Pogo pins power clarification - reading schematics
02-14-2021, 04:09 PM
(02-14-2021, 03:29 PM)dsimic Wrote: In the meantime, please have a look at the PineEye schematic, which uses the pogo pins. It simply takes power from both USB-5V and DCIN pogo pins, again with no isolation (yikes!), and uses a separate 3.3 V regulator.
Wow! Yeah, that doesn't seem right.
Maybe the R7 and R8 are "jumpers" because you're supposed to populate which one you want to use? Yeah, based on all the time we've spent analyzing this, I personally would never short DCIN and USB-5V together like that :-)
That BOM also lists R6, R7, and R8 as "jumpers", which I take it means 0-ohm resistor. I hope that you're supposed to only populate one or the other of R7 or R8, or else I hope that we're wrong about how the pogo pins work.
(02-14-2021, 03:29 PM)dsimic Wrote: Obviously, PineEye uses 3.3 V for its power supply voltage, which requires it to use a separate buck regulator. However, some other "pogo mod" requiring 5 V as the power supply voltage would also have to use a separate buck/boost 5 V regulator, which IMHO raises some questions about the phone design.
Yeah! So no matter if you're using 3.3 V or 5 V, you still have to use your own regulator, because you don't know what voltage you're actually going to get. ha
