Silan
Semiconductors

SC84510

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

PS/2 SCROLLING MOUSE

CONTROLIER

DESCRIPTION

The SC84510 Scrolling Mouse Controller is specially designed to

control PS/2 mouse device. This single chip can interface three key-

switches four photo-couples plus x-axis direct to 8042 controller.

SC84510 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 traditional mouse, a great number of noises are generated

when the grid is partially closed or opened. These noises are usually

mistaken for movement signals by traditional mouse controller and

the cursor of the display screen is thus moved frequently up and

down or back and forth. This will consume a great amount of energy.

The SC84510 mouse controller provides noise immunity circuits to

eliminate these noises in order to reduce energy consumption.

FEATURES

* Using 50k

5% resistor for RC oscillation.

* Compatible with legacy PS/2 mouse.

* Compatible with Microsoft scrolling mouse.

* Built-in noise immunity circuit.

* Built-in current comparator for photo-couples input.

* Built-in three steps dynamic input impedance.

* Three key-switches and four photo-couples inputs.

* Both key-press and key-release debounce interval 12 ms.

* The sampling rate of motion detector is about 65KHz.

DIP-16

* 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)

ORDERING INFORMATION

SC84510AP

DIP-16 Package, Photo couples input. (Z/1)

SC84510BP

DIP-16 Package, Key-switches input.

SC84510CP

DIP-16 Package, Voltage-sensing input.

SC84510DP

DIP-16 Package, Mechanical input. (Z/1)

SC84510EP

DIP-16 Package, Photo couples input. (Z/4)

SC84510FP

DIP-16 Package, Mechanical input. (Z/2)

Silan
Semiconductors

SC84510

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

PIN CONFIGURATIONS

8
4510A

/
B

/
C

/
E

/
F

VDD

OSC OUT

CLK

DATA

OPT

VSS

OSCR

BLOCK DIAGRAM

THREE TYPES SELECTOR

COMPARATOR

VOLTAGE

SENSOR

KEY-SWITCH

DETECTOR

Z-AXIS COUNTER

COUNTER

MULTIPLEXER

DATA

I/O

TE
CTO

NCE

PAR

AT
OR

COMMAND

STATUS

TIMING

CONTROLLER

SYSTEM CLOCK GENERATOR

RC & CRYSTAL OSCILLATION

OPT

OSCR

OSC.OUT

DATA

CLK

Silan
Semiconductors

SC84510

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

ABSOLUTE MAXIMUM RATINGS

(Tamb=25

C, unless otherwise specified)

Characteristic

Symbol

Value

Unit

Temperature Under Bias

OPR

0 ~ 70

Storage Temperature range

STR

-65 ~ +150

Input Voltage

-0.3 ~ +6.0

Output Voltage

-0.3 ~ +6.0

DC ELECTRICAL CHARACTERISTICS

(Tamb=25~70

Parameter

Symbol

Min

Typ

Max

Unit

Operating Voltage

4.5

5.5

Operating Current

(No Load)

Iop

1.2

CLK, DATA

Positive-going Threshold Voltage

Vt+

0.6V

0.8 V

CLK, DATA

Negative-going Threshold Voltage

Vt-

0.2 V

0.4 V

DATA, CLK Input Current (pull up resistor)

(Vin=0V)

Idc

0.56

1.86

DATA, CLK Low Output Voltage

(Iprl=-4mA)

Vprl

0.4

X1, X2, Y1, Y2, Z1, Z2 (Photo Mode)

Low Input Reference Current

Ipl

X1, X2, Y1, Y2, Z1, Z2 (Photo Mode)

High Input Reference Current

Iph

110

X1, X2, Y1, Y2, Z1, Z2 (Photo Mode)

Input Current

(Input Impedance) (80

Vpi

0.8

1.2

X1, X2, Y1, Y2, Z1, Z2 (Photo Mode)

Input Current

(Input Impedance) (500

Vpi

1.5

2.8

L, M, R, OPT, Z1, Z2 (Key Mode) Input Low Voltage

Vail

0.3 V

L, M, R, OPT, Z1, Z2 (Key Mode) Input High Voltage

Vaih

0.7 V

L, M, R, Z1, Z2 (Key & Voltage Mode)

Input Resistor

(Vin=V

)

Rmi

310

OPT Input Resistor

(Vin=V

)

Rxi

133

400

OPT High Output Current

(Vin=V

)

Vopt

4.5

L, M, R, X1, X2, Y2, Y2, Z1, Z2

Input Leakage Current

(Vin=0V)

Iil

-1.0

=4.5V

3.2

=5V

4.5

OPT High Output Current (Iopt=10mA)

=5.5V

Idc

5.5

Silan
Semiconductors

SC84510

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

Note:

1. All voltage in above table are compared with VSS.

2. All parameters in above table are tested under VDD=5V.

3. CLK & DATA output gates are open drains that connect to pull up resistors.

X1, X2, Y1, Y2 input impedance

1.0

2.0

3.0

4.0

5.0

UNIT:K

MAX.

TYP.

MIN.

7.0

8.0

9.0

6.0

2.0

3.0

4.0

1.0

10.0

15.0

16.0

12.0

13.0

14.0

11.0

VOLTAGE (LIN)

10.0M

AC ELECTRICAL CHARACTERISTICS

(Tamb=25~70

Parameter

Symbol

Min

Typ

Max

Unit

Oscillating Frequency

Fosc

34.3-10%

34.3

34.3+10% kHz

Key Debounce

Tkd

Rising Edge Crossed Width Fosc=35KHz

14.3

Falling Edge Crossed Width

14.3

Mouse CLK Active Time

Tmca

42.9

Mouse CLK Inactive Time

Tmci

42.9

Mouse Sample DATA from CLK rising Edge

Tmdc

14.3

System CLK Active Time

Tsca

42.9

System CLK Inactive Time

Tsci

42.9

Time from DATA Transition to Falling Edge of CLK

Tsdc

14.3

Time from rising Edge of CLK to DATA Transition

Tscd

28.6

Time to mouse Inhibit after the 11th CLK to ensure mouse does

not start another Transmission

Tpi

The AC timings are measured under using 35KHz system clock signal.

Silan
Semiconductors

SC84510

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

PIN DESCRIPTION

Pin Name

I/O

Description

OPT

I/O

INPUT: 200k

pull low to V

When OPT is connected to V

, SC84510 will enter test mode. In test mode, L will

be the output of X1, while M will be the output of X2. Toggling R key can change

these output to be Y1, Y2 or Z1, Z2 respectively.

OUTPUT: 2kHz Z-axis LED-driving source.

"1" = V

, "0" = floating

High duty is about 60

OSC OUT

OSCR

RC mode oscillation with 50k

resistor.

CLK

I/O

Connect to 8042 auxiliary port CLK line.

DATA

I/O

Connect to 8042 auxiliary port DATA line.

Three key-switches inputs.

200k

resistor pull low.

Three step dynamic input impedance.

Use current comparator to measure photo-couples "ON", or "OFF".

Z-axis input.

Photo mode: Three steps dynamic input impedance. Current comparator input.

Key mode: 200k

resistor pull low. 7 levels increased by "M" key.

Voltage mode: 200k

resistor pull low. 7 levels voltage comparator.

Mechanical mode: 13.2k

resistor pull low.

Negative power.

Power line.

Silan
Semiconductors

SC84510

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

FUNCTION DESCRIPTIONS

1. LEGACY PS/2 MOUSE OPERATING

(A) Operating mode

There are four operating modes in PS/2 mouse:

(a) Reset Mode:

In this mode a self-test is initiated during power-on or by a Reset command. After reset signal, PS/2 mouse

will send:

a Completion code AA & ID code 00.

b Set default:

* sampling rate: 100 reports/s

* non-autospeed

* stream mode

* 2 dot/count

* disable

(b) 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

Data is transmitted only in response to a Read Data command.

(d) Wrap Mode:

Any byte of data sent by the system, except hex EC (Reset wrap mode) or hex FF (Reset), is returned by

SC84510.

(B) PS/2 Mouse Data Report:

(a) In stream mode: A data report is sent at the end of a sample interval.

(b) In remote mode: A data report is sent in response to Read Data command.

Byte

Bit

Description

Left button status; 1 = pressed

Right button status; 1 = pressed

Middle button status; 1 = pressed

Reserve

X data sign; 1 = negative

Y data sign; 1 = negative

X data overflow; 1 = overflow

Y data overflow; 1 = overflow

0~7

X data (D0~D7)

0~7

Y data (D0~D7)

Silan
Semiconductors

SC84510

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

(a) SC84510 generates the clocking signal when sending data to and receiving data from the system.

(b) The system requests SC84510 receive system data output by forcing the DATA line to an inactive level and

allowing CLK line to go to an active level.

Bit

Function

Start bit (always 0)

2~9

Data bits (D0~D7)

Parity bit (odd parity)

Stop bit (always 1)

(d) Data Output (data from SC84510 to system):

If CLK is low (inhibit status), data is no transmission.

If CLK is high and DATA is low (request-to-send), data is updated. Data is received from the system and

no transmission are started by SC84510 until CLK and DATA both high. If CLK and DATA are both high, the

transmission is ready. DATA is valid prior to the falling edge of CLK and beyond the rising edge of CLK.

During transmission, SC84510 check for line contention by checking for an inactive level on CLK at intervals

not to exceed 100

sec. Contention occurs when the system lowers CLK to inhibit SC84510 output after

SC84510 has started a transmission. If this occurs before the rising edge of the tenth clock, SC84510 internal

store its data in its buffer and returns DATA and CLK to an active level. If the contention does not occur by the

tenth clock, the transmission is complete.

Following a transmission, the system inhibits SC84510 by holding CLK low until it can service the input or

until the system receives a request to send a response from SC84510.

(e) Data Input (from system to SC84510):

System first check if SC84510 is transmitting data. If SC84510 is transmitting, the system can override

the output forcing CLK to an inactive level prior to the tenth clock. If SC84510 transmission is beyond the

tenth clock, the system receives the data. If SC84510 is not transmitting or if the system choose to override

the output, the system force CLK to an inactive level for a period of not less than 100

sec while preparing for

output. When the system is ready to output start bit (0), it allows CLK go to active level. If request-to-send is

detected, SC84510 clocks 11 bits. Following the tenth clock SC84510 checks for an active level on the DATA

line, and if found, force DATA low, and clock once more. If occurs framing error, SC84510 continue to clock

until DATA is high, then clocks the line control bit and request a Resend. When the system sends out a

command or data transmission that requires a response, the system waits for SC84510 to response before

sending its next output.

Silan
Semiconductors

SC84510

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

(D) PS/2 Mouse Error Handling:

(a) A Resend command (FE) following receipt of an invalid input or any input with incorrect parity.

(b) If two invalid input are received in succession, an error code of hex FC send to the system.

(d) SC84510 receives a Resend command (FE), it transmit its last packet of data.

(e) In the stream mode "Resend" is received by SC84510 following a 3-byte data packet transmission to the

system. SC84510 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) 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 SC84510. 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:

The following describes valid commands:

Hex Code

Command

SC84510 echo code

Reset

FA, AA, 00

Resend

XX, (XX, XX)

Set Default

Disable

Enable

F3, XX

Set Sampling Rate

FA, FA

Read Device Type

FA, 00

Set Remote Mode

Set Wrap Mode

Reset Wrap Mode

Read Data

FA, XX, XX, XX

Set Stream Mode

Status Request

FA, XX, XX, XX

E8, XX

Set Resolution

FA, FA

Set Auto-speed

Reset Auto-speed

Silan
Semiconductors

SC84510

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

The following describes valid command:

(a) Reset (FF)

SC84510 operation:

a Completion the reset.

b Transmitted FA, AA, 00 to the system.

c Set default:

sampling rate: 100 reports/s

non-auto-speed

stream mode

2 dots/count

disable

(b) Resend (FE)

a. Any time SC84510 receives an invalid command; it returns a Resend command to the system.

b. When SC84510 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.

c. In stream mode if a Resend command is received by SC84510 immediately following a 3-byte data

packet transmission to the system.

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 SC84510.

(e) Enable (F4)

Begins transmissions, if in stream mode.

(f) Set Sampling Rate (F3, XX)

In the stream mode, this command sets the sampling rate to the value indicated by byte hex XX, shown in

following:

Second byte XX

Sample Rate

10/sec

20/sec

40/sec

60/sec

80/sec

100/sec

200/sec

Silan
Semiconductors

SC84510

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

(g) Read Device Type (F2)

SC84510 always echoes " FA, 00 " following this command.

(h) Set Remote Mode (F0)

Data values are reported only in response to a Read Data command.

(i) Set Wrap Mode (EE)

Wrap mode remains until Reset (FF) or Reset Wrap Mode (EC) is received.

(j) Reset Wrap Mode (EC)

SC84510 returns to the previous mode of operation after receiving this command.

(k) Read Data (EB)

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 after a data transmission.

(l) Set Stream Mode (EA)

This command sets SC84510 in stream mode.

(m) Status Request (E9)

When this command is issued by the system, SC84510 respond with a 3-byte status report as follows:

Byte

Bit

Description

1 = Right button pressed

1 = Middle button pressed

1 = Left button pressed

Reserved

0 = Normal speed, 1 = Auto-speed

0 = Disabled, 1 = Enabled

0 = stream mode, 1 = Remote mode

Reserved

0~7

Current resolution setting (D0~D7)

0~7

Current sampling rate (D0~D7)

(n) Set Resolution (E8, XX)

SC84510 provides four resolutions selected by the second byte of this command as follows:

Second Byte XX

Resolution

8 dots/count

4 dots/count

2 dots/count

1 dot/count

(o) Set Auto-speed (E7)

Silan
Semiconductors

SC84510

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

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

2.0*N

(p) Reset Auto-speed (E6)

This command restores normal speed.

2. MICROSOFT PS/2 SCROLLING MOUSE MODE:

(A) Entering procedure: Except in WRAP mode, While SC84520 received the following consecutive command.

(a) F3 C8

---- set sampling rate 200/sec

(b) F3 64

---- set sampling rate 100/sec

---- set sampling rate 80/sec

(B) Operating:

(a) All of the command in legacy mode still is valid.

(b) The ID code of read device type command (F2) will changed from "00" to be "03".

Byte

Bit

Description

Left button status; 1 = pressed

Right button status; 1 = pressed

Middle button status; 1 = pressed

Reserve

X data sign; 1 = negative

Y data sign; 1 = negative

X data overflow; 1 = overflow

Y data overflow; 1 = overflow

0 - 7

X data (D0 D7)

0 - 7

Y data (D0 D7)

0 - 7

Z data (D0 D7)

Silan
Semiconductors

SC84510

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

There are two ways to exit:

(a) Power off.

(b)Reset command (FF).

3. Z-AXIS INPUT FUNTION: The Z0 ~ Z7 limit value is

(A) Photo couples input: Z-axis counter accumulates the Z1, Z2 phase changed by movement. This mode

includes noise immunity.

Z/1: 1 dot per count.

Z/4: 4 dots per count. Counted by Z1=1, Z2=1 phase, the wheel should stay at Z1=0, Z2=0 phase.

(B) Key-switches input: Pressing Z1, Z2 will start to fill the Z-axis counter with the value beginning at one.

Toggling "M" key can increase the value any time by one. The limit value is

The relationship between the value and the transmission rate as follow:

Value

Rate per second

2.7

6.4

9.2

12.8

switch mode. The relationship between the value of Z-axis counter and the voltage as follows:

Value

Voltage

1.0V 1.6V

1.6V 2.2V

2.2V - 2.8V

2.8V 3.4V

3.4V 4.0V

4.0V 4.6V

4.6V

Under V

= 5V condition

(D) Mechanical mode: The function is the same as photo couples input mode, except there is no noise immunity.

Z/1: 1 dot per count.

Z/2: 2 dots per count. Counted by Z2 changing phase.

Silan
Semiconductors

SC84510

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

TIMING DIAGRAM

X1(Y1)

X2(Y2)

CLK

DATA

CLK

DATA

Inhibit

Start

Bit

Bit0-Bit7

Parity

Bit

Line

Control

Bit

Stop

Bit

Start

Bit

Bit0-Bit7

Parity

Bit

Stop

Bit

Tscl

Tsca

Tscd

Tsdc

Tpi

Tmdc

Tmca

Tmci

1st

CLK

2rd

CLK

9th

CLK

10th
CLK

11th
CLK

1st

CLK

2nd

CLK

10th
CLK

11th
CLK

(2) PS/2 Mouse

(B) Sending Data

(A) Receiving Data

(1) Photo-couples pulse width

AC TIMING POINT

-2.6

+0.4V

+1.6V

+0.8V

-0.8V

L, M, R PIN

CLK, DATA PIN

Input:

X1, X2, Y1, Y2 PIN

Output:

DATA
CLK PIN

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