Pogo pins power clarification - reading schematics
03-14-2021, 08:29 PM
(This post was last modified: 03-14-2021, 10:06 PM by bokomaru.
Edit Reason: wording
)
Tying up a loose end, regarding "doesn't stay powered off"...
I can reproduce either behavior, depending on which type of device I connect to the phone's USB C port.
Phone -> USB C to A cable -> old "dumb" power brick -> AC wall outlet: Connecting the first time causes the phone to power on. But I can power the phone off from software, and then it stays "off".
Phone -> convergence dock -> USB C to a cable -> old "dumb" power brick -> AC wall outlet: Connecting the first time causes the phone to power on. After powering off the phone from software,
the phone powers back on; won't stay "off".
Maybe that's related to this, i.e., maybe the phone powers on by design, so that USB-PD can be negotiated if applicable.
I also remember reading that, for similar reasons, while charging, Android phones tend to be booted up. At least into the bootloader, and then the bootloader maybe knows to enter a different "charging indication" mode or to "stop here" until X or Y event happens.
Anyways, my point is that either of the two conflicting observations can happen, depending on which hardware you connect. If you want to reproduce my "off" test cases, try using a "dumb" brick without USB-PD.
(If anyone wants to talk about more about this aspect, unless it's related to pogo pins, please consider taking it to a new thread)
(02-14-2021, 11:00 PM)dsimic Wrote: Hmm, something is either wrong there, or I'm missing something. As we know, as soon as a charger is connected, the phone powers on, so it would be pretty much impossible to measure the effects of connecting a charger while the phone remains powered off.
(02-28-2021, 03:37 PM)bokomaru Wrote: Nothing wrong there. Connect the charger, let the phone power on, then shut it down from software. Leave the charger plugged in, and ta da! You're charging while the A64 is off.
(03-01-2021, 12:24 AM)GregH Wrote: Another side effect is that the device will not stay off with DCIN powered - no charging while switched off, it keeps booting up again :-(
I can reproduce either behavior, depending on which type of device I connect to the phone's USB C port.
Phone -> USB C to A cable -> old "dumb" power brick -> AC wall outlet: Connecting the first time causes the phone to power on. But I can power the phone off from software, and then it stays "off".
Phone -> convergence dock -> USB C to a cable -> old "dumb" power brick -> AC wall outlet: Connecting the first time causes the phone to power on. After powering off the phone from software,
the phone powers back on; won't stay "off".
(03-14-2021, 07:42 AM)megous Wrote: anx7688 doesn't do anything unless the pinephone is powered on, so there's some fun to be had when charging via USB-PD chargers when the phone is off.
Maybe that's related to this, i.e., maybe the phone powers on by design, so that USB-PD can be negotiated if applicable.
I also remember reading that, for similar reasons, while charging, Android phones tend to be booted up. At least into the bootloader, and then the bootloader maybe knows to enter a different "charging indication" mode or to "stop here" until X or Y event happens.
Anyways, my point is that either of the two conflicting observations can happen, depending on which hardware you connect. If you want to reproduce my "off" test cases, try using a "dumb" brick without USB-PD.
(If anyone wants to talk about more about this aspect, unless it's related to pogo pins, please consider taking it to a new thread)
