Configuration Channel (CC) lines are the most important lines in terms of Type-C and PD communication. These lines are responsible for all the Type-C and PD negotiations between the devices. A Type-C/PD port has two CC lines, CC1 and CC2. Only one of the CC line is used for communication when a Type-C device is connected. The remaining CC line converts into VCONN to provide 5-V power to the cable electronics if applicable. VCONN current of up to 600 mA of is supported when Ra is presented. However, in a device with captive cable, the CC line and the VCONN is fixed. The cable is hardwired on one of the end; therefore, high speed signal muxing is not required.

Ensure the CC lines of the PD Controller are directly connected to the Type-C receptacle. Avoid any passive components such as 0-Ω resistance between the CC pin in the PD chip and the CC pin in the Type-C receptacle. CC lines have a stringent eye-diagram requirement and a capacitor is placed between CC line a ground to meet the eye-diagram requirements. The value of these capacitors should be tuned if there is any failure seen on the CC eye-diagram. Refer to the data sheet to find the right value of capacitor to be placed between the CC line and ground. Place the PD controller close to the Type-C receptacles to avoid voltage drop in long traces.