With its powerful functions, USB Type-C is bound to quickly trigger a revolution in the USB interface under the strong promotion of Apple, Intel, Google and other manufacturers, and will positively affect all aspects of our daily lives. Type C is a new generation of physics. The interface standard, now partners, often discuss a question, whether the USB Type-C device needs CC logic to detect and control the E-MARK chip, and many partners will ask, what we are talking about in the Type c data cable What is E-mark!
E-Marker chip usage scenarios The USBType-C specification defines various types of USB Type-C cables: Full-featured USB Type-C cables: A USB Type-C to Type-C cable that supports USB 2.0 and USB3.1 data transmission Type C cable. USB 2.0 Type-C cable: A USB 2.0 Type-C cable with USB2.0 Type-C male plugs at both ends, suitable for USB2.0. Fixed Type-C cable: a fixed Type-C cable (CaptiveCable) with a full-featured USB Type-C male connector or USB2.0 Type-C male connector at one end (CaptiveCable) The following figure lists the need for an E-Marker Chip cable type:
We comprehensively use equipment configuration and actual market application, and then through the practice guidance of industry predecessors, the summarized answer is as follows, please make a brick! First: If we provide a voltage exceeding 5V or a current exceeding 3A through the USB TYPE-C interface, then the TYPE-C interface chip must be required to implement the USB PD protocol. Second: If your device uses 5V voltage, And no more than 3A current (mainly depending on the power supply characteristics and data transmission characteristics of the device itself), if the device itself only supplies power to the outside, or it 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. The power party is DEVICE, so congratulations, you can save money, you don’t need TYPE-C chip. Of course you can use it at will. Third: The above two are used to determine whether the device needs TYPE-C chip. In fact, we do wire Our partners are more concerned about whether the C TO C CABLE needs to use E-MARKER chips. This judgment standard, personal opinion, can be free to shoot bricks, the current exceeds 3A, use E-MARKER chips, don’t waste money if you don’t exceed it. In addition, the lines of A TO C and B TO C depend on whether the Battery Charging protocol needs to be implemented. If you want to achieve it, you can use the chip. The advantage is that it can achieve charging and data transmission, which can avoid some The problem that adapters that do not comply with the Battery Charging protocol cannot charge Apple devices!