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About the USB Type - c here that you want to know

Writer:www.turnmax-tech.comSource:东莞市腾茂电子有限公司 Date:2016-11-14

First, let let's cutting directly from the USB TYPE - C Spec a USB TYPE - C female pin feet figure to look at:


USB TYPE - C female pin drawing

As you can see, mother seat has 24 root signals, including power supply and land occupied eight root, used to improve current transmission capacity, the remaining 16, used for the transmission of USB2.0 two groups of signal is cross connected, remove duplicate two, there are 14 signal. Include the familiar 2 group, a total of eight root can be used for data transmission usb3 RXx and TXx, D + usb data signal, D - and SBU1 SBU2, CC1, CC2. The SBU1 SBU2, CC1, CC2 is one of the traditional USB interface no signal. CC are the soul of the USB TYPE - C interface, load bearing TYPE - C connection transmission direction in the process of confirmation and positive and negative functions, as well as USB PD BCM code signal transmission function, can realize the function of load configuration. Two wires CC line, when one CC as TYPE - C interface configuration signal, a second CC as EMARKER chip power supply cable. The rest of the SBU1 and SBU2 as auxiliary signal, has different purposes in different application scenarios. For example, in the ALT MODE to DP signal transmission MODE, as the audio transmission channel, in the TYPE - C analog audio headset accessories model, as the microphone signal transmission channel.
So, mentioned the most positive and negative thrust, the realization of what? The secret is CC male head. Let's take a look at the CC male head structure.
The USB TYPE - C plug
Contrast mother wiring diagram, we can see that the male head only a CC, another CC into VCONN, so, when the male head inserted into the female, male head CC to female seat CC1 together, may also be connected to mother a CC2, corresponding to insert is inserted and the two cases. Mother seat need to use a single chip to detect is CC1 connection is established, or CC2 connection is established, to control the SWITCH of the equipment, to the right fit data transmission, or audio and video transmission signal.
To figure out the transport interface structure and the positive and negative after recognition principle, let's take a look at the details of current transmission, according to the standard issued by the USB - IF, each version of the USB interface, current transmission capacity is as follows:
USB current transmission capacity
Can be seen from the table above the USB Type - C is not necessarily support 20 v / 5 a, by default, only support 5 v3a, must be in the USB PD communication ability, and have Emarker chip on a transmission line, can only support to 20 v / 5 a. Relative to the standards, of course, the difficulty of the work itself, the design of USB PD and EMARKER chip is actually a piece of cake. Under normal circumstances, the standard after the release of half a year will have samples, can batch production in a year. Such as there has been a domestic support CC logic LDR6013 chip, and support the USB PD LDR6021 LDR6023 chip.
Power transmission, already know, let's look at that specific data transmission. In traditional TYPE - A start in the interface, there is A group of A group rx and tx, A total of four high speed signal transmission lines, top 5 g bandwidth transmission signal. While TYPE - C interface, a total of two groups of rx and tx, the two groups, a total of eight root high speed signal transmission line, it is of positive and negative considering, for the start signal transmission, using only one group at a time. In addition, also can be used to separate, the use of PD, into the ALT mode, among them 4 root for transmission USB3. X signal, another 4 root and sbu1 and sbu2 together, 2 lane DP signals for transmission. Also can consultation into 8 differential thread, and sbu1, sbu2 combination, all used in DP signal transmission. So is 4 lane DP signal, the highest resolution can be up to 8 k. The flexible application of type - to c interface is endowed with limitless possibilities. After all, is the ability of power supply, data, audio and video transmission, and the transmission performance of a transmission line is more excellent than the old ones. Is really walk others road, let others no way to go. TYPE - so the cow B, C, of course, but don't forget, cable transmission there was another player, that is optical fiber. The limits of the transmission bandwidth, which is calculated according to the T (1000 g). Moreover, the existing TYPE - C and sustainable fiber MODEN power transmission capacity. So, if on the basis of existing TYPE - C cable, replace eight high-speed signal transmission line with a single fiber, who knows what will happen?
Summarized above, USB Type - C put an end to the long USB need through trial and error to repeated history, many saves people a lot of time, change a direction at least 2 s, according to the global 1 billion people a day a USB plug, 50% probability of fault, took more than 277000 hours, about 31 years, too scary. An interface with the power, data, three kinds of audio and video data transmission requirements, and small volume. Predictably, after the mobile phone can be changed to a USB Type - C interface, if only need USB, you just need to redo cable, need to add some function interface chip, completely negligible cost. While on the phone to see, the real revolution is about to appear. PC may no longer be needed, a mobile phone, through the TYPE - C output DP, access can complete the function of the computer monitor. If VR is connected, then the whole world is not the same. Excuse me, who else will need a PC, laptop, this kind of heritage in the 20th century?

TypeInfo: Corporate News

Keywords for the information:Type-C