Comment on i have a problem with USB c charging đ
litchralee@sh.itjust.works â¨9⊠â¨months⊠ago
Two things come to mind with USB C charging thatâs usually different than micro USB or prior standards. First is that some USB C circuits are tightly coupled to battery charger circuitry. The idea is that if the pack voltage is higher than standard 5v, then it may be advantageous for USB C to request one of the higher voltages from the wall-power block. But I think this is unlikely, if the photo youâve included is of the board in question; there would usually be the leads for the battery pack attached to the same board.
Second, USB C â unlike every other USB spec preceding it, I think â requires the sense resistors on the consume side before any power is supplied, even low-current 5v that we would otherwise expect. Whatâs probably happening with the LED becoming lit is that itâs probably indicating a data connection, as if you connected to a computer.
DNOS@lemmy.ml â¨9⊠â¨months⊠ago
Thanks your comment is really helpful I will dig into the link you send tomorrow ⌠In the meantime what is the likely solution to find a resistor and permanently solder it on the problem is that I would like to keep both USB and wireless charging options ( I donât think it has any data capabilities) again thank you so much for your answer
litchralee@sh.itjust.works â¨9⊠â¨months⊠ago
You might try the resistors first, although in such a way that it could be removed if that doesnât work. If you have correctly found the D+ and D- lines broken out from the USB C connector, and added resistors to those, I canât see how that would cause an issue with the wireless charging; they should be mostly independent, since if thereâs no USB power supply attached, the resistors wonât be sensed anyway.
DNOS@lemmy.ml â¨9⊠â¨months⊠ago
Hey Iâm just scratching the surface of how deep this topic really is, I have read some articles and at this point Iâm really confused, if I plug the USB cable in and search for 5v pads what will I found the vbus line which at the moment is the cc ? Or the d+ with the bc1.2 ? And how do I know what standard is it using at the moment ? Anyway from the wireless charger I only get 3 cables out 5v gnd and ID (keep in mind I have bought wireless chargers with the lightening plug because I wasnât aware of such a complicated standard and they were cheaper anyway since now it doesnât work I will bui proper USB c Qi chargers ⌠) So as I understood I should add a 5.1 k resistor because the charging board is expecting a pull down but I didnt get where ⌠On the cc line ?
litchralee@sh.itjust.works â¨9⊠â¨months⊠ago
I will note that Iâm not an expert in the plethora of USB charging standards. Quite frankly, USB C is almost like black magic to me. With that said, finding the D+ and D- lines might be tough unless youâve got a USB C charging cable youâre willing to cannibalize.
That is, what you can do is carefully splice into such a cable, then connect it to the board and a USB charging block. By probing the wires, you can rule out the power wires, which should leave you with the D+ and D- wires. You would want to do this with a cable thatâs meant only for changing, such as USB C to USB A. That way, there would only be four wires inside. If you cut open a USB C to C cable, youâll have a lot more wires that you have to check.
Once you identify the D+ and D- this way, you can then do continuity checks from those wires to various pads on the board. In this way, youâll eventually find your D+ and D- pads, and can then add your temporary resistors, to see if that works.
As for identifying the USB charging spec in use, thatâs going to be tougher. I think there are test devices that take the place of a USB charger and can display or change the spec, but Iâve never used such a thing.