High-speed USB3.0 sharing device with four inputs and four outputs selection HUB+ switch

##### B station video: [https://www.bilibili.com/video/BV11D4y1s7so](https://www.bilibili.com/video/BV11D4y1s7so)
# 1. Introduction
function: multiple USB3.0 Or when USB2.0 devices need to frequently switch between different devices, this project can be used to quickly switch USB mounting devices between different devices.
Similar products: USB sharer, this product is a USB device shared by four computers
! [image.png]
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For example: four different computers A, B, C, and D use USB-A to TYPE-C to connect to this switch , the USB device mounts the mouse, keyboard, and large-capacity USB storage device. When the switch is switched to computer A, the mouse, keyboard, and large-capacity USB storage device mounted on the USB device will be connected to computer A, and other computers will not be connected. When you need to switch computers, you do not need to unplug the mouse, keyboard, or large-capacity USB storage device mounted in the USB device. You only need to safely eject the large-capacity USB storage device in computer A and press the switch button. Press the button to switch to computer B, and the mouse, keyboard, and large-capacity USB storage devices mounted in the USB devices will all be reconnected to computer B, and computer A will be disconnected, eliminating the trouble of unplugging and plugging in USB-mounted devices.

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Application: A set of mouse and keyboard peripherals, camera, microphone, high-speed USB, mobile hard disk, etc. using multiple computer devices, such as: desktop + notebook + Raspberry Pi development board + game console, etc.

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Principle :
The TYPE-C USB 3.0 interface is used to communicate with the host. It converts TYPE-C USB 3.0 into an ordinary 2-speed differential USB3.0 signal through VL160, and adds the 2.0 signal on TYPE-C to form an ordinary USB3.0 signal. .
Use the CH484M high-speed switch to switch the USB3.0 high-speed signals converted from 4-channel TYPE-C USB 3.0 to the VL822 USB3.0 HUB chip
VL822 to extend the 4-channel USB3.0 signals to external devices

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I have also done USB2 before. The .0 version of the switcher is more suitable for low-speed devices such as keyboards and mice.
Link:
[https://oshwhub.com/Aknice/e3a68120fa8d49ff8bc50ad21d57ec9d](https://oshwhub.com/Aknice/e3a68120fa8d49ff8bc50ad21d57ec9d)

![1.jpg] ![2.jpg] ![IMG_2769.JPG] # 2. Box Figure
![image.png] # 3. The measured
TYPE-C cable needs to use USB3.0 TYPE-C. Ordinary TYPE-C cable can only run at a speed of 2.0
! [-4871da9e5140249b.jpg] There is currently no better one on hand. High-speed equipment, so it can only be so fast
# 4.
Screwless snap-on design of the casing
! [image.png] # 5. To summarize,
the chips are purely hardware controlled, and the chips are all QFN, which will test the welding level.
Modification suggestions: USB high-speed signals are recommended to be differential. And for 90 ohm impedance matching
, the board thickness should be 1.0. It is actually adjusted according to the thickness of the plywood TYPE-C. Generally, the plywood is 1.0 or 0.8**