ČSN EN 62680-1-2

This specification defines how USB Devices may negotiate for more current and/or higher or lower voltages over the USB cable (using the USB Type-C CC wire as the communications channel) than are defined in the [USB 2.0], [USB 3.1], [USB Type-C 1.2] or [USBBC 1.2] specifications. It allows Devices with greater power requirements than can be met with today's specification to get the power they require to operate from VBUS and negotiate with external power sources (e.g. wall warts). In addition, it allows a Source and Sink to swap power roles such that a Device could supply power to the Host. For example, a display could supply power to a notebook to charge its battery. This specification defines mechanisms to discover, enter and exit Modes defined either by a standard or by a particular vendor. These Modes can be supported either by the Port Partner or by a cable connecting the two Port Partners. The specification defines mechanisms to discover the capabilities of cables which can communicate using Power Delivery. This specification is intended as an extension to the existing [USB 2.0], [USB 3.1], [USB Type-C 1.2] and [USBBC 1.2] specifications. It addresses only the elements required to implement USB Power Delivery. It is targeted at power supply vendors, manufacturers of [USB 2.0], [USB 3.1], [USB Type-C 1.2] and [USBBC 1.2] Platforms, Devices and cable assemblies.