GENERAL DESCRIPTION
It is compatible with Microsoft Intelli mouse. Pin Assignment Z1 Z2 RESET MODE OSCI OSCO CLOCK DATA VSS 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 VDD TEST Y2 Y1 X2 X1 LB Ro RB HT82M33A – 18 DIP 1 3rd Mar ’99 HT82M33A Pin DESCRIPTION
Pin No. 1,2 3 Pin Name Z1, Z2 RESET I/O I I DESCRIPTION
“Z axis input”: Supports two kinds of scroller input, optomechanical and mechanical “Reset input”: Resets internal circuit by input low, normal is connected to high by internal pull-high resistor (120kΩ). “MS or PS/2 mode selection”: Low for PS/2 mouse, high for MS mouse. The MS PnP mouse ID code sure will appear when this pin rise from low to high. Normal is connected to low by internal pull-low resistor (60kΩ). The mode input transition voltage is 2.0V. “Oscillator in”: Connect to 2MHz crystal or resonator “Oscillator out”: Connect to 2MHz crystal or resonator “CLOCK I/O”: PS/2 mouse CLOCK line. NMOS open drain output with 7.5kΩ pull-high resistor. “DATA/RXD I/O” PS/2 mouse DATA line or MS mouse RXD output.
Holtek Semiconductor
