Based on SL2.1A USB one to four hub (verified)

USB2.0 hub based on SL2.1A

Friends who play electronics know that the USB ports of computers are simply not enough, especially those with thin and light laptops. There are only 2-3 USB ports. After plugging in a keyboard, mouse and other devices, there are no usable USB ports. Frequent plugging and unplugging can easily cause the USB port to become damaged. It's loose, sometimes the cable isn't long enough and it's annoying, and the USB port is easily damaged (don't ask me how I know, because I've already lost a 3.0 USB port). I bought a USB2.0 hub before, but the USB port is easily damaged. Two USB devices are unstable. In order to solve this problem, a one-to-four USB2.0 hub was built based on the SL2.1A chip. (I’m so miserable that I’m still changing my board in the dormitory at 520)

SL2.1A Overview

SL2.1A is a highly integrated, high-performance, low-power USB2.0 hub main control chip; the chip adopts STT technology, single power supply mode, the chip power supply voltage is 5v, and the internal integrated 5V to 3.3V converter only A filter capacitor needs to be added to the external power supply; the chip has its own reset circuit, and its low-power technology makes it even more outstanding. The chip can use either an external crystal or a built-in crystal. If using the built-in crystal, the XI input of the chip needs to be grounded. Perfectly supports USB2.0 high speed (480MHz), USB2.0 full speed (12MHz), and low speed mode (1.5MHz). Integrated 12M crystal oscillator integrates 12MHz-to-480MHz PPL (Phase Lock Loop) and uses Single Transaction Translator (STT) technology. , is the most cost-effective and efficient solution in the *TT series that supports automatic enumeration switching from self-powered to bus powered.
Charging supports
SL2.1A and supports the standard BC1.2 charging protocol.

• Since most of them use type-c and Micro (referred to as Android data cable) data lines, type-c and Micro female sockets are added. At the same time, the SMD crystal oscillator package: SMD3225 and the in-line crystal oscillator package: HC-49S are reserved. Just install whatever crystal oscillator you have! In order to reduce the difficulty of welding, the capacitor packages are all in 0805 package.

Note: Copper pillar size: M2*10MM (double-pass circular knurled copper pillar); M2*3MM (single-head single-pass knurled copper pillar)

Screw: M2*3MM

Final product picture

Data test chart:

Using SanDisk (SanDisk 2.0 U disk test)

Use Lichuang Mall model: LC-M-23 32GB  No.: C601502 U disk test

Use Lichuang Mall model:  U320-64G    No.: C702949 U disk test

Parts list