this post was submitted on 24 Nov 2024
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I don't think this is right. The PD standard requires the negotiation of which side is the source and which is the sink, and the voltage/amperage, over those data links. So it has to at least support the bare minimum data transmission in order for PD to work.
Technically, yes, data must transmit to negotiate, but it doesn’t require high throughput. So you’ll get USB 2.0 transfer speeds (480 Mb/s) with most “charging only” USB-C cables. That’s only really useful for a keyboard or mouse these days.
This limitation comes up sometimes when people try to build out a zero-trust cable where they can get a charge but not necessarily transfer data to or from an untrusted device on the other side.