Is there a way to detect if there is a USB cable physically inserted into a USB receptacle, even if it is just a cable (with nothing attached to it).
I am designing a USB charging port (short D+ and D- together styles) and would like to be able to disable the buck converter if there is nothing plugged into the USB receptacle (which will be >99% of the time).
I can't rely on the devices that will be drawing power from the receptacle to have any specific protocol in terms of negotiating charging current etc (i.e. can't use serially transmitted data from device X as a detection mechanism).
I think what I'm asking for is if there are USB-A receptacles with mechanical plug-in detection (along the lines of what is available for SIM cards and SD cards), or if there is a way of "sensing" a plug-in event transient (less inclined to go this route as it sounds pricey).
What say you?
EDIT: Found a receptacle with a "contact sense pin" feature that was referenced in another post: