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USB interface with serial port based on FE2.1

Overview

USB_HUB with serial port download based on FE2.1

1. Project background

My laptop is thin and light, with two USB ports. The wireless mouse and keyboard usually occupy one port, leaving only one USB port. For an electronic gamer who plays with microcontrollers and has many USB peripherals, this is a bit intolerable. I went online and bought a one-to-three USB 2.0 adapter with free shipping for 9.9 cents, and it looks pretty good. A slightly prettier one is the USB3.0 HUB, but I think the price/performance ratio is low, so I want to make one myself.

2. Circuit board 3D model diagram

front:

back:

3. Introduction to the main internal chips

FE 2.1

This chip is a USB 2.0 low-power, low-cost solution USB hub chip that can turn 7. It is packaged in LQFP48 and only uses 5 USB and 4 USB-A. female socket and a port that acts as a USB-to-serial port.

CH340C

Compared with the CH340G, the USB to serial port chip, CH340C, can save an external crystal oscillator and reduce the board area. Of course, the smaller CH340E can also be used.

AT24C32

External eeprom for FE 2.1

4. Physical pictures

Design Files

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Update:2025-05-05 16:16:58

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