Four-way USB2.0 hub

I watched the USB hub made by b standing eda’s 2020 summer camp teaching video.

Although it looks simple, the troubleshooting in the process is very difficult.

Experience: The board I made at the beginning was square, with USB-A ports at the four corners, but the schematic diagram was wrong. I reversed the GND and VCC of the USB-A port, and the board was short-circuited. I thought it was a problem with the type-c port or the chip welding.

The two devices are really difficult to solder, and it is easy to connect the tin accidentally. I have soldering experience in the previous project, but one of them was still damaged. Two of the FE1.1S were soldered, and the pin of the third chip was a bit messy. Small distortion. Later, I suspected that it was a fuse problem. I bought a 0805 fuse with a normal operating current of 1.1A and a trip current of 2.2A. I felt that the current was not enough, so I removed the fuse connected to the C port and directly tinned it as a wire. Later, I tried to connect a USB flash drive and As a result of charging the mouse, two things were burned, and the USB of my laptop was almost burned. The USB port was not working for a few minutes, but fortunately it was restored later. Then I suspected that it was a problem with the crystal oscillator. When the crystal oscillator did not use arithmetic wiring, and when I drew the second board, I accidentally discovered that the GND and VCC of port A were reversed, and I was devastated. Finally got it out.

Lesson: The power supply of the computer USB port is generally 5V/500mA, and it is best to connect a fuse to the wiring.