HT6523

PS/2 Mouse Controller

Pin Assignment

Pin Description

Pin No.

Pin Name

I/O

Description

1, 5

NC

¾

No connection

2

TEST

I

If TEST is floating or connected to VSS, then the chip is under normal opera-

tion. If TEST is connected to VDD, it will operate under the TEST mode.

3

RESET

I

Input to reset internal LSI

4

OSC

I

OSC is connected to an external resistor then to VDD to generate a 6MHz sys-

tem clock.

6

CLK

I/O

Synchronous clock signal. The mouse generates a clock signal when sending

data to and receiving data from the system.

7

DATA

I/O

Bidirectional data transmission line

8

VSS

¾

Negative power supply, ground

9

10

11

RB

MB

LB

I

In the non-active state these 3 switch inputs are pulled low. To activate they

must be connected to VDD.

In the TEST mode, MB, LB will indicate the condition of the X1, X2 inputs, if RB

is left floating or connected to VSS. Also in the TEST mode, if RB is connected

to VDD then MB and LB will indicate the condition of the Y1 and Y2 inputs.

12

13

14

15

X1

X2

Y1

Y2

I

Mouse interface input terminal. Four photo-coupler signals denote UP, DOWN,

LEFT and RIGHT state.

16

VDD

¾

Positive power supply

Rev. 1.20

1

March 6, 2003

General Description

The HT6523 is a PS/2 compatible mouse controller IC.

Capable of driving up to 3 key-switches and 4

photo-couplers directly into a 6-pin connector line.

Features

1 6

1 5

1 4

1 3

1 2

1 1

1 0

9

1

2

3

4

5

6

7

8

H T 6 5 2 3

1 6 D I P - A

N C

T E S T

R E S E T

O S C

N C

C L K

D A T A

V S S

V D D

Y 2

Y 1

X 2

X 1

L B

M B

R B