GENERAL DESCRIPTION
The W81282F is a highly integrated USB keyboard with 4 port hub controller chip. The W81282F has a built-in 21X8 default keyboard matrix, so that it can be directly connected to keyboard with multi-media function matrix. The keyboard matrix, vendor ID, and device ID can be easily customized from an optional EEPROM or modify firmware to meet any customers requirement. The 4 USB down-stream port can be used to connect various USB peripheral devices, such as printer, modem, speaker, camera, mice, and joystick, to system without any external glue logics. The W81282F use 12MHz clock input with internal PLL to eliminate EMI effect. The W81282F also built-in ESD/EFT protection circuit so it can pass ESD/EFT test without any external glue logics.

FEATURES
• Full compliance with USB spec Rev 1.1 and HID Class Definition Rev 1.0
• 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
• Support Suspend and Resume operation
• Support ACPI features
• Four downstream ports with per port over-current protection
• Single 5V supplied with embedded 5V-3.3V regulator
• Provides the external pull-up resistor control for the up-stream connection.
• Per-port/Global power control optional
• Built-in ESD/EFT protection circuit
• Support 21 X 8 keyboard matrix
• Support consumer control function for multi-media
• Support optional EEPROM for vendor ID, device ID, and KB matrix down load
• Support encoder input for audio volume control
• Provide the external pull-up resistor control for the up-stream connect
• 100-pin PQFP
• 5V CMOS device