5 ms·
USB-C charging relies on negotiation between both sides. A laptop charger can supply 20+V if it determines there's a high-power device on the other end. I'm not
by gargravarr 7y ago
USB-C charging relies on negotiation between both sides. A laptop charger can supply 20+V if it determines there's a high-power device on the other end. I'm not particularly trusting that a cheaply-made power supply won't hit the wrong condition on a case statement and supply 20V to my phone.
Implementing USB-C wrong seems to be a passtime of all major manufacturers now. Nintendo got it almost completely wrong with the Switch. The RPi 4 is also wrong, as it bridges two connectors that shouldn't be and identifies itself as an audio device to some adapters. The whole ecosystem is a farce and I wouldn't trust it as far as I could throw it.
- mceachen 7y agoIt's worse. Both sides need to negotiate properly, and the cable needs to follow specs, which many don't. Where micro USB has QC and QC2, there's a whole suite of PD (power delivery) and data protocols that cables may or may not support. https://www.theverge.com/2015/11/5/9674462/usb-type-c-google-engineer-third-party-cables https://www.theverge.com/2015/11/5/9674462/usb-type-c-google... is dated coverage of a Google engineer testing for out-of-spec cables. See also: https://twitter.com/laughing_man https://twitter.com/laughing_man.
- Yizahi 7y agoI already encountered such cable. Red cables from Oneplus phones rated for dash charge tech (5V, 4A) won't charge regular phones (e.g. Samsung A8), despite being rated for higher current.
- avian 7y ago> The RPi 4 is also wrong, as it bridges two connectors that shouldn't be Do you have a link or some more info on that?
- gargravarr 7y agohttps://www.scorpia.co.uk/2019/06/28/pi4-not-working-with-some-chargers-or-why-you-need-two-cc-resistors/ https://www.scorpia.co.uk/2019/06/28/pi4-not-working-with-so...
- avian 7y agoNice. Thanks a lot!