Pin Description

Pin No.

Pin Name

I/O

Description

1,2

Z1, Z2

I

“Z axis input”: Supports two kinds of scroller input, optomechanical

and mechanical

3

RESET

I

“Reset input”: Resets internal circuit by input low, normal is

connected to high by internal pull-high resistor (120k

4

MODE

I

“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 (60k

5

OSCI

I

“Oscillator in”: Connect to 2MHz crystal or resonator

6

OSCO

O

“Oscillator out”: Connect to 2MHz crystal or resonator

7

CLOCK

I/O

“CLOCK I/O”: PS/2 mouse CLOCK line. NMOS open drain output

with 7.5k

8

DATA

I/O

“DATA/RXD I/O” PS/2 mouse DATA line or MS mouse RXD output.

NMOS open drain output with 7.5k

9

VSS

I

Negative power pin

10~12

RB, Ro, LB

I

“Right Button”: Normal pull-high (45k

“Rolling Button” : Normal pull-high (45k

“Left Button”: Normal pull-high (45k

13~16

X1, X2,

Y1, Y2

I

“X/Y axis input”: Auto level detecting input. Any signal over 0.6V

17

TEST

I

“IC test pin”: with built-in pull-low resistor. In normal operation

this is connected to VSS or floating. While the pin is connected to

VDD, this will provide the H/W test. The chip will accord the state

of the RB pin, to switch the X1/Y1 and X2/Y2 via the PIN Ro and

LB output.

18

VDD

I

Positive power pin.

Absolute Maximum Ratings

Supply Voltage .............................. –0.3V to 6.5V

Storage Temperature................. –50

Operating Temperature............... –25

Note: These are stress ratings only. Stresses exceeding the range specified under “Absolute Maxi-

mum Ratings” may cause substantial damage to the device. Functional operation of this device

at other conditions beyond those listed in the specification is not implied and prolonged

exposure to extreme conditions may affect device reliability.

HT82M33A

2

3rd Mar ’99