Basically I’m trying to de-clutter the cables to my charging station, and was hoping to use a 3-way cable for my phone, watch, and headphones.
My main concern is if one device is able to successfully negotiate QuickCharge or PD, would that send 9-20 volts to the other devices?
e.g. if I grabbed the wrong cord and hooked it into my laptop, the laptop requests 20v, would that PD negotiation succeed and also send 20v to my 5v devices on the other two leads?
I’ve only used these kinds of cables with USB-A and chargers that can only output 5V. Most of my chargers now are QC/PD so I’m curious if I should avoid those or take any particular precautions.
That’s what I was thinking (basically assuming they lack the CC wires/pins to negotiate power delivery), but the listing does say one of the leads does support data transfer which made me wonder. I’m assuming they share the VCC and ground so if the data-capable one triggered a higher voltage from the charger, then they all would get the same output voltage.
I’m not sure how QC is negotiated, but it doesn’t seem to need any extra pins like Power Delivery, so I still wonder about that.
Does someone make a plug that you can stick on a cable that will identify its capabilities? If they don’t, they should.
I bet Fluke will sell you one for $900
I think those do exist, but I don’t have one.
Like this?
I don’t have one of those, but I do have one of these to test USB C power supplies. It will also test the cable you have connected to see if it’s emarker says it’s rated for various things. But it doesn’t actually test that those things work.