PinePhone Keyboard update [April 24/04]

[megous]

Looking good, Just wondering about charging, is the charging speed from the keyboard to the phone, any different than using the usb-c port in the phone?

If I plug the usb-c port in the keyboard will it charge faster than the usb-c port on the phone, will it charge the same, or slower because the charge has to go through the pins when getting to the actual phone?

Does the speed depend on what battery it's charging? If I'm charging the keyboard 's battery because the pinephones battery is full, would the keyboard charge faster if I plugged it in using the keyboard slot, and the same if I'm charging the pinephone's battery rather than the keyboard, would it charge quicker using the pinephone slot, or the keyboard slot, or is it all virtually the same?

Thank you!

I would expect the battery in the keyboard to be chargeable at 0.5C, so ~2.5A/5V. That would consume most of the available power from a typical USB-PD charger (assuming the charging circuit will use 5V). There would be some 2.5W left for the use by the phone itself, which is so so for use but not for charging.

The rest is anyone's guess at this point. Anyway, I don't think keyboard charging circuitry can control when the power gets to the phone all by itself. It would be best for usability if both charging controllers were controlled by the SoC somehow. Otherwise there will be a plenty of weird edge cases.