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SC84520 Schematic ( PDF Datasheet ) - Silan Microelectronics

Teilenummer SC84520
Beschreibung TWO IN ONE SCROLLING MOUSE CONTROLLER
Hersteller Silan Microelectronics
Logo Silan Microelectronics Logo 




Gesamt 19 Seiten
SC84520 Datasheet, Funktion
Silan
Semiconductors
SC84520
TWO IN ONE SCROLLING MOUSE
CONTROLLER
DESCRIPTION
The SC84520 Scrolling Mouse Controller id specially designed to
control serial mouse or PS/2 mouse device. This single chip can
interface three key-switched and 4 X-Y photo-couples plus Z-axis
directly 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 sampling rate of motion detector is up to 65 kHz
*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-coupled inputs
*RTS debouncing circuit include
*Photo couple test mode include
*Low power dissipation
*Six types Z direction input:
1. Photo couples input (Z/1)
2. Key-switches input
3. Voltage-sensing input
4. Mechanical input(Z/1)
5. Photo couples input (Z/4)
6. Mechanical input (Z/2)
DIP-16
*Package type:
SC84510AP: 16DIP, Photo coupled
input(Z/1)
SC84510BP: 16DIP, Key-switches input
SC84510CP: 16DIP, Voltage-sensing
Input
SC84510DP: 16DIP, Mechanical input
(Z/1)
SC84510EP: 16DIP, Photo couples input
(Z/4)
SC84510FP: 16DIP, Mechanical input
(Z/2)
APPLICATIONS
*Serial PnP scrolling mouse
*PS/2 scrolling mouse
*Combo PnP scrolling mouse
HANGZHOU SILAN MICROELECTRONICS CO.,LTD.
Rev: 1.0 2000.12.31
1






SC84520 Datasheet, Funktion
Silan
Semiconductors
X1, X2, Y1, Y2 INPUT IMPEDANCE
SC84520
UNIT:K
16.0
15.0
14.0
13.0
12.0
11.0
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
MAX.
TYP.
MIN.
1.0
2.0 3.0
INPUT VOLTAGE
4.0
5.0
FUNCTION DESCRIPTIONS
1.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 status and four bits of the two most significant bits
in horizontal counter and vertical counter. The second byte represents the value accumulated by horizontal
counter, the third byte is the data of the vertical counter, The last byte contains “M” key status and Z-axis value.
The vertical data is transmitted in 2’s complement.
Output byte arrange:
Bit No.
1st Byte
2nd Byte
3rd Byte
4th Byte
……
……
……
……
……
6
1
0
0
0
543210
L R V7’ V6’ H7 H6
H5 H4 H3 H2 H1 H0
V5’ V4’ V3’ V2’ V1’ V0’
0 M Z3 Z2 Z1 Z0
Plug & Play ID code
When RTS input from low to high, SC84520 will send a string ID code. Customer can specify the contains of the
code area and the total length below 100 bytes by changing the code layer.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD.
Rev: 1.0 2000.12.31
6

6 Page









SC84520 pdf, datenblatt
Silan
Semiconductors
SC84520
l. Status Request (E9)
When this command is issued by the system, SC84520 respond with a 3-byte status report as follows:
Byte
Bit
Description
1
2
3
m. Set Resolution (E8, XX)
0 1 = Right button pressed
1 1 = Middle button pressed
2 1 = Left button pressed
3 Reserved
4 0 = Normal speed, 1 = Autospeed
5 0 = Disabled, 1 = Enable
6 0 = Stream mode, 1 = Remote mode
7 Reserved
0-7 Current resolution setting (D0 – D7)
0-7 Current sampling rate (D0 – D7)
SC84520 provides four resolutions selected by the second byte of this command as follows:
Second Byte XX
Resolution
n. Set Autospeed (E7)
00
01
02
03
8 dots/count
4 dots/count
2 dots/count
1 dot/count
At the end of a sample interval in the stream mode, The current X and Y data values are converted new
values. The sign bits are not involved in this conversion. The conversion is only in stream mode. The
relationship between the input and output count follows:
Input
Output
o. Reset Autospeed (E6)
0
1
2
3
4
5
N( 6)
0
1
1
3
6
9
2.0*N
This command restore normal speed.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD.
Rev: 1.0 2000.12.31
12

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