fully explains the issues I've been having. I'm going to re-route the power over to the EULER bus and test again. I'm worried however that I might have damaged something on the Pine64 by back-powering via the Pi-2 interface...
So, @pfeerick can you comment on @ciclopez assessment of the schematic? Thanks.
So, have you been powering the Pine through the Pi-2 Bus and the microUSB port at the same time? I won't recommend doing that, but maybe the Pine has some protection for that use-case and your Pine could be fine, otherwise the MT3608 or your power sources might have been damaged, or maybe they just overheat.
I just did some measurements on the Pine and providing an input voltage of 4.97V through DCIN, the output voltage in the pins 2 & 4 of the Pi-2 Bus is 5.24V (this comes from MT3608) So I think it won't be possible to bypass the MT3608 by shorting Pins 4 & 8 in the Euler Bus, as the currents flowing from MT3608 to the power source could be of several Amps... unless I'm missing something.
Does anybody have an idea to bypass the power regulator?
Not at the same time, no. I've been pushing 5v in via the Pi-2 bus, but it does not behave correctly. The power source has supervision and can turn off and on the power. there is something on the Pine64 that is causing the switch function to not work correctly, like a momentary dead short... yikes. If I over ride the switching and force the power on, the Pine64 will accept it and boot. however I'm concerned that I'm damaging something. Given the beginning of this thread where the belief was that Euler 5v In was directly connected to Pi-2 bus 5v, I'm starting to think that's not the case.
Later today I plan to re-route the input power over to the Euler bus and see what happens.
Well, I can fully confirm that you CAN NOT use the Pi-2 interface to power the Pine64. You MUST use the Euler Bus (or USB or Battery) to provide external 5v DC in to the board.
Sure hope I didn't damage any components on the Pine64..
