About type-C

I have the honor to touch this knowledge point , Although it is a check to know , But it's not personal , I don't feel very impressed .

What I have learned type-c

My mobile phone is really type-c Of , I think it's very convenient , No matter what direction , Just plug it in and you can connect it to the computer ; For data transmission or charging . There must be usb Two lines , And power . Specifically, why not divide the direction , I haven't done much research ？

type-c The origin of

I always thought , It's just that people have this name , little does one think , This is really made up of A-c Of ; It really has a history , Not so casually named .

The mobile hard disk uses usb3.0,mirco-B

Ordinary 2.0 is type-A

Android mouth , Also use usb2.0 mirco-B, These are used every day in real life , It is also used by some of our own equipment .

Don't underestimate type-c

In no way usb subsidiary .

Type C Previous specifications （TypeA、TypeB、 wait ）, Pay more attention to USB Interface “ hard ” Characteristics of , Such as the number of signals 、 The form of the interface 、 Electrical characteristics 、 wait .TypeC In defining USB Interface “ hard ” Based on the characteristics of , Added some “ soft ” The content of ,USB Interface （ It just means TypeC） Get rid of and USB The subordination of , It becomes a place where you can communicate with USB The new norm of equality .

USB-C（ Also known as USBType C） Norms have their own independent 、 Self evolving specification documents ----USBType-CSpecification（2014 Annual hair 8 sanitary belt 1.0 edition ,2017 year 7 Published in 1.3 edition ）.

type-c Female seat

6pin seat

usb type c 6p The mother block is actually a kind of high current , Special interface for high wattage charging . Support 5A electric current . Pins are defined as follows ：

16pin Female seat , Seats used in own projects

High definition transmission can be realized , Pins are defined as follows ：

Of course , also 24pin, Can be realized type-c All the functions of . Just heard of .

Male seat

Check this by yourself , They are all plywood 24 Foot's .

1. TX+/- and RX+/-, For high speed data transmission . There are two sets of plug and socket ends , Used to support positive and negative random insertion .
2. For the plug , only one CC, For the socket , There are two CC1 and CC2.
3. VCONN（ It's only on the plug ）, Used to supply power to the plug

A1,A2… What are these ？

See the pin assignment above , These questions will arise , Why did not the first 1 The feet are A1 How about these ？ Pins that are defined in character type instead of numbers , This and the following assignment are fixed , It also shows that this is the standard , Whether it's 12 Foot or 24 foot . Just like characters , So the definition is the same .

Why not divide the direction ？

USBType-C24 In a pin signal ,Power class （GND/VBUS） And data classes （D+/D-/TX/RX） It's completely symmetric （ Yes Power Come on , No matter how you plug it in , Is the same ; For data lines , Simple routing , You can work ）. The rest , Include CC、SBU and VCONN, For direction 、 Line type detection .