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Silan Semiconductors
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.
SC84520
FEATURES
*Using 50k 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) *Package type:
DIP-16
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
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PIN CONFIGURATIONS
VDD OSC OUT Z1 Z2 CLK/RTS DATA/RXD OPT VSS
SC84520
1 2 3 4 5 6 7 8
SC84520A/B/C/D/E/F
16 15 14 13 12 11 10 9
OSCR Y2 Y1 X2 X1 L M R
BLOCK DIAGRAM
DATA/RXD CLK/RTS
6
Z1 Z2
5
3 4 7
DETECTOR MOTION
THREE TYPES SELECTOR COMPARATOR VOLTAGE SENSOR KEY-SWITCH DETECTOR
Z-AXIS COUNTER OPT X1 X2 Y1 Y2
12 13 14 15 11 10 9
COMPARATOR
COUNTER
MULTIPLEXER
DATA I/O
L M R
DEBOUNCE
COMMAND STATUS
TIMING CONTROLLER
OSCR
16 2
SYSTEM CLOCK GENERATOR
OSC OUT
RC OSCILLATION
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ABSOLUTE MAXIMUM RATINGS (Tamb=25C, unless otherwise specified)
Characteristic
Supply Voltage Temperature Under Bias Storage Temperature range Power Dissipation TOPR PD
SC84520
Symbol
VSS
Value
-0.3 ~ +7.5 0 ~ 70 -65 ~ +150 500
Unit
V C C mW
DC ELECTRICAL CHARACTERISTICS (Tamb=25~70C)
Parameter
Operating Voltage Operating Current (VDD=5.4V, RTS=VDD, 32.768kHz, No Load) Operating Current (VDD=6.2V, RTS=VDD, 32.768kHz, No Load) Operating Current (VDD=5.4V, RTS=VDD, 3.58MHz, No Load) Operating Current (VDD=6.2V, RTS=VDD, 3.58MHz, No Load) RTS Operating Current (VDD=5.6V, RTS=11V) RTS Operating Current (VDD=5.6V, RTS=11.8V) RXD High Output Current (Vrh=Vrts-2.6V) RXD Low Output Current (Vrl=Vss+2.6V) X1,X2,Y1,Y2 Low Input Voltage X1,X2,Y1,Y2 High Input Voltage X1,X2,Y1,Y2 Input Current RTS High Input Voltage RTS Low Input Voltage Low Input Voltage, Other Pins High Input Voltage, Other Pins L,M,R,OPT Input Current Input Leakage Current RS, OSC-IN Input Leakage Current (Pull Low Resistor, Vds=5.6V) (Vin=0V) (Vin=5.6V) Rs,Osc-In,L,M,R,X1,X2,Y2,Y2,Opt (Pull Low Resistor, Vds=1.0V)
Symbol
VDD Iop Iop Iop Iop IRTS IRTS Irh Irl Vpl Vph Ipi Vth Vtl Vail Vaih Imi Iil Iih
Min
--3 -4 -3 2.0 --1.3 57 9.6 --3.5 18.6 0 -1.0
Typ
--------------------
Max
6.5 0.6 -1.6 -0.6 ---2.0 0.7 -104 -6.8 1.5 -56 1.0 0
Unit
V mA mA mA mA mA mA mA mA V V A V V V V A A A
NOTE: *All voltages in above table are compared with VSS. *All parameters in above table are tested under VDD=5.6V
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AC ELECTRICAL CHARACTERISTICS (Tamb=25~70C)
PS/2 mouse mode:
Parameter
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
SC84520
Symbol
Fosc Tkd Tr Tf Tmca Tmci Tmdc Tsca Tsci Tsdc Tscd Tpi
Min
37-3% -13.5 13.5 -------0
Typ
37 12 --40.5 40.5 13.5 40.5 40.5 13.5 27 --
Max
37+3% ----------50
Unit
kHz ms s s s s s s s s s s
Serial mouse mode:
Parameter
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
Symbol
Fosc Tkd Tr Tf Tmx Ts Td Tp Trd
Min
32.4-3% -15.4 15.4 ----11
Typ
32.4 13 --33.33 833.3 833.3 833.3 --
Max
32.4+3% -------14
Unit
kHz ms s s ms s s s ms
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PIN DESCRIPTION
Pin Name I/O
INPUT: 200k pull low to VSS.
SC84520
Description
When OPT is connected to VDD, SC84520 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 OPT I/O these output to be Y1, Y2 or Z1, Z2 respectively. OUTPUT: 2kHz Z-axis LED-driving source with A/D/E/F version. "1" = VDD, "0" = floating High duty is about 60s. OSC OUT OSCR CLK/RTS DATA/RXD VSS R M L X1 X2 I Y1 Y2 Z1 I Z2 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 level voltage comparator. Mechanical mode: 13.2 k resistor pull low, Current comparator input. VSS VDD Negative power. Power line. Three step dynamic input impedance. If OSC OUT is not connected to LEDs, the dynamic input impedance will be off. Use current comparator to measure photo-couples "ON", or "OFF". O I I/O I/O -I I/O I/O The RC oscillation clock output. Or 3mA sink current output for X, Y photo emitters. Connect 50k 1% precise resistor for oscillation. Connect to 8024 auxiliary port CLK line in PS/2 mode or connect directly to RS232C RTS pin in serial mode. Auto-detect the operating port by this pin. Connect to 8024 auxiliary port DATA line in PS/2 mode or connect directly to RS232C RXD pin in serial mode. Negative power input. Three key-switches inputs. 200k resistor pull low. In Z-axis key mode, M key toggling can change the scrolling speed from low to high.
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X1, X2, Y1, Y2 INPUT IMPEDANCE
UNIT:K
SC84520
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
4.0
5.0
INPUT VOLTAGE
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
5 L H5 V5' 0
4 R H4 V4' M
3 V7' H3 V3' Z3
2 V6' H2 V2' Z2
1 H7 H1 V1' Z1
0 H6 H0 V0' 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.
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Field Name
Other ID Begin ID PnP Revision EISA ID Product ID Serial Number Class ID Driver ID User Name Check sum End PnP
SC84520
Field Data
4D, 5A, 40, 00,.00, 00 08 01, 24 25, 2D, 23 10, 10, 10, 11 3C 3C,2D, 2F, 35, 33, 25 3C, 30, 2E, 30, 10, 26, 10, 21 3C, 25, 2D, 23, 00, 33, 23, 32, 2F, 2C, 2C, 29, 2E, 27, 00, 33, 25, 32, 29, 21, 2C, 00, 2D, 2F, 35, 33, 25 21, 15 09
Length
<17 1 2 3 4 9 <34 <42 <42 2 1
Description
ID for legacy Begin PnP ID Version 1.00 EMC 0001 None provided Mouse Class PnP0F0A EMC SCROLLING SERIAL MOUSE 2 bytes check sum End PnP ID
2.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: (a) Send 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
c. Remote Mode:
Data is transmitted only in response to a Read Data command.
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d. Wrap Mode:
SC84520
Any byte of data sent by the system. Except hex EC(Reset wrap mode) or hex FF (Reset) is returned by SC84520.
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. c. Data report format:
Byte
1
Bit
0 1 2 3 4 5 6 7
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 X data ( D0 - D7) Y data ( D0 - D7)
2 3
0-7 0-7
C) PS/2 Mouse Data Transmission:
a. SC84520 generates the clocking signal when sending data to and receiving data from the system. b. The system requests SC84520 receive system data output by forcing the DATA line to an inactive level and allowing CLK line to go to an active level. c. Data transmission frame:
Bit
1 2-9 10 11 d. Data Output (data from SC84520 to system): If CLK is low (inhibit status), data is no transmission.
Function
Start bit (always 0) Data bits (D0 - D7) Parity bit (odd parity) Stop bit (always 1)
If CLK is high and DATA is low (request -to-send), data is update. Data is received from the system and no transmission are started by SC84520 until CLK and DATA both high. If CLK and DATA both are high, the transmission is ready. DATA is valid prior to the falling edge of CLK and beyond the rising edge of CLK. During transmission, SC84520 check for line contention by checking for an inactive level on CLK at intervals not to exceed 100s, Contention occurs when the system lowers CLK to inhibit SC84520 output after
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SC84520
SC84520 has started a transmission. If this occurs before the rising edge of the tenth clock, SC84520 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. e. Data Input (from system to SC84520): The system first check if SC84520 is transmitting data. If SC84520 is transmitting, the system can override the output forcing CLK to an inactive level prior to the tenth clock. If SC84520 transmission is beyond the tenth clock, the system receives the data. If SC84520 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 100s 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, SC84520 clocks 11 bits, Following the tenth clock SC84520 checks for an active level on the DATA line, and if found, force DATA low, and clock once more. If occurs framing error, SC84520 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 SC84520 to response before sending its next output.
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) is send to the system. c. The counter accumulators are cleared after receiving any command except "Resend" d. SC84520 receives a Resend command (FE), it transmit its last packet of data. e. In the stream mode "Resend" is received by SC84520 following a 3-byte data packet transmission to the system. SC84520 resend the 3-byte data packet prior to clearing the counter. f. A response is sent within 25ms if a) The system requires a response b) An error is detected in the transmission g. If SC84520 is in the stream mode: a) The system disables SC84520 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 SC84520. 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:
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Hex Code
FF FE F6 F5 F4 F3.XX F2 F0 EE EC EB EA E9 E8.XX E7 E6 The following describes valid commands: a. Reset (FF) SC84520 operation: a) Completion the reset. b) Transmitted FA, AA, 00 to the system. c) Set Default: Sampling rate: 100 reports/s Non-autospeed Stream mode 2 dots/count disable b. Resend (FE)
SC84520
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
SC84520 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
a) Any time SC84520 receives an invalid data. It returns a Resend command to the system. b) When SC84520 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 SC84520 immediately following a 3-byte data packet transmission to the system. c. Set Default (F6) The command reinitializes all conditions to the power-on defaults.
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d. Disable (F5) This command is used in the stream mode to stop transmissions from SC84520. e. Enable (F4) Begins transmissions, if in stream mode. f. Set Sampling Rate (F3, XX)
SC84520
In the stream mode, this command sets the sampling rate to the value indicated by byte hex XX. Shown in following:
Second byte XX
0A 14 28 3C 50 64 C9 g. Read Device Type (F2)
Sample Rate
10/sec 20/sec 40/sec 60/sec 80/sec 100/sec 200/sec
SC84520 always echoes "FA,00" following this command. h. Set Remote Mode (F0) Data value 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) SC84520 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. h. Set Stream Mode (EA) This command sets SC84520 in stream mode.
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l. Status Request (E9)
SC84520
Bit
0 1 2 3 4 5 6 7
When this command is issued by the system, SC84520 respond with a 3-byte status report as follows:
Byte
1
Description
1 = Right button pressed 1 = Middle button pressed 1 = Left button pressed Reserved 0 = Normal speed, 1 = Autospeed 0 = Disabled, 1 = Enable 0 = Stream mode, 1 = Remote mode Reserved Current resolution setting (D0 - D7) Current sampling rate (D0 - D7)
2 3 m. Set Resolution (E8, XX)
0-7 0-7
SC84520 provides four resolutions selected by the second byte of this command as follows:
Second Byte XX
00 01 02 03 n. Set Autospeed (E7)
Resolution
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
0 1 2 3 4 5 N( 6) o. Reset Autospeed (E6) This command restore normal speed.
Output
0 1 1 3 6 9 2.0*N
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3.MICROSOFT OPS/2 SCROLLING MOUSE MODE:
SC84520
A) Entering procedure: Except in WRAP mode, While SC84520 received the following consecutive command.
a. F3 C8 b. F3 64 c. F3 50 ---- set sampling rate 200/sec ---- set sampling rate 100/sec ---- set sampling rate 80/sec
B) Operating:
a. All of the command in legacy mode still be valid. b. The ID code of read device type command (F2) will changed from "00" to be "03". c. Data report will be four bytes format:
Byte
1
Bit
0 1 2 3 4 5 6 7
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 X data (D0 - D7) Y data (D0 - D7) Z data (D0 - D7)
2 3 4
0-7 0-7 0-7
C) Exiting Microsoft scrolling mode:
There are two ways to exit: a. Power off. b. Reset command (FF).
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4.Z-AXIS INPUT FUNTION:
SC84520
a. Photo couples input: Z-axis counter accumulates the Z1, Z2 phase changed by movement. 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 7. c. The relationship between the value and the transmission rate as follows:
Value
1 2 3 4 5 6 7
Rate per second
2.7 6.4 9.2 12.8 15 18 20
d. Voltage-sensing mode: There are 7 voltage levels in Z1, Z2 input. The transmission table is the same as keyswitch mode. The relationship between the value of Z-axis counter and the voltage as follows:
Value
0 1 2 3 4 5 6 7 Under VDD = 5V condition e. Mechanical mode: The same as optical wheel mode.
Voltage
1V 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
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TIMING DIAGRAM
(A) PS/2 mouse mode:
SC84520
(A) Photo-couples pulse width
X1(Y1)
X2(Y2) Tr Tf
(B) Receiving Data
Inhibit CLK
Tmca Tmci
1st CLK
2rd CLK
9th CLK
10th CLK
11th CLK
DATA
Tmdc
Start Bit
Bit0-Bit7
Parity Bit
Stop Bit
Line Control Bit
(C) Sending Data
1st CLK 2nd CLK 10th CLK 11th CLK
CLK
Tscl
Tsca Tpi
DATA
Tsdc
Tscd
Start Bit
Bit0-Bit7
Parity Bit
Stop Bit
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SC84520
(B) Serial mouse mode:
(A) RXD output
Key in/release
Mouse RXD
Tmx Tmx
(B) Byte structure
RXD
1st 2rd 3nd 4nd
(C) Bits structure
RXD LINE Data Bit no.
0123456 Ts Td Td Td Td Td Td Td Tp Tp
0
1
(D) PnP ID code echo timing
RTS
Trd
RXD
4D 5A 40 00 00 00 08 PnP ID code 09
"4D" code Bit no.
Ts
0
1
2
3
4
5
Tp Tp
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APPLICATIONS CIRCUITS
SC84520
1 RXD TXD DTR SG DSR RTS 2
5.1V DATA 1 2
1 5 6 7 2
50k *
VDD CLK/RTS DATA/RXD OPT OSC OUT
Y2 Y1 X2 X1 Z2 Z1
15 14 13 12 4 3 11 10 9
1k
0.1f
3 4 5 6
GND +5V CLK
3 4 5 6
7 8 9
10f
16
OSCR
L M
8 * 50k must be precise resistor under 1%.
VSS
R
SC84520A/E
1k 4 chips digital PT 2 chips digital PT
1 RXD TXD DTR SG DSR RTS 2
5.1V DATA 1 2
1 5 6 7 2
50k *
VDD CLK/RTS DATA/RXD OPT OSC OUT
Y2 Y1 X2 X1 Z2 Z1
15 14 13 12 4 3 11 10 9
0.1f 10f
3 4 5 6
GND +5V CLK
3 4 5 6
7 8 9
16
OSCR
L M
* 50k must be precise resistor under 1%.
8
VSS
R
SC84520B
1k 4 chips digital PT 2 chips digital PT
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APPLICATIONS CIRCUITS (continued)
SC84520
1 RXD TXD DTR SG DSR RTS 2
5.1V DATA 1 2
1 5 6 7 2
50k *
VDD CLK/RTS DATA/RXD OPT OSC OUT
Y2 Y1 X2 X1 Z2 Z1
15 14 13 12 4 3 11 10 9
0.1f 10f
3 4 5 6
GND +5V CLK
3 4 5 6
7 8 9
16
OSCR
L M
8 * 50k must be precise resistor under 1%.
VSS
R
SC84520C
1k 4 chips digital PT 2 chips digital PT
1 RXD TXD DTR SG DSR RTS 2
5.1V DATA 1 2
1 5 6 7 2
50k *
VDD CLK/RTS DATA/RXD OPT OSC OUT
Y2 Y1 X2 X1 Z2 Z1
15 14 13 12 4 3 11 10 9
A COM** B 0.1f 10f
3 4 5 6
GND +5V CLK
3 4 5 6
7 8 9
16
OSCR
L M
* 50k must be precise resistor under 1%. ** Mechanical wheel
8
VSS
R
SC84520D/F
1k 4 chips digital PT 2 chips digital PT
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PACKAGE OUTLINE
SC84520
UNIT:mm
2.54
DIP-16-300-2.54
6.40
1.50 19.4
7.62
15 degree
3.51
0.46
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3.30
5.08
0.25

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