E-Mark is the chip of USB Type C which is used for control and CC logic detection. What is the CC logic detection and control? See below.
1. Data cable current need over 3A.
2. Data cable can support USB 3.1 Gen2 (10Gb/s)
Now all kind of device can support to USB3.1 Gen1,in other words, it is just like USB 3.0 vest, speed 5Gb/s.
3. Data cable can run into Alternate Mode
That’s means when the USB Type C data cable run about video input or output some advance function (Such like Display Port), it is same as USB 3.1 Gen2, because of the requested of high speed data transmission rate and protocol check.
At the same time DisplayPort also request use the PD for the power supply, Adding the E-Mark chips can stabilize to the data transfer and current effect.
Therefore, The E-Mark chips has great realistic magnificent, it is one of the cornerstone for Type C.
Of course, now USB 3.1 Gen 1 speed rate and 3A current can satisfy everyone need for a long time. And E-Mark chips have no mass production product to this day. But when Type C need break bottlenecks, the E-Mark chip can spread out with their low cost.
USB association set out many range of adaptor cable, like Type A to Type C, Type B to Type C and Type C to Type C.
As the lighting cable is designed based on USB 2.0+2A，so it is same as normal USB cable，just replace the connector. Personally experience, the original lighting cable strain relief and head parts are easy to break. I don’t know why but it is fact. But for the USB 3.0+ 3A Type C cable, as it with TX/RX+CC+VBUS wires, so it lead their cable OD thicker than others.
Type C cable with 3A, as it is support USB 3.1 Gen 1, so generally they have to adding high temperature, short circuit protection in it.
Data transmission capability
1. Compatible with USB 3.1
Now mass production USB 3.1 Gen1 Type C cable as long as add E-Mark chip, it will be support USB 3.1 Gen2. Tx/Rx transfer wire is prepare for the high speed transmission.
2. Supporting multiple protocols
Type C is not only the all-in-one connector but the whole consumer electronic industry. It is benefit of the prospectively designed. The latest standard of Type C integrated 3.5MM audio transmission, DisplayPort video transmission. And HDMI, Thunderbolt also fuse in. (Lighting, what did you do?)
3. Two-way transport ability.
Type C to Type C can realize the input and output function change. It can make 2 devices transfer the power and data each other.