Certain SoCs can support USB and DisplayPort and the muxing required for Type-C. The systems that use this architecture may need a re-driver to ensure signal signal integrity to from the SoC to the Type-C connectors. Generally the SoC is controlled through I2C and must be connected to the I2C1 Master on the TPS65988. A re-driver can be controlled through GPIO or I2C. The Embedded controller is connected to the I2C2 Slave on the TPS65988. Figure 9-9 shows the SoC controlled though I2C and the Re-Driver controlled through GPIO. Figure 9-10 shows the SoC & Re-Driver controlled though I2C. The TPS65988’s two internal power paths provide VBUS which is taken from the System 5 V for Port and will control the external sink path to charge the system through USB PD. The System 5 V will also power PP_CABLE1/2 on the TPS65988 to supply VCONN to Type-C e-marked cables and Type-C accessories. An embedded controller EC is used to communicate to the TPS65988 for additional control and to relay information back to the operating system. An embedded controller can control additional features such as entering and exiting sleep modes, changing source and sink capabilities depending on the state of the battery, UCSI support, control alternate modes, etc. Refer to the Host Interface and Firmware users guide for additional information.

Figure 9-9 TPS65988 and SoC I2C with Re-Driver GPIO

Figure 9-10 TPS65988 and SoC & Redriver I2C