The first principle of using E-mark: If you want to provide a voltage exceeding 5V or a current exceeding 3A through the USB TYPE-C interface, then a TYPE-C interface chip must be required to implement the USB PD protocol.
The second principle of using E-mark: If your device uses 5V voltage and does not exceed 3A current. It depends on the power supply characteristics and data transmission characteristics of the device itself. If the device itself only supplies power to the outside, or only accepts power from the other party, and the power supply role and data transmission role are matched by default (that is, the power supply is HOST and the power user is Slave or device), then you don't need a TYPE-C chip.
The third principle of using E-mark: These two principles are used to determine whether the TYPE-C chip is needed on the device. Another point is whether the E-MARKER chip is needed on the CC transmission line that is very concerned. The criterion for this judgment is the use process In, will the current exceed 3A? If it does not exceed, you don’t need the lines of A to C and B to C, depending on whether you need to implement the Battery Charging protocol. If you want to achieve it, you can use LDR6013. The advantage is that it can not only achieve charging, but also Transfer data to avoid the problem that some adapters that do not comply with the Battery Charging protocol cannot charge Apple devices.