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PDF EM84502BM Data sheet ( Hoja de datos )

Número de pieza EM84502BM
Descripción PS/2 MOUSE ENCODER
Fabricantes ELAN Microelectronics Corp 
Logotipo ELAN Microelectronics Corp Logotipo



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No Preview Available ! EM84502BM Hoja de datos, Descripción, Manual

EMEM884455002
PS/2 PMS/O2 UMSOEUSCEOCNOTNRTROOLLLLEERR
GENERAL DESCRIPTION
The EM84502 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. EM84502 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
dispaly screen is thus moved frequently up and down or back and forth. This will consumes a great amount of
energy.The EM84502 PS/2 mouse controller provides noise immunity circuits to eliminate these noise
in order to reduce energy consumption.
FEATURES
• Being compatiable 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 12 ms.
• Through three key-switches input, EM84502 can exert seven different output.
• The motion detector of the EM84502 could sense 8 m/sec maximun with 200 DPI wheels.
APPLICATIONS
• Optical mouse or pen-mouse.
• Mechanical mouse or pen-mouse.
• Optomechanical mouse or pen-mouse.
• Mechanical track ball.
• Optomechanical track ball.
PIN ASSIGNMENT
EM84502AP
VDD
OP
OSC.OUT
CLK
DATA
VSS
R
1
2
3
4
5
6
7
14 OSCR
13 Y2
12 Y1
11 X2
10 X1
9L
8M
EM84502BP
VDD
OP
NC
NC
OSC.OUT
CLK
DATA
VSS
1
2
3
4
5
6
7
8
16 OSCR
15 Y2
14 Y1
13 X2
12 X1
11 L
10 M
9R
EM84502AM
VDD
OP
OSC.OUT
CLK
DATA
VSS
R
1
2
3
4
5
6
7
14 OSCR
13 Y2
12 Y1
11 X2
10 X1
9L
8M
EM84502BM*
VDD
OP
NC
NC
OSC.OUT
CLK
DATA
VSS
1
2
3
4
5
6
7
8
16 OSCR
15 Y2
14 Y1
13 X2
12 X1
11 L
10 M
9R
* This specification are subject to be changed without notice.
* (Under developed)
6.18.1998 1

1 page




EM84502BM pdf
EM84502
PS/2 MOUSE CONTROLLER
a). The system requires a response
b). An error is detected in the transmission
vii). When a command requiring a response is issued by the system ,another command should not be issue
until either the response is received or 25ms has passed.
E). PS/2 Mouse Commands Description:
There are 16 valid commands that transmits between the system and EM84502. The “FA” code is always the
first response to any valid input received from the system other than a Set Wrap Mode or Resend command.
The following table list the commands:
Hex Code
FF
FE
F6
F5
F4
F3,XX
F2
F0
EE
EC
EB
EA
E9
E8,XX
E7
E6
Command
Reset
Resend
Set Default
Disable
Enable
Set Sampling Rate
Read Device Type
Set Remote Mode
Set Wrap Mode
Reset Wrap Mode
Read Data
Set Stream Mode
Status Request
Set Resolution
Set Autospeed
Reset Autospeed
EM84502 echo code
FA,AA,00
XX,(XX,XX)
FA
FA
FA
FA,FA
FA,00
FA
FA
FA
FA,XX,XX,XX
FA
FA,XX,XX,XX
FA,FA
FA
FA
The following describes valid commands:
a). Reset ( FF )
EM84502 operation:
i). Completion the reset.
ii). Transmitted FA,AA,00 to the system.
iii). Set default:
sampling rate: 100 reports/s
non-autospeed
stream mode
2 dots/count
disable
b). Resend ( FE )
i). Any time EM84502 receives an invalid command, it returns a Resend command to the system.
ii). When EM84502 receives a Resend command, it retransmits its last packet of data. If the last packet was
a Resend command, it transmits the packet just prior to the Resend command.
iii). In stream mode, if a Resend command is received by EM84502 immediately following a 3-byte data
packet transmission to the system.
* This specification are subject to be changed without notice.
6.18.1998 5

5 Page





EM84502BM arduino
APPLICATION CIRCUIT
EM84502
PS/2 MOUSE CONTROLLER
* This specification are subject to be changed without notice.
6.18.1998 11

11 Page







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