USB C cable wiring diagram

USB C cable wiring diagram
This article mainly introduces the USB C cable wiring diagram, the pin definition of the 24Pin USB Type C interface and how to connect the core wires, as a reference for hardware design

Let's first understand the pin definition of 24Pin USB C



For the USB C cable, we mainly introduce the male connector

It can be clearly seen that the Pin position of the same function is diagonally symmetrical with respect to the center point. After the male connector is inserted into the female connector, the pin function perfectly fits no matter the direction of insertion. Moreover, the power supply VBUS/GND both have 4 Pins, and these 4 Pins can supply power at the same time. This is the main reason why USB C is different from the previous connector and can achieve 5A high current.

Pins function definition

USB C cable wiring diagram

The USB C cable wiring diagram
 is as follows (male to male, only for reference)

Why do 24Pins USB connector use 16 core wires?
Some people may ask, why the 24PIN USB C connector has 24Pins, but the full-featured USB C cable only has 16 cores? This is because 4 VBUS Pins are connected to the same VBUS solder joint on the PCB board, and 4 GND Pins are connected to the same GND solder joint, 8 becomes 2, which reduces 6 solder joints, and B6 , B7 does not actually exist, so that all solder joints add up to only 16, which corresponds to a 16-core wires (24-6-2=16)

How does USB C PCB board actually weld the core wires?
The PCB board of USB C MALE has many different designs. In practice, the position of Pin on the PCB board does not correspond to their position on the interface one by one. The most common is to use both red and black for the power supply (VBUS), and use braiding as GND to solder to the GEN terminal or the inner shielded metal shell, as below

If cables requiring a large current (such as 5A), because the power supply wires are too thick, the original VBUS position cannot accommodate such a thick wires. At this time, the VBUS terminal of the PCB board must be adjusted to both sides of the PCB board, leave enough space for welding the thick power wires, as shown in the figure below