USB is a standardization and simplification of electronic computer peripheral equipment connection socket, and its specifications and models are formulated by Intel, NEC, Compaq, DEC, IBM (), Microsoft (Microsoft) and Norterntelecom.
Another significant advantage of USB is that it is suitable for hot swapping, that is, during operation, it can safely connect or disconnect USB devices to complete a true 1394 connection.
At this stage, although USB equipment has been widely used, USB2.0 sockets are more common, and its transfer rate is 480mbps per second. It is about 40 times that of the USB1.1 specification. The greater benefit to customers of increasing the speed is that customers can use more efficient peripheral devices, and peripheral devices of various speeds can be connected to the USB2.0 route without worrying about the bottleneck effect of data transmission.
Universal Serial Bus (English: Universal Serial Bus, referred to as: USB) is a serial bus specification that connects computer software and peripheral devices, and is also a technical standard for I/O ports; research must be added, and products must be verified by research, but no copyright is required. According to the transmission rate, it is divided into USB: 2.0, USB: 3.0, USB: 3.1 and USB4; USB3.1 and USB4 (alias typec) can transmit data, transmit sound, image and battery charging. The maximum power is 20V5A (100W), and IC (E-MARK) is required.
According to the role, the above signals can be divided into five categories:
The first category: Power-related signals, including.
A) VBUS, the buspower of the USB cable (usually consistent with VBUS in your actual sense).
b) VCONN (signal only appears on the plug) is used to distribute power to the plug (it can be inferred that some of the plugs are likely to have a power circuit).
C) GND, grounding device.
Type II: USB2.0 mobile phone charging cable, D+/D-, only one pair at the plug end, consistent with the old USB2.0 specification. However, in order to better apply to the front and back, it can be inserted arbitrarily. The socket end defines 2 groups, so that the socket end can perform proper ping according to the specific situation. Type 3: USB3.1 mobile phone charging cable, TX+/ and RX+/, for fast data transfer. There are 2 sets of plug and socket ends, suitable for any insertion on the front and back.
The fourth category: the signal used for Configuration, the plug has only one CC, and the socket has two CC1 and CC2.
The fifth category: Signals required for the extension effect, the actual application scenario is decided by the corresponding extension effect.
For the different types of sockets and plugs described in 3.1, it is very likely that these 24 pins and signals will not be used for all applications. Please refer to the standard of USB Type-C. In addition, you may notice that in the USBType-C 24 pin signals, Power (GND/VBUS) and data information (D+/D-/TX/RX) are completely corresponding (for Power, anyway Insert, all are the same. Others, including CC, SBU and VCONN, are used for the inspection of bearing, line type, etc.