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4
USB Power Delivery overview
The USB Type-C and USB Power Delivery specifications allow smarter connectivity with fewer cables, less
connectors and universal chargers. The Type-C connector supports all the features of previous standards, and
ports can be configured to only supply power in a Provider role, only sink power in a Consumer role, or be able to
switch between both in a Dual role.
Both data and power roles can be independently and dynamically swapped using the USB Power Delivery
protocol.
Most automotive applications require support for the Provider role only. When a USB device is connected, the
Provider and the device (Consumer) negotiate a contract for the power objects through configuration channels.
The message exchange between Provider and Consumer are listed below:
1.
The Provider sends a Source Capabilities message to the Consumer, advertising its power
capabilities.
2.
The device then sends a Request for one of the advertised power profiles.
3.
The provider accepts or rejects this request according to its power balance
4.
If confirmed, provider sends as an Accept message to the device
5.
The provider then switches to the requested power profile and sends a PS_Ready confirmation message
Each received message is acknowledged with a GoodCRC to confirm correct reception. Incorrect receptions are
ignored and persistent communication errors should trigger a soft reset to re-establish communication. If the error
persists, a hard reset is performed.
UM2451 - Rev 1
UM2451
USB Power Delivery overview
page 15/22
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