12-29-2016, 07:54 AM
(12-29-2016, 07:11 AM)BenCranston Wrote:(12-29-2016, 06:09 AM)ciclopez Wrote: I've found why some people say it's possible to feed power via Pi-2 and some say it's not. There is a jumper (J9) to bypass the MT3608 power regulator, but only in the Pine A64+ 2GB version, at least in the Rev C. So yes, it's possible in A64+ 2GB Rev C (maybe also in previous revs), but it's not possible in any other version, at least for the moment.
So are you suggesting that back power via the Pi-2 interface is possible if you remove both jumpers? I have the board you are pointing out. My jumpers are, according to the manual, jumped to DC 5V setting. With the board jumpered as shown the MT3608 over heats and the board shuts down if you provide power input via the Pi-2. Power input via the Euler DC IN pins works just fine.
![[Image: Captura_de_pantalla_2016_12_29_a_la_s_13_16_23.png]](https://s24.postimg.org/vz6v1ivit/Captura_de_pantalla_2016_12_29_a_la_s_13_16_23.png)
As far as the schematic is correct, if you remove the jumper it won't work. If your jumper is in DC 5V position (pins 1&2 connected, pins 3&4 disconnected) back powering should work, as VCC-5V becomes the same line as DCIN, and should be the same as providing power through the microUSB port or DCIN pins in the Euler Bus.
I have the A64 512Mb version so I can't test this right now. I will ask to a friend that has de 2Gb version to test it and let you know.
