Love Tomb Style No. 2 - USB Docking Station in the VL822 Atmosphere

Input: USB-B 9Pin interface

Output: 4xUSB3.2GEN2 interface

The devices in our hands can only run so fast. Wait for someone who is destined to run 1G/s.

Regarding the breathing light: This is a feature of the chip. This solution can be run without using external FLASH firmware.

And for USB3 devices, the breathing light frequency is higher, and USB2 has a lower breathing frequency.

One potential problem is that VL822 requires 2 DC-DC (1.05V+3.3V) power supplies, and the 1.05V power supply will generate a lot of heat (when a USB3 device is plugged in)

Personally, I think it is a bit strange that there is more than 1A current on the 1V path, but the same is true after replacing the chip, so I speculate that in some scenarios, the instantaneous current on the 1V path may exceed 1A.

If you want to prototype this project, it is recommended to replace the DC-DC on your 1V path. If you only connect USB2 devices, the 1V DCDC will not cause abnormalities.

(Added on 2022-8-25: When testing an M.2 hard drive box, the heat described above is not obvious, but it is a little warm)

2022-8-25 New speed test pictures added: I found my parents’ hard drive box for testing, but I’m not sure about the parameters on the hard drive box. I guess it’s USB3.1 GEN1, and it only ran a score of less than 400M. The original The same goes for direct cable connections to computers;

All four USB ports can be used normally, but the result is as follows, and the result is almost the same as the speed of direct connection to the computer, so only this picture is released.

In addition, the purpose of installing a capacitor on the DC-DC EN is to adjust the power-on sequence of 3.3V and 1.05V. I have an impression in my mind but cannot find the exact information. The general idea is to pull up 3.3V first, and then pull up 1.05V. V, so I actually did not solder the EN capacitor of the 3.3V DC-DC. Instead, I soldered the 150nf EN capacitor on the 1.05V DC-DC side.