Comment on USB PD for older device
czardestructo@lemmy.world 1 day agoThat is not correct, you won’t get a random lower voltage. You are correct that thw PD supply needs to support the voltage but PD always starts with 5V for backwards comparability then digitally its negotiates the PD voltage it wants, if it asks for 12v and its not available it with just stay at 5V. It won’t spit out the closest value unless the device asks for it. Its a very strict and wonderful standard.
cmnybo@discuss.tchncs.de 1 day ago
It must be the PD trigger chip that does that then. With every PD trigger module I’ve used, I get a lower voltage if the requested one is not supported. It doesn’t stay at 5V unless that’s all the power supply supports.