Knowledge of E-mark chip

The specifications before Type C (TypeA, TypeB, etc.) focused on the “hard” characteristics of the USB interface, such as the number of signals, the shape of the interface, electrical characteristics, and so on. TypeC adds some “soft” content on the basis of defining the “hard” characteristics of the USB interface. The USB interface (only refers to TypeC) gets rid of the affiliation with USB and becomes a new specification that can be on par with the USB specification . After the USB was upgraded to version 3.1, the physical interfaces all adopt the Type C structure, and the actual 3.1 standard USB Type-C wire structure is not uniform, which caused a lot of chaos. Until 2019, in order to standardize their For functions and electrification performance, the association has set a threshold. If a product wants to support 5A high current, USB 3.0 or higher transmission speed and video output function, it needs to be equipped with an E-Marker chip. E-mark, full name: Electronically Marked Cable, USB Type-C active cable packaged with E-Marker chip, DFP and UFP can use PD protocol to read the properties of the cable, including power transmission capability, data transmission capability, ID Waiting for information, simply speaking, if the Type-C data cable has an E-Marker chip (we call it an electronic label), E-Marker (Electronically Marked Cable) can also be simply understood as an electronic label for the Type-C line. The set functional properties of the cable can be read through the E-Marker chip, such as power transmission, data transmission, video transmission and ID. Based on this, the output terminal can adjust the matching voltage/current or audio and video signals according to the connected devices such as mobile phones or monitors. In the past, E-Marker chips have always been imported. Cypress (Cypress) and Intel have strong E-Marker chip products. Apple once customized the E-Marker USB 4 chip JHL 7040 from Intel to be used on the Thunderbolt interface. In recent years, chips that can support domestic E-maker have also begun to be commercialized in batches and become the mainstream.

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 you must need a TYPE-C interface chip to implement the USB PD protocol.

The second principle of using E-mark: If your device uses 5V voltage, and the current does not exceed 3A. 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 party is HOST, and the power consumer 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 judge whether a TYPE-C chip is needed on the device. Another point that has attracted much attention is whether an E-MARKER chip is needed on the C-C transmission line. This judgment standard is the use process , will the current exceed 3A? If it does not exceed, you don’t need it. The A to C, B to C line depends on whether you need to implement the Battery Charging protocol. If you want to implement it, you can use LDR6013. The advantage is that it can realize both charging and charging. Transfer data to avoid the problem that some adapters that do not comply with the Battery Charging protocol cannot charge Apple devices