Page 1 of 20 TOPRO CONFIDNETIAL 2003/7/31
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TP8452
PS/2 2D 3Key Mouse
Controller
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Version:1.0
Apr/2002
http://www.topro.com.tw
5 F, No.10, Prosperity Road 1, Science-Based Industrial Park, Hsinchu 300, Taiwan, R.O.C
300 10 5
TPE:
5 F, No.27, Min Chuan W. Rd. Taipei 104, Taiwan, R.O.C
104 27 5
SHENZHEN
:
Room 802, Tower A, World Trade Plaza, Fahong Rd., Fatian, Shenzhen, China
9 A 802 (518033)
H.Q.: Tel:886-3-5632515 Fax:886-3-5641728
TPE.: Tel:886-2-25856858 Fax:886-2-25941104
SHENZHEN:TEL:755-3679985 Fax:755-3679518
Page 2 of 20 TOPRO CONFIDNETIAL 2003/7/31
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TP8452
PS/2 2D 3Key Mouse
Controller
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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.
Page 3 of 20 TOPRO CONFIDNETIAL 2003/7/31
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TP8452
PS/2 2D 3Key Mouse
Controller
Applications
* Optical mouse or pen-mouse.
* Mechanical mouse or pen-mouse.
* Optomechanical mouse or pen-mouse.
* Mechanical track ball.
* Optomechanical track ball.
Page 4 of 20 TOPRO CONFIDNETIAL 2003/7/31
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TP8452
PS/2 2D 3Key Mouse
Controller
Contents
1. General Specification
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2. Pin Configurations and Package Type
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3. Pin Descriptions
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4. Functional Block Diagram
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5. Function Descriptions
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6. Absolute Maximum Ratings
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7. DC Electrical Characteristic
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8. AC Electrical Characteristic
P. 18 ---
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9. Application Diagrams
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