TP8452CP 데이터 시트보기 (PDF) - Topro

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TP8452CP

PS/2 2D 3Key Mouse Controller

Topro 

TP8452

PS/2 2D 3Key Mouse

Controller

General Specification

General Description

The TP8452 Mouse Controller is specially designed to control PS/2 mouse device. This single chip

can interface three key-switches and four photo-couples direct to 8042. TP8452 can receive command

and echo status or data format which are compatible with IBM PS/2 mode mouse.

Key debouncing circuit is provided to prevent false entry and improve TP8452 accuracy.

In the conventional mouse, a great number of noises are generated when the grid is partially closed or

opened. These noises are usually mistaken for movement signals by conventional mouse controller

and the cursor of the display screen is thus moved frequently up and down or back and forth. This will

consumes a great amount of energy. The TP8452 PS/2 mouse controller provides noise immunity

circuits to eliminate these noises in order to reduce energy consumption.

Using the auto-speed adjusting circuits, TP8452 promotes the power of the mouse in movement. when

TP8452 moves at low speed, it will be very smooth. While at high speed, TP8452 can change the

scanning ability of the motion and detects more dots than that of at low speed. According to different

speed, the horizontal and vertical counters acquire different dots in the same distance.

Features

* Being compatible with PS/2 mouse mode.

* Including buyer testing mode.

* Auto speed with dynamic resolutions.

* Built-in noise immunity circuit.

* Low power dissipation.

* Both RC oscillating and crystal oscillating circuits provided.

* Three key-switches and four photo-couples inputs.

* Both key-press and key-release debounce interval 11 ms.

* Through three key-switch inputs, TP8452 can exert seven different output.

* PIN to PIN compatible with HM8450.

* Improved ESD protection.

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TOPRO CONFIDNETIAL

2003/7/31 Print

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