What is a USB 3.1 Type C?

What is a USB 3.1 Type C?

USB-C basically describes the plug’s shape. For example, if you use an Android phone the connector shape of the previous standard is USB-B and the flat one on your computer is called USB-A. The connector itself can support various exciting new USB standard like USB 3.1 and USB power delivery.

As technology moved from USB 1 to USB 2 and on to modern USB 3, the standard USB-A connector has stayed the same, providing backward compatibility without the need for adapters. USB Type-C is a new connector standard that’s about a third the size of an old USB Type-A plug.

This is a single connector standard that can connect an external hard drive to your computer or charging your laptop, like the Apple Macbook. This one tiny connector can be small and fit into a mobile device like a cell phone, or be the powerful port you use to connect all the peripherals to your laptop. All this, and it is it reversible to boot; so no more fumbling around with the connector the wrong way.

espite their similar shapes, Apple’s Lightning port is completely proprietary and won’t work with superior USB-C connector. Lightning ports had limited acceptance beyond Apple products and thanks to USB-C, are soon be as obscure as firewire.

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USB 3.1 Type C Specification

Small size, support for forward and reverse insertion, fast (10Gb). This small is for the USB interface on the previous computer, the actual relative
The microUSB on the android machine is still a bit bigger:
Features
USB Type-C: 8.3mmx2.5mm
microUSB: 7.4mmx2.35mm
And lightning: 7.5mmx2.5mm
Therefore, I can't see the advantages of USB Type-C on handheld devices in terms of size. And the speed can only see if the video transmission is needed.
Pin definition

What is a USB 3.1 Type C?

It can be seen that the data transmission mainly has two sets of differential signals of TX/RX, and CC1 and CC2 are two key pins, which have many functions:
• Detect connections, distinguish between front and back, distinguish between DFP and UFP, that is, master and slave
• Configure Vbus with USB Type-C and USB Power Delivery modes
• Configure Vconn. When there is a chip in the cable, a cc transmits a signal, and a cc becomes a power supply Vconn.
• Configure other modes, such as when connecting audio accessories, dp, pcie
There are 4 power and ground, which is why you can support up to 100W.

 

What is a USB 3.1 Type C?

 

Don't watch USB Type-C seem to support up to 20V/5A, in fact this requires USB PD, and support for USB PD requires extra
Pd chip, so don't think that it is a USB Type-C interface that can support 20V/5A.
Of course, there should be chips that are integrated together in the future.
The auxiliary signals sub1 and sub2 (Side band use) are used in certain transmission modes.
d+ and d- are standard before USB compatibility.
Here to talk about, USB3.0 only has a set of RX/TX, the speed is 5Gb, USB Type-C can be inserted into two groups in order to ensure the positive and negative,
But in fact, data transmission still only uses a set of RX/TX, the speed has reached 10Gb. If the agreement is later upgraded, both groups will pass it.
It is 20Gb like DisplayPort.

 

Work Process

 

What is a USB 3.1 Type C?

 

The DFP (Downstream Facing Port) is the main picture, and the UFP (Upstream Facing Port) is the slave. In addition to DFP, UFP,
There is also a DRP (Dual Role port), DRP can be used as DFP or UFP. When DPR is connected to UFP, DRP is converted to DFP. When DRP is connected to DFP, DRP is converted to UFP. The two DRPs are connected together, at which point either one is DFP and the other is UFP.
The CC pin of the DFP has a pull-up resistor Rp, and the UFP has a pull-down resistor Rd. When not connected, DFP's VBUS is outputless.
After the connection, the CC pin is connected, and the CC pin of the DFP detects the pull-down resistor Rd of the UFP, indicating that the connection is on, and the DFP is turned on.
Vbus power switch, output power to UFP. And which CC pin (CC1, CC2) detects the pull-down resistor to determine the interface inserted
Direction, by the way, switch RX/TX.
The resistance Rd=5.1k, the resistance Rp is an indeterminate value. According to the previous figure, there are several power supply modes for the USB Type-C. What is the difference? By the value of Rp, the value of Rp is different, the voltage detected by the CC pin is different, and then the power supply mode of the DFP terminal is controlled.
It should be noted that the above picture shows two CCs. In fact, there is only one cc line in the cable without the chip.
The cable containing the chip is not two cc lines, but a cc, a Vconn, used to power the chip in the cable (3.3V or 5V).
At this time, there is no pull-down resistor Rd on the cc terminal, but a pull-down resistor Ra, 800-1200 ohms.

 

What is a USB 3.1 Type C?

What is a USB 3.1 Type C?

 

When the CC pin is connected to the pull-down resistor <=Ra, the DFP enters the audio accessory mode, the left and right channels, and the mic are all as shown above.
USB Type-C and DisplayPort, PCIE
USB PD is a BMC-encoded signal, and the previous USB is FSK, so there is incompatibility, I don’t know if there is any on the market.
Products that can be converted.
The USB PD is transmitted on the CC pin, and the PD has a VDM (Vendor defined message) function, which defines the device ID.
When reading a device that supports DP or PCIe, DFP enters alternate mode.
If DFP recognizes that the device is DP, switch the MUX/Configuration Switch and change the Type-C USB3.1 signal pin to
Transmit DP signals. AUX assistance is transmitted by SBU1, SUB2 of Type-C. HPD is a detection foot, similar to CC, so it is shared.
The DP has four sets of differential signals for lane0-3, and Type-C has four sets of differential signals for RX/TX1-2, so there is no problem with complete replacement.
Moreover, in the alternative mode in the DP protocol, the USB signal and the DP signal can be simultaneously transmitted, and the RX/TX1 transmits the USB data.
RX/TX2 is replaced by lane0, 1 two sets of data transmission, which can support 4k at this time.
If DFP recognizes that the device is DP, switch the MUX/Configuration Switch and change the Type-C USB3.1 signal pin to
Transmit PCIe signals. Similarly, PCIe uses RX/TX2 and SBU1, SUB2 to transmit data, and RX/TX1 transmits USB data.
The advantage of this is that one interface uses two devices at the same time. Of course, the conversion line can be done without any chips.

 

The Last

USB Type-C terminates the shortcomings of USB plug-ins for a long time, saving people a lot of time, changing the direction at least 2s,
According to the global 1 billion people plugging and unplugging USB once a day, 50% probability of insertion error, a total of more than 277,000 hours, about 31 years, too horrible.
One interface has three kinds of audio and video data, and the volume is still small. It can be foreseen that the Android machine can be changed to the USB Type-C interface in the future.
If you only need USB2.0, you only need to redo the cable, no chip, the cost is completely negligible.
As for Thunderbolt, lightning, what should I do? A hundred flowers are the world of multicolored.

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Post time: Nov-15-2018
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