This device is a self-contained USB Hub which complies with USB Hub spec Rev 1.0. This device is used to expand the USB ports of your PC system while needed. Because of its self-contained and bus-powered/self-powered capabil-ity, it can hide the complexity from the user and be flexibly placed anywhere, such as monitor, keyboard, motherboard, hub-box, etc. The MC141556 con-sists of Serial Interface Engine(SIE), Hub Repeater, and Hub Controller, sup-porting one upstream port and up to five downstream ports. It also provides optional IIC(M_BUS) programmable Vendor ID and Product ID.
Both Low speed mode (1.5 Mbps) and Full speed mode (12 Mbps) are sup-ported by automatically detecting which data line (D+ or D-) is pulled high whenever downstream devices are connected to the bus or at power-up.
MC141556 can be self-powered or bus-powered. When self-powered, MC141556 is powered by external 5 volt supply and capable of delivering 500mA current to each downstream port. Power management for all down-stream ports supports power-switching and overcurrent detection with Individ-ual or Ganged control; a self-powered MC141556 supports Individual control only, but bus-powered MC141556 supports either Individual or Ganged control. When Ganged control, PWRSW1 and OVR1 are dedicated for power manage-ment.
IIC(M_BUS) interface is provided to set up customized Vendor ID, Product ID, Power Mode, Power Management Mode, Number of Downstream Ports and Overcurrent Debounce Setting.