A brief introduction to the USB connector
According to the USB 3.0 promotion organization, USB 3.1 will have twice the transmission bandwidth of USB 3.0 and will continue to support USB 2.0 devices down. However, when the first device with USB 3.1 will be available, it is still unknown. In addition, the USB 3.0 promotion organization will also hold the first developer conference on the 21st of this month to discuss the USB development plan.
After the introduction of USB 3.0 on November 12, 2008, SuperSpeed brought 5Gbps high-speed transmission performance, and additional 5V/0.9A power supply. With the required transmission rate increase, plus also hope to enhance supply capacity, January 6, 2013 Association of USB IF (USB Implementers Forum) officially announced the launch of a new enhanced version of USB 3.0 (ie USB 3.1). On July 31, 2013, it announced the official development of SuperSpeed 10Gbps. On December 3, 2013, USB 3.0 Promoter Group officially announced the birth of USB 3.1. By Computex Taipei 2014 in June 2014, ASMedia first officially demonstrated the native USB 3.1 chip, achieving SuperSpeed+, which is the SuperSpeed 10Gbps rate.
Currently, usb 3.1 has three connection interfaces, namely Type-A (Standard-A), Type-B (Micro-B), and Type-C.
Type-A (left) and Type-C (right)
Type-A (left) and Type-C (right)
The standard Type-A is currently the most widely used interface, while Micro-B is mainly used in devices such as smartphones and tablets, while the newly defined Type-C is aimed at thinner, thinner devices.
Type-C has greatly reduced the physical appearance, and is more suitable for short and thin handheld devices. Type-C will replace the Micro-AB connector (supporting direct transmission of USB devices without the intervention of the main control system). It will also replace the general Micro-USB connector, Type-C imitation Apple Lightning connector, both positive and negative can be connected normally, more ideal than the existing Micro-USB, although Micro-USB has a foolproof mechanism to prevent reverse connection, but The advantages of both positive and negative can be better than preventing the reverse connection, and the wiring can be successfully completed in the black situation. In addition, Type-C has enhanced electromagnetic interference and RFI mitigation characteristics.
Compared to USB 2.0 5V/0.5A, USB 3.0 provides a 5V/0.9A power supply. But people still want a stronger power supply, so USB 3.1 (SuperSpeed+) will increase the maximum allowable power supply to 20V/5A and power supply 100W.
Power supply specifications - USB Power Delivery (USB PD), is compatible with existing USB 2.0 and USB 3.0 cable and connector design, the new USB 3.1 Type-C connector is also common. The USB PD supports higher voltages and currents to meet different applications and is compatible with existing USB Battery Charging 1.2 charging specifications. The USB PD is a 埠-pair architecture. The USB and power channel communication numbers are separated. The power supply is communicated through the VBus protocol between the host and the device. If the device supports it, the voltage and current according to the profile can be used. Provide a higher supply of wattage. The USB PD is divided into five profiles depending on the device. Both need to use new detectable wires to provide more than 1.5A or 5V. Configuration 1 for mobile phones, 5V/2A (10W), basic power output, more than USB 3.0 5V/0.9A (4.5W); configuration 2 is 5V/2A or 12V/1.5A (maximum 18W) ), can charge the tablet and notebook; configuration 3 is 5V/2A or 12V/3A (can provide a larger notebook power of up to 36W); configuration 4 is up to 20V/3A (60W), but only For Micro-A/B connectors, configuration 5 is for a maximum of 20V/5A (100W) power supply, only for TYPE-A/B connectors. The upgrade of USB 3.1 power supply and the application that supports charging will make USB 3.1 look like a mobile phone, tablet and computer transmission interface.
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