"Tim Watts" wrote in message
...
On 29/05/15 11:59, Simon263 wrote:


"Tim Watts" wrote in message
...
On 29/05/15 11:10, Simon263 wrote:


http://en.wikipedia.org/wiki/USB#USB_type-C


"Full-featured USB type-C cables are active, electronically marked
cables that contain a chip with an ID function based on the
configuration data channel and vendor-defined messages (VDMs) from the
USB Power Delivery 2.0 specification. "

Hang on - is this the same stupid ******** that stops me powering my
Dell laptop from a generic PSU?

No, nothing like that.

In which case, seems like a total own goal - you need to carry the
device and its lead (not any lead) as well as the generic but beefy
enough for everything PSU?

Nothing like that either.

or is this always going to work:

"or they can support the full Power Delivery specification using both
BMC-coded configuration line and legacy BFSK-coded VBUS line."

No reason why not.

So any idea what the "chip" is for?

Basically so the system can work out what current is available
and can indicate what currents it can use for charging.

Currently USB charging is done using a number of ways of
signalling that stuff by DC levels on the data lines and that
is done differently by Apple and by androids and by at least
one other system. The chip gets rid of that proprietary stuff.
http://en.wikipedia.org/wiki/USB#Power