Pogo pins power clarification - reading schematics
02-14-2021, 03:29 PM
I'll need some time to go through your response in detail. 
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.
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.
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.
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.
