EM84520EP ELAN Microelectronics Corp, EM84520EP Datasheet

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EM84520EP

Manufacturer Part Number
EM84520EP
Description
2-in-one scrolling mouse controller
Manufacturer
ELAN Microelectronics Corp
Datasheet

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EM84520EP
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BL
Quantity:
6 259
GENERAL DESCRIPTION
FEATURES
APPLICATION
PIN ASSIGNMENT
* This specification are subject to be changed without notice.
The EM84520 Scrolling Mouse Controller is specially designed to control serial mouse or PS/2 mouse device.
This single chip can interface three key-switches and 4 X-Y photo-couples plus Z-axis directly to RS-232C or
8042 controller.
There are four types Z-axis inputs used to implement scrolling mouse functionality.
• Using 50k
• Compatible with legacy PS/2 mouse.
• Compatible with Microsoft serial scrolling mouse.
• Compatible with Microsoft PS/2 scrolling mouse.
• Serial or PS/2 port auto-detect.
• 100 bytes PnP ID code could be filled by code layer.
• Built-in noise immunity circuit.
• The sampiling rate of motion detector is up to 65KHz.
• Built-in three zener diodes : one in VDD to VSS, two in RTS to VDD.
• CMOS push-pull RXD output.
• Built-in current comparator for photo-couples input.
• Built-in three step dynamic input impedance.
• Three key-switches and four photo-couples inputs.
• RTS debouncing circuit included.
• Photo couple test mode included.
• Low power dissipation.
• Six types Z direction input:
• Package type:
• Serial PnP scrolling mouse.
• PS/2 scrolling mouse.
• Combo PnP scrolling mouse.
1. Photo couples input. (Z/1)
2. Key-switches input.
3. Voltage-sensing input.
EM84520AP : 16DIP, Photo couples input. (Z/1) EM84520DP: 16DIP, Mechanical input. (Z/1)
EM84520BP : 16DIP, Key-switches input.
EM84520CP : 16DIP, Voltage-sensing input.
1% resistor for RC oscillation.
DATA/RXD
EM84520A/B/C/D/E/F
OSC.OUT
CLK/RTS
OPT
V
VSS
Z1
Z2
DD
1
2
3
4
5
6
7
8
2-IN-ONE SCROLLING MOUSE CONTROLLER
4. Mechanical input. (Z/1)
5. Photo couples input. (Z/4)
6. Mechanical input. (Z/2)
16
15
14
13
12
11
10
9
EM84520EP : 16DIP, Photo couples input. (Z/4)
EM84520FP : 16DIP, Mechanical input. (Z/2)
OSCR
Y2
Y1
X2
X1
L
M
R
6.28.1999
EM84520
1

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EM84520EP Summary of contents

Page 1

... Combo PnP scrolling mouse. PIN ASSIGNMENT * This specification are subject to be changed without notice. 2-IN-ONE SCROLLING MOUSE CONTROLLER 4. Mechanical input. (Z/1) 5. Photo couples input. (Z/4) 6. Mechanical input. (Z/2) EM84520EP : 16DIP, Photo couples input. (Z/4) EM84520FP : 16DIP, Mechanical input. (Z/2) EM84520A/B/C/D/E OSCR DD OSC ...

Page 2

FUNCTIONAL BLOCK DIAGRAM OPT OSC.OUT PIN DESCRIPTIONS Symbol I/O OPT I/O OSC.OUT O OSCR I CLK/RTS I/O DATA/RXD I ...

Page 3

FUNCTION DESCRIPTIONS (I) Serial Scrolling Mouse : In Microsoft mode, the transmission cycle consists of four bytes in one report. Each byte contains one start bit, 7 data bits and two stop bits. The first byte contains "L", "R" key ...

Page 4

Stream Mode: The maximum rate of transfer is the programmed sample rate. Data report is transmitted if (a) switch is pressed (b) movement has been detect c. Remote Mode: ...

Page 5

C) PS/2 mouse Data Transmission: a). EM84520 generates the clocking signal when sending data to and receiving data from the system. b). The system requests EM84520 receive system data output by forcing the DATA line to an inactive level and ...

Page 6

The counter accumulators are cleared after receiving any command except “Resend”. d). EM84520 receives a Resend command ( transmit its last packet of data. e). In the stream mode “Resend” is received by EM84520 following a ...

Page 7

Set default: sampling rate: 100 reports/s non-autospeed stream mode 2 dots/count disable b). Resend ( FE ) a). Any time EM84520 receives an invalid command, it returns a Resend command to the system. b). When EM84520 receives a Resend ...

Page 8

This command is executed in either remote or stream mode. The data is transmitted even if there has been no movement since the last report or the button status is unchanged. Following a Read Data command, the registers are cleared ...

Page 9

Microsoft PS/2 scrolling mouse mode: (A) Entering procedure: Except in WRAP mode, while EM84520 received the following consecutive command ---- set sampling rate 200/sec ii ---- set sampling rate 100/sec iii ---- ...

Page 10

Value (d) Voltage-sensing mode : There are 7 voltage levels in Z1, Z2 input. The transmission table is the same as key-switches mode. The relationship between the value of Z-axis counter and the ...

Page 11

ABSOLUTE MAXIMUM RATINGS Parameter Temperature under bias Storage temperature range Supply voltage Power dissipation DC ELECTRICAL CHARACTERISTICS (T Parameters X1,X2,Y1,Y2,Z1,Z2 (photo mode) low input reference current X1,X2,Y1,Y2,Z1,Z2 (photo mode) high input reference current X1,X2,Y1,Y2,Z1,Z2 (photo mode) input current (input impedance) ...

Page 12

PS/2 mouse mode : (T = Parameters Operating voltage Operating current CLK, DATA postive-going threshold voltage CLK, DATA negative-going threshold voltage DATA, CLK input current DATA,CLK low output voltage Serial mouse mode : (T =25 ...

Page 13

Serial mouse mode : Parameters Oscillating Frequency Key Debounce Rising Edge Crossed Width Falling Edge Crossed Width Transmission Time Start bit Time Data bit time Stop bit Time Mode code delay Time X1, X2,Y1,Y2, Z1, Z2 (photo mode) Input Impedance ...

Page 14

TIMING DIAGRAM (A) PS/2 mouse mode : (A) Photo-couples pulse width X1(Y1) X2(Y2) (B) Receiving Data Inhibit CLK DATA Start (C) Sending Data CLK DATA * This specification are subject to be changed without notice. 2-IN-ONE SCROLLING MOUSE CONTROLLER Tr ...

Page 15

Serial mouse mode : (A) RXD output : Key in/release Mouse RXD (B) Bytes structure : RXD (C) Bits structure : RXD LINE Data Bit no. (D) PnP ID code echo timing : RTS RXD "4D" code Bit no ...

Page 16

APPLICATION CIRCUIT * This specification are subject to be changed without notice. 2-IN-ONE SCROLLING MOUSE CONTROLLER EM84520 6.28.1999 16 ...

Page 17

This specification are subject to be changed without notice. 2-IN-ONE SCROLLING MOUSE CONTROLLER EM84520 6.28.1999 17 ...

Page 18

This specification are subject to be changed without notice. 2-IN-ONE SCROLLING MOUSE CONTROLLER EM84520 6.28.1999 18 ...

Page 19

This specification are subject to be changed without notice. 2-IN-ONE SCROLLING MOUSE CONTROLLER EM84520 6.28.1999 19 ...

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