What is USB interface standard, USB transmission standard and PD function?

1. The figure below shows the USB shapes of various derivative models of USB Type-A and USB Type-B. Note that they are all male shapes.
2. The shape of USB Type-C is very simple, there is only one kind, so it is simple to match the picture. Note that the line part is male.0
3. The following figure shows the various standards of USB transmission. Please note that there is no correspondence between the USB shape and the USB standard.
Nowadays Type-C is on fire, what is the difference with Type-A and Type-B? What is the difference between them and Type-C?

We are all paying attention to the development of mobile phones, but for a long time we have neglected the innovation of many important components around them. Just like the USB cable, there is rarely a technology or transmission standard that is as closely related to our lives as the Universal Serial Bus (Universal Serial Bus), and even to the point where it is not impossible.
No matter how insignificant and worthless you think it is, its role cannot be underestimated. Data transmission and power supply all need to rely on it, and the transmission speed and current load value have been continuously increasing since its development. What we are talking about today is the latest form and concept product of data cables and USB cables-Type-C. After the MacBook, which is also known as the "Xiaobai" iteration, once again lamented Apple's work, many people actually shifted their attention to its data line. That's right, the MacBook is no longer equip with the familiar magnetic power connector, but Type-C.
Why is Type-C so Popular? Are Type-A and Type-B Popular? In fact, there are. After reading this article, you will find that Type-A is actually a very common USB plug, and Type-B is not unfamiliar to some people. But many printers and monitors are still using Type-B for data transmission. The two common plugs in daily life actually have scientific names, and Type-C is just a newcomer. Therefore people are less use the scientific name of Type-A and Type-B which makes you feel strange.
  In fact, after the MacBook, some mobile phone manufacturers that dared to try new things and started to make new models with Type-C interface. Such as LeTV, OnePlus, Nokia, etc. I believe those who have followed the conference will find that Type-C is often related to USB 3.1. This is actually sending a wrong message to the masses. Simply put, USB 3.1 is just an industry standard, and it is also the revision number of the current USB 3.0 standard. This is only a technical standard, not a physical value. So, don’t make the mistake of noting that Type-C interfaces all have USB 3.0 transmission rates, because currently LeTV, OnePlus and other mobile phones that support Type-C plugs are still USB 2.0 standards, only the newly released ZUK Z1 is USB 3.0 transmission standard.

What are the advantages of Type-C?
The most intuitive advantage of Type-C is that it allows you to completely get rid of the trouble of plugging in, and no more damage to components caused by incorrect plugging or mistakes.
  In addition, under the condition of reducing wear and not being restricted by direction, Type-C can take up less space on the circuit board due to technological innovation, which does not actually have much practical change and significance for us outside of the product.  But for hardware product designers, small changes can bring more possibilities and changes to the subsequent internal layout.
Type-C cables and interfaces
In fact, no matter whether it is the USB 2.0 or USB 3.0 standard, there is not much help and change at present. For smart phones, the data cable is mostly used as a tool to charge the device, such as offline movies, online downloads, etc. It helps us to gradually get rid of the era of data cable transmission. For some environments and needs, it is undeniable that the transmission speed of USB 3.0 will indeed make you more enjoyable. It is all these years, and there is no need for the speed difference between 2.0 and 3.0. Popularize it, "time" can prove everything.
What are the disadvantages of Type-C?
Speaking of disadvantages, the most important thing at this stage is that there are fewer devices with Type-C interfaces. But this is a process. In the process of a new thing beginning to popularize, what we have to go through is to adapt to it, and in the process of adapting, we continue to wait for its team to continue to grow, so as to be truly Popularity.
Just like the transition from iPhone4S to iPhone5 at that time, at that time we were not full of offices to find friends with iPhone5 mobile phones and Lightning data cables. The same is true for Type-C. Friends who have Type-C interface devices around must have had trouble finding Type-C data cables and unable to charge them.
Moreover, Nowadays there are lots of supplier to make usb c dock, various usb c hub to support not only usb c hdmi adapter, usb c to usb 3.0 and usb 3.1, gen1 adapter, but as well as usb 3.0 ethernet adapter. Overall, Usb type c is a Advance in charging technology and data transport which allow us to live and work more efficiently。
So for readers who want to get started or who already have Type-C interface devices, after you enjoy the worry-free plugging and unplugging, you also need to consider whether a data cable is really enough. If you are out, there is no data cable. , That basically the equipment belongs to the edge state of absolute "death". Moreover, after you have a Type-C interface device, a large number of spare USB data cables that you have previously accumulated will be meaningless, which is also a necessary way in the innovation process.
Type-C interface of Nokia Z1
In short, Type-C can be said to be a new standard for USB data interfaces in the next few years. It is believed that the popularity in the future will be more perfect than it is now, and the speed must be rapid. Judging from the current trend, there will be more and more devices supporting Type-C interfaces in the future, and more and more devices supporting Type-C interfaces will surely emerge at the end of 2015 and early 2016.

What is the relationship between USB Type-C, PD and USB 3.1?

Although the industry has talked about USB Type-C, PD, and USB3.1 for so long, few articles can really explain what these three are, what are the differences, and what are the connections.
  The following is your answer about difference between USB Type-C, Power Deliver, USB 3.1 Gen1/Gen2.
   1. What is the difference between USB Power Delivery and USB Type-C?
  USB-Power Delivery (USB PD) is a protocol specification that supports up to 100W power transmission and data communication in one cable. USB Type-C is a brand-new specification for positive and negative USB connectors that can support a series of new standards such as USB 3.1 (Gen1 and Gen2), Display Port and USB PD. The USB Type-C port can support up to 5V3A by default. If USB PD is implemented in the USB Type-C port, it can support the 100W power (5V20A) defined in the USB PD specification. Therefore, having a USB Type-C port does not mean that it supports USB PD.
 2. Is USB Type-C mandatory for USB3.1 Gen1 or Gen2 specifications? Is USB Type-C equivalent to USB3.0/3.1?
no. The USB Type-C specification is independent of the USB3.1 Gen1 and Gen2 specifications. We can use the traditional TypeA and TypeB interfaces to support Gen1 or Gen2. The USB Type-C specification is a brand new specification made by USB-IF, which supports up to 100W power transmission and positive and negative insertion. The USB Type-C connector can be designed as Gen1 or Gen2.

  3. What is the difference between USB-PD 2.0 and Qualcomm’s QC?
USB-PD 2.0 is a protocol developed by USB-IF, which can provide a power supply mechanism with a power of up to 100W (20 V, 5 A) between USB devices. It can also support both USB and non-USB data in the USB Type-C port. signal. It allows Host and peripherals to dynamically negotiate the direction of power supply.

  Qualcomm® Quick Charge™ is a proprietary charging protocol developed by Qualcomm. A customized charger that supports the Qualcomm Quick Charge protocol is used to charge devices that also support the protocol. Quick Charge 2.0 provides a maximum of 60W power, but unlike USB-PD, it cannot support power supply and data transmission at the same time, nor does it support dynamic selection of the power supply direction during charging. Please refer to the USB-PD 2.0 specification for details.

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