GENERAL DESCRIPTION
W81181D, an high integrated 4 port USB hub controller which integrates a microcontroller, implements a medium speed (12 MHz) and slow speed (1.5 MHz) Universal Serial Bus (USB) hub control interface. It supports one upstream, four downstream ports and a serial interface. W81181D can be act as multifunction USB device. For example, the whole system can be designed as an USB HUB plus an USB mouse or an USB HUB plus an IR receiver, and no down stream port be occupied as well as no other component needed.

FEATURES
• Full compliance with USB spec Rev 1.1 and HID Class Definition Rev 1.0
• Compliance with USB Hub spec Rev 1.1
• Support multiple endpoints for standalone hub with attached function
• Embedded microprocessor--8052 ( 6K ROM + 256 Byte RAM)
• Support auto-detected two power source mode between bus power mode and self power mode.
• 12-MHz crystal/oscillator input to lower EMI (W81181D)
• 48-Mhz oscillator input for motherboard application (W81181AD)
• Support Suspend and Resume operation
• Four downstream ports with per port overcurrent protection
• Two endpoints for hub (Control and Interrupt)
• LED display supports bright/blinking alternative for port enable and OCP(over current protection) flags
• Single 5V supplied with embedded 5V-3.3V regulator
• Three endpoints for attached device (one Control and two Interrupt)
• Provides the external pull-up resistor control for the up-stream connection.
• Perport/Global downstream port power control optional
• Packaged in 48-pin LQFP
• 5V CMOS device