General Description
HT82M28A is a Plug and Play 3D USB Mouse controller. The HT82M28A can support the USB Standard Request as well as HID Class Request version 1.1. The Z-axis can support only Z/2 encoder scroller input. It requires minimal external components to implement 3D and Win dows Vista 7 key USB mouse. All its features combined and make up this versatile Holtek 8-bit MCU with an on-chip USB interface logic. The USB is specified by the Universal Serial Bus Specification V2.0.
The USB product ID of 5 key mode is 2083H, and the USB product ID of 3 key mode is 2082H.

FEATUREs
• Operating voltage: 4.4V~5.25V
• Compatible with Microsoft Windows 2000 and 5-button Wheel Mouse
• Supports 5/7 buttons and Z-axis input
• Z-axis can support only encoder Z/2 scroller input
• Complete Universal Serial Bus specs V2.0 compatibility
• Vista tilt mouse protocol supported
• 3 key or 5 key mode can be selected by circuit
• DPI can be selected high or low by circuit
• Tilt or Non-tilt protocol can be selected by circuit
• Serial Bus Interface Engine (SIE)
• USB transceiver
• Single chip solution especially for USB mouse function
• HALT function and wake-up feature reduce power consumption
• Plug and Play functions
• Minimal external components
• 6MHz crystal oscillator for system clock
• Interface compliant with A2610, A2620, A5020, and P3101
• Pass USB-IF and EMC testing
• 20-pin DIP/SOP package