Functional features:
Fully compatible with USB2.0 standard;
Supports 4 downstream USB2.0 ports;
Upstream port supports high-speed (HS)/full-speed (FS) transmission;
Downstream port supports high-speed (HS)/full-speed (FS)/low-speed (LS) transmission;
Backward compatible with USB1.1 standard;
Built-in optimized RISC-like processor;
Supports reading user-defined PID, VID, manufacturer name, product model, version serial number from external EEPROM;
Supports single TT, and 4 downstream ports share this TT;
Each downstream port has two working indicators (supported by QFP48 package);
The upstream port has a built-in 1.5K pull-up resistor, and the downstream port has a built-in 15K resistor;
The optimized USB transceiver can improve the signal transmission quality;
Supports Gang/Individual two overcurrent protection modes;
Supports bus power supply and self-power supply options;
Supports composite USB devices;
Built-in PLL, external 12MHz crystal;
Built-in 3.3V/1.8V LDO for internal power supply;