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> Why should it matter what kind of accessory it is used in? I suspect you're misunderstanding what they mean by "audio accessory". They don't mean "a standar

> Why should it matter what kind of accessory it is used in? I suspect you're misunderstanding what they mean by "audio accessory". They don't mean "a standard digital USB device that happens to do audio-related things". USB-C has a special-case allowance to drive analog audio signals through the port (to allow all-analog headphones and such) that has its own CC configuration. >> Each CC gets its own distinct Rd (5.1 kΩ), and it is important that they are distinct. > Why? Because of the above; if the CCs use the same Rd, they're shorted together by definition, which isn't allowed to happen. Especially since the USB-C format uses the CC's to determine plug orientation.

dTal 7y ago
>USB-C has a special-case allowance to drive analog audio signals through the port Wat. Just when I think I've heard it all...
- floatboth 7y ago
  You've seen the Type C - 3.5mm headphone dongles right? They're so tiny and cheap.. did you think they could be active? :)
  - deleted 7y ago
    [deleted]
- cesarb 7y ago
  USB-C tries to be one universal standard that covers everyone's use cases (https://xkcd.com/927/ https://xkcd.com/927/). Some phones used non-standard modes in their USB connectors which output analog audio in the USB pins, to be used with a passive adapter to a 3.5mm socket. So USB-C added, in an optional appendix, a standard mode for that use case. It's completely optional, so you only have to implement it if your device wants to output analog audio in the USB connector, or if your device is one of these passive adapters from USB-C to a 3.5mm socket.
- TylerWard 7y ago
  There is also a debug mode that manufacturers can use to send arbitrary debug data connections on the usb-C connections. (manufacturers used to do this over microUSB as well)