2.2.1 CC Resistors and Devices

USB Type-C requires components on the Configuration Channel (CC) lines to identify devices. The CC channel allows devices to detect the orientation of the cable and to detect (or request) power from the host.

On the device side, a 5.1 kΩ resistor is usually connected between each CC line and GND to indicate that a device is plugged in and connected. The device can monitor the voltage across this resistor to determine the current limit available. In some cases, such as USB Power Delivery (USB PD), an active circuit takes the place of the resistor to communicate with and negotiate power with the host and cable.

Note: Advanced implementations, such as USB PD, are outside the scope of this document.

The host may not detect a plugged-in device and thus not provide power if the CC lines are configured incorrectly.