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;