According to USB-IF requirements, charging cables with power supply capacity of 3A and above must have a built-in E-marker chip, so if the manufacturer advertises that it has a built-in E-marker chip in the product details, it means that its power supply capacity for the public PD protocol is 5A, and the power supply capacity of the private protocol is subject to the actual advertisement.
At the same time, the maximum voltage of the charging cable is also indicated in the chip. Length, supported data transfer capacity.
For example, Xiaomi 6A CC cable, the program from Xiaomi, the maximum voltage of 20V, the maximum current of 5A (the maximum current here refers to the maximum current to support the public protocol, not the maximum current to support its own private protocol), length 1m, data transmission specifications USB 2.0.
If the charging cable must not detect the E-marker chip, it indicates that the maximum power supply capacity of the charging cable is 3A, which is the case with the Apple 60W charging cable.
