Preliminary W81181D/AD

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1. 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.

W81181D acts as an USB hub controller and a hub repeater at the direction of an internal

microcontroller. W81181D controls the traffic among the host, four downstream ports, and the

microprocessor. As a hub controller, it can enable/disable ports, send and receive resets, and detect

devices of high or low speeds. The W81181D contains three function endpoints and two hub

endpoints to allow both USB Control and Interrupt Transfers between the host and microcontroller.

W81181D is a compound USB device (hub with embedded function attached) with totally five

downstream ports. W81181D can be used as a hub controller in a standalone hub with attached

function or a microcontroller based USB device with hub function.

Ordering Information

PART NO.

INPUT CLOCK Freq.

PACKAGE

W81181D

12 MHz

48-LQFP

W81181AD

48 MHz

48-LQFP

2. 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