USB2.0-SL2.1A expander

USB 2.0 interface 4-port HUB chip: SL2.1A is a highly integrated, high-performance, low-power USB2.0 hub main control chip; the chip uses STT technology, single power supply mode, and the chip power supply voltage is 5v. It integrates 5V to 3.3V internally, and only needs to add a filter capacitor 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 connected to ground. Perfectly supports USB2.0 high speed (480MHz), USB2.0 full speed (12MHz), and low speed mode (1.5MHz). Integrated 12M crystal oscillator, integrated 12MHz-to-480MHz PPL (Phase Lock Loop), and Single Transaction Translator (STT) technology. , is the most cost-effective and efficient solution in the *TT series. Supports automatic enumeration switching from self-powered to bus powered. Supports the use of external EEPROM to customize VIDPID information. SL2.1A is packaged in SOP16. The market mass supply price is 0.XX, which is relatively cheap The 1.xx HUB chip is undoubtedly very cheap.
 
In a word: It has been verified. Just use it as a doctrine and use it for free.