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EM84520EP Schematic ( PDF Datasheet ) - ELAN Microelectronics Corp

Teilenummer EM84520EP
Beschreibung 2-IN-ONE SCROLLING MOUSE CONTROLLER
Hersteller ELAN Microelectronics Corp
Logo ELAN Microelectronics Corp Logo 




Gesamt 19 Seiten
EM84520EP Datasheet, Funktion
EM84520
2-IN-ONE SCROLLING MOUSE CONTROLLER
Preliminary
GENERAL DESCRIPTION
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.
FEATURES
• Using 50kΩ ±1% resistor for RC oscillation.
• 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:
1. Photo couples input. (Z/1)
4. Mechanical input. (Z/1)
2. Key-switches input.
5. Photo couples input. (Z/4)
3. Voltage-sensing input.
6. Mechanical input. (Z/2)
• Package type:
EM84520AP : 16DIP, Photo couples input. (Z/1) EM84520DP: 16DIP, Mechanical input. (Z/1)
EM84520BP : 16DIP, Key-switches input.
EM84520EP : 16DIP, Photo couples input. (Z/4)
EM84520CP : 16DIP, Voltage-sensing input. EM84520FP : 16DIP, Mechanical input. (Z/2)
APPLICATION
• Serial PnP scrolling mouse.
• PS/2 scrolling mouse.
• Combo PnP scrolling mouse.
PIN ASSIGNMENT
EM84520A/B/C/D/E/F
VDD
OSC.OUT
Z1
Z2
CLK/RTS
DATA/RXD
OPT
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.
6.28.1999 1






EM84520EP Datasheet, Funktion
EM84520
2-IN-ONE SCROLLING MOUSE CONTROLLER
Preliminary
c). The counter accumulators are cleared after receiving any command except “Resend”.
d). EM84520 receives a Resend command ( FE ), it transmit its last packet of data.
e). In the stream mode “Resend” is received by EM84520 following a 3-byte data packet transmission
to the system. EM84520 resend the 3-byte data packet prior to clearing the counter.
f). A response is sent within 25 ms if
a). The system requires a response
b). An error is detected in the transmission
g). If EM84520 is in the stream mode :
a). The system disables EM84520 before issuing any command requiring a response.
b). 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 EM84520. 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 Auto-speed
Reset Auto-speed
EM84520 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 )
EM84520 operation:
a). Completion the reset.
b). Transmitted FA, AA, 00 to the system.
* This specification are subject to be changed without notice.
6.28.1999 6

6 Page









EM84520EP pdf, datenblatt
PS/2 mouse mode : (TA=25°C to 70°C)
Parameters
EM84520
2-IN-ONE SCROLLING MOUSE CONTROLLER
Preliminary
Sym. Min. Typ. Max.
Unit
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
VDD 4.5 5 5.5
(no load)
IOp
- -1
Vt+ 3.2 - 3.8
Vt - 1.2 - 1.9
Idc 0.56 - 1.86
(Vin=0V )
(Iprl=-2mA) Vprl
-
- 0.4
V
mA
V
V
mA
V
Serial mouse mode : (TA=25°C to 70°C)
Parameters
Operating voltage
Operating current
Operating current
RTS operating current
RTS operating current
RXD high output voltage
RXD low output voltage
RTS high input voltage
RTS low input voltage
(VDD=5.4, RTS=VDD)
(VDD=6.2, RTS=VDD)
(VDD=5.6, RTS=11V)
(VDD=5.4, RTS=12.5V)
(Vrh=Vrts-2.6V)
(Vrl=Vss+2.6V)
* All parameters in above table are compared with VSS.
Sym.
VDD
VRTS
Iop1
Iop2
Irts1
Irts2
Irh
Irl
Vrts+
Vrts-
Min.
4
-
-
3
-
4
2
-
9.6
-
Typ.
5.6
12.2
-
-
-
-
-
-
-
-
Max.
6.2
13
1
-
1.8
-
-
-2
-
6.8
Unit
V
V
mA
mA
mA
mA
mA
mA
V
V
AC ELECTRICAL CHARACTERISTICS (TA=25°C to 70°C)
PS/2 mouse mode :
Parameters
Sym. Min.
Oscillating Frequency
Key Debounce
Rising Edge Crossed Width
Falling Edge Crossed Width
Mouse CLK Active Time
Mouse CLK Inactive Time
Time that Mouse Sample DATA from
CLK rising Edge
System CLK Active Time
System CLK Inactive Time
Time from DATA Transition to Falling Edge of CLK
Time from rising Edge of CLK to DATA Transition
Time to mouse Inhibit after the 11th CLK to
ensure mouse does not start another Transmission
Fosc
Tkd
Tr
Tf
Tmca
Tmci
Tmdc
37.0-3%
-
13.5
13.5
-
-
-
Tsca -
Tsci -
Tsdc -
Tscd -
Tpi 0
Typ.
37.0
12
-
-
40.5
40.5
13.5
40.5
40.5
13.5
27.0
-
* This specification are subject to be changed without notice.
Max.
37.0+3%
-
-
-
-
-
-
-
-
-
-
50
Unit
KHz
ms
us
us
us
us
us
us
us
us
us
us
6.28.1999 12

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