EM84502BP EMC [ELAN Microelectronics Corp], EM84502BP Datasheet

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EM84502BP

Manufacturer Part Number
EM84502BP
Description
PS/2 MOUSE ENCODER
Manufacturer
EMC [ELAN Microelectronics Corp]
Datasheet
GENERAL DESCRIPTION
FEATURES
APPLICATIONS
PIN ASSIGNMENT
* This specification are subject to be changed without notice.
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.
• 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.
• Optical mouse or pen-mouse.
• Mechanical mouse or pen-mouse.
• Optomechanical mouse or pen-mouse.
• Mechanical track ball.
• Optomechanical track ball.
OSC.OUT
OSC.OUT
DATA
DATA
CLK
CLK
VSS
V
V
VSS
NC
NC
OP
OP
DD
DD
R
EM84502BP
EM84502AP
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
16
15
14
13
12
11
10
14
13
12
11
10
9
9
8
OSCR
Y2
Y1
X2
X1
L
M
R
OSCR
Y2
Y1
X2
X1
L
M
OSC.OUT
OSC.OUT
DATA
DATA
CLK
CLK
V
VSS
VSS
V
NC
NC
OP
OP
DD
DD
EM84502BM*
R
EM84502AM
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
16
15
14
13
12
11
10
14
13
12
11
10
9
9
8
OSCR
Y2
Y1
X2
X1
L
M
R
OSCR
Y2
Y1
X2
X1
L
M
PS/2 MOUSE CONTROLLER
PS/2 MOUSE CONTROLLER
* (Under developed)
6.18.1998
EM84502
EM84502
1

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EM84502BP Summary of contents

Page 1

... Mechanical mouse or pen-mouse. • Optomechanical mouse or pen-mouse. • Mechanical track ball. • Optomechanical track ball. PIN ASSIGNMENT EM84502AP OSC.OUT CLK DATA VSS R EM84502BP OSC.OUT CLK DATA VSS * This specification are subject to be changed without notice. EM84502AM 1 OSCR ...

Page 2

FUNCTIONAL BLOCK DIAGRAM OSCR OSC OUT PIN DESCRIPTIONS Symbol I OSCOUT O CLK I/O DATA I OSCR ...

Page 3

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 ...

Page 4

Bit 1 2 iv). Data Output ( data from EM84502 to system ): If CLK is low ( inhibit status ) , data is no transmission. If CLK is high and DATA is low ( request-to-send ), data ...

Page 5

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 ...

Page 6

Set Default ( F6 ) The command reinitializes all conditions to the power-on defaults. d). Disable ( F5 ) This command is used in the stream mode to stop transmissions from EM84502. e). Enable ( F4 ) Begins transmissions, ...

Page 7

Set Resolution ( E8,XX ) EM84502 provides four resolutions selected by the second byte of this command as follows: Second Byte o). Set Autospeed ( ...

Page 8

DC ELECTRICAL CHARACTERISTICS (T Parameters Operating voltage Operating current X,X2,Y1,Y2 low input reference current X,X2,Y1,Y2 high input reference current X,X2,Y1,Y2 input current Schmitt trigger input X,X2,Y1,Y2 input current Comparator input X,X2,Y1,Y2 input current Comparator input CLK, DATA postive-going threshold voltage ...

Page 9

AC ELECTRICAL CHARACTERISTICS (T Parameters Oscillating Frequency Key Debounce Rising Edge Crossed Width Fosc=35 KHz Falling Edge Crossed Width Fosc=35 KHz Mouse CLK Active Time Mouse CLK Inactive Time Mouse Sample DATA from CLK rising Edge System CLK Active Time ...

Page 10

Sending DATA 1st CLK CLK > Tsci > < Tsdc DATA Start Bit AC Timing point: Output DATA, CLK PIN (PS/2 mouse mode) Input: X1,X2,Y1,Y2 PIN CLK, DATA PIN L,M,R PIN EM84502 I/O pin equivalent circuit : ...

Page 11

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

Page 12

PDIP (4X) eB Symbol MIN .059 .740 E1 .259 F .290 .345 0 * This specification are subject to ...

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