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PDF SC84502 Data sheet ( Hoja de datos )
| Número de pieza | SC84502 | |
| Descripción | PS/2 MOUSE CONTROLLER | |
| Fabricantes | Silan Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC84502 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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Silan
Semiconductors
SC84502
PS/2 MOUSE CONTROLLER
DESCRIPTION
The SC84502 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. SC84502 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 the accuracy.
In the conventional mouse, a great number of noises are
generated when the grid is partially closed or opened. These noise
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 SC84502 PS/2 mouse controller provides
noise immunity circuits to eliminate these noise In order to reduce
energy consumption.
DIP-14
DIP-16
FEATURES
* Being compatible with PS/2 mouse mode
* Built-in noise immunity circuit
* Low power dissipation
* RC oscillation
* Three key-switches and four photo-couples inputs
* Both key-press and key-release debounce interval 12ms
* Through three key-switches input, SC84502 can exert seven
different output
* The motion detector of the SC84502 could sense 8m/sec
maximum with 200 DPI wheels
ORDERING INFORMATION
SC84502AP
SC84502BP
DIP-14 PACKAGE
DIP-16 PACKAGE
APPLICATIONS
* Optical mouse or pen-mouse
* Mechanical mouse or pen-mouse
* Optomechanical mouse or pen-mouse
* Mechanical track ball
* Optomechanical track ball
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
1
1 page  
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Silan
Semiconductors
SC84502
FUNCTION DESCRIPTIONS
1. OPERATING MODE
There are four operating modes in PS/2 mouse:
i) Reset Mode:
In this mode a self-test is initiated during power-on or by a Reset command. After reset signal, PS/2 mouse
will send:
1) Completion code AA&ID code 00.
2) Set default:
sampling rate: 100 reports/s
non-autospeed
stream mode
2 dot/count
disable
ii) Stream Mode:
The maximum rate of transfer is the programmed sample rate.
Data report is transmitted if
1) switch is pressed
2) movement has been detect
iii) Remote Mode:
Data is transmitted only in response to a Read Data command.
iv) Wrap Mode:
Any byte of data sent by the system, except hex EC(Reset wrap mode) or hex FF(Reset), is returned by
SC84502.
2. PS/2 MOUSE DATA REPORT
i) In stream mode: A data report is sent at the end of a sample interval.
ii)In remote mode: A data report is sent in response to Read Data command.
iii) Data report format:
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
5
5 Page 
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Silan
Semiconductors
TIMING DIAGRAM
(1) Photo-couples pulse width
SC84502
X1(Y1)
X2(Y2)
Tr
Tf
(2) PS/2 Mouse
(A) Receiving Data
CLK
Inhibit
1st 2rd 9th 10th 11th
CLK CLK CLK CLK CLK
DATA
(B) Sending Data
Tmca
Tmdc
Tmci
Start
Bit
Bit0-Bit7
Parity
Bit
Stop
Bit
Line
Control
Bit
CLK
1st
CLK
2nd
CLK
10th
CLK
11th
CLK
DATA
Tscl
Tsdc Tscd
Tsca
Start
Bit
Bit0-Bit7
Tpi
Parity
Bit
Stop
Bit
AC TIMING POINT
Output:
DATA
VDD-2.6
CLK PIN(PS/2 mouse mode)
Input:
X1, X2, Y1, Y2 PIN
CLK, DATA PIN
L, M, R PIN
VSS+0.4
VSS+1.6
VSS
VDD-0.8
VSS+0.8
VDD
VSS
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SC84502.PDF ] | |
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