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Silan Semiconductors
ALL IN ONE MOUSE CONTROLLER
DESCRIPTION
The SC83702 Mouse Controller is specially designed to control mouse device. This single chip can interface three key-switches and four photo-couple direct to RS-232C. The SC83702 does not need any external power supply, so the mouse can go without a power line. It is versatile with both microsoft and mouse system. Debouncing circuit were provided to prevent false entry and to improve the accuracy. In 1200 baud rate non-auto speed with 200 DPI wheels and photo-couples, the scanning is 650mm/sec without missing a dot in microsoft mode, and the scanning speed can up to 770mm/sec in mouse system mode.
SC83702
SOP-16
DIP-16
FEATURES
*Built-in two zener diode between VDD and VSS, RTS and VDD *Built-in noise immunity circuit *CMOS DIP 16 pins package&SOP 16 pins package *Low power dissipation *Use 32.768KHz crystal or 3.58MHz resonator *Oscillator circuits on-chip *Serial output in 1200 baud rate *Can be powered directly from RS-232C *Can drive directly to RS-232C *Three key-switches and four photo-couples inputs *Both key-in and key-release debounce interval 13ms *Through three key-switches input, SC83702 can exert seven different output *The sampling rate of motion detector is 65KHz
APPLICATIONS
*Optical mouse or pen-mouse *Mechanical mouse or pen-mouse *Optomechanical mouse or pen-mouse *Mechanical track ball *Optomechanical track ball
PIN CONFIGURATIONS
RS MS OSCI OSCO RTS RXD VSS R
1 2 3 4 5 6 7 8
SC83702A
16 15 14 13 12 11 10 9
VDD OPT Y2 Y1 X2 X1 L M
RS OPT MS OSCI OSCO RTS RXD VSS
1 2 3 4 5 6 7 8
SC83702B
16 15 14 13 12 11 10 9
VDD Y2 Y1 X2 X1 L M R
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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Silan Semiconductors
BLOCK DIAGRAM
VDD Vss
SC83702
16 8
OPT X1 X2 Y1 Y2 L M R MS RS OSCO OSCI RTS
2 12 13 14 15 11 10 9 3 1 5 14 6
SYSTEM CLOCK GENERATOR LEVEL SHIFT CIRCUIT DEBOUNCE MODE SELECTOR TIMING CONTROLLER MOTION DETECTOR NOISE IMMUNITY MULTIPLEXER P/S
7
RXD
NOTE: The pin numbers refer to SC83702B.
ABSOLUTE MAXIMUM RATINGS (Tamb=25C, unless otherwise specified)
Characteristic
Supply Voltage Temperature Under Bias Storage Temperature Power Dissipation VDD- Vss RTS-Vss
Value
-0.3~+7.0 -0.3~+14 0~70 -65~+150 600
Unit
V V C C mW
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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DC ELECTRICAL CHARACTERISTICS (Tamb=25~70C, VDD=5.6V)
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 (Pull Low Resistor, Vds=5.6V) (Pull Low Resistor, Vds=1.0V)
SC83702
Symbol
VDD VRTS 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 13 0.6 -1.6 -0.6 ---2.0 0.7 -104 -6.8 1.5 -56 1.0 0
Unit
V V mA mA mA mA mA mA mA mA V V A V V V V A A A
Rs,Osc-In,L,M,R,X1,X2,Y2,Y2,Opt Input Leakage Current RS, OSC-IN Input Leakage Current (Vin=0V) (Vin=5.6V)
NOTE: *All voltages in above table are compared with VSS. *All parameters in above table are tested under VDD=5.6V
AC ELECTRICAL CHARACTERISTICS (Tamb=25~70C)
Parameter
Key debounce Transmission time Transmission time Start bit time Data bit time Stop bit time Mode code delay time Rising edge crossed width Falling edge crossed width mouse(1200) microsoft(1200) (1200) (1200) (1200) (1200)
Symbol
Tkd Tms Tmx Ts Td Tp Trd Tr Tf
Min
------11.9 15 15
Typ
13 41.1 24.7 0.85 0.82 0.82 ----
Max
------14 ---
Unit
ms ms ms ms ms ms ms s s
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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AC TIMING TEST POINT
OUTPUT: RXD pin
VRTS-2.4V Vss+0.8V
SC83702
INPUT:X1,X2,Y1,Y2 pins
1.3V 0.7V 2VDD Vss VDD Vss
RTS pin
Other pins
X1,X2,Y1,Y2 INPUT IMPEDANCE
UNIT:K
17.0 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 1.0 2.0 3.0 4.0 5.0 MIN. TYP. MAX.
INPUT VOLTAGE
PIN DESCRIPTION
Pin Name
RS
I/O
I resonator.
Description
Crystal type select: "0" or floating. select 32.768KHz crystal. "1" select 3.58MHz
There are 8 or 7 bits in each data byte. RXD O Using parallel-in and serial-out components, the data bytes are shifted out from bit 0 through the high bits. SC83702 will transmit the data while the status of three key switches or the state of the horizontal counter or vertical counter is changed. (to be continued)
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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Silan Semiconductors
(continued)
SC83702
Description
Pin Name
I/O
When this pin is connected to VDD, then SC83702 is assigned to operate under the microsoft mode only. If the pin is connected to Vss, then SC83702 will operate under the mouse system mode. MS I However if this pin is "floating", then SC83702 is on the "power on initiation" situation and if any one of three buttons is chosen, then SC83702 will operate under the mouse mode. And while the whole system is on "power on initiation", no key is chosen then operation will be under microsoft mode. OSC.IN OSC.OUT I O A built-in inverter provides oscillation with 32.768KHz crystal or 3.58MHz resonator. Several counters used to decrease the frequency of oscillation and create 1200 baud rate, key-switches debounce and photo-couple sensor scanning clock, etc. Positive power input. The signal is sent by mouse driver from computer to the mouse to select a mode. During the reset time, SC83702 echoes the selected mode RTS I to the RXD line after the reset pulse signal of the RTS line. RXD will send out CD (H) code if it is under the microsoft mode. RXD will send out two-byte C8 (H) code if it is under the mouse system mode in SC83702. VSS R -I Negative power input. Three key-switches exert seven different combinations totally. Both key-pressed and key-released signals will be sent accompanied with horizontal and vertical state. The status of the key-switches will be preserved, whenever the M I/O value of horizontal or vertical counters will present at RXD. And the debounce interval for both key-press and key-release is 13ms. In testing mode, L and M are the outputs of motion detector. Using R key can select L I/O the two outputs X1, X2 or Y1, Y2. This feature can help manufacturer to adjust the phase of four photo-couples for improving the yield. X1 X2 I Y1 Y2 OPT VDD I -Four photo-couple signals denote UP, DOWN, LEFT and RIGHT state. If SC83702 is in 1200 baud rate on non-auto speed mode, the system provides 40 transmission cycles per second in microsoft mode to the utmost. In mouse system mode, the cycles are 24 maximum. During the scanning period, as long as the photo couples change their states, the value of vertical or horizontal counter will increase or decrease accordingly. Whenever OPT is connected to VDD, the chip will enter testing mode. Power
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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FUNCTION DESCRIPTIONS
1.OPERATING MODE A) Mouse System Mode
SC83702
Anytime the mouse changes its state, including the key-switches and the photo-couple sensors, SC83702 will detect the result and transmit to RS-232C. Mouse system transmits the result with five bytes in 1200 baud rate. Each byte contains 10 bits, one start bit, one stop bit and eight data bits. The first byte represents the keyswitches status. The second byte denotes the number counted by the horizontal counter. The third byte conveys the number accumulated by the vertical counter. If the mouse is moved faster, the photo-couple sensors detect the "change state" and output the record, excessive horizontal counter will be transported through the fourth byte and vertical counter through the fifth byte. Otherwise, the fourth and fifth byte are zero. Output bytes arrange:
Bit No. 1st Byte 2nd Byte 3rd Byte 4th Byte 5th Byte B) Microsoft Mode
7 1 H7 V7 H7 V7
6 0 H6 V6 H6 V6
5 0 H5 V5 H5 V5
4 0 H4 V4 H4 V4
3 0 H3 V3 H3 V3
2 L'* H2 V2 H2 V2
1 M'* H1 V1 H1 V1
0 R'* H0 V0 H0 V0
*: " ' " denotes complement
In microsoft mode, the transmission cycle consists of three bytes. Each byte is divided into one start bit, seven data bits and two stop bits. The first byte contains "L", "R" switch status and four bits of the two most significant bits in horizontal counter and vertical counter. The next byte represents the value accumulated by horizontal counter, the last byte is the data of the vertical counter. Notice that "M" key-switch is not active in the microsoft mode and the vertical data is transmitted in 2's complement.
Bit No. 1st Byte 2nd Byte 3rd Byte 2.TESTING MODE
6 1 0 0
5 L H5 V5'
4 R H4 V4'
3 V7' H3 V3'
2 V6' H2 V2'
1 H7 H1 V1'
0 H6 H0 V0'
Whenever OPT is connected to VDD, the chip will enter buyer's testing mode. The X direction output signal generators will present to L and M pin. Pressing "R" key can toggle the output from X direction to "Y" direction.
3.ECHO MODE
RXD will send out CD (H) code when RTS rise from low to high under microsoft mode. Under mouse system mode, when RTS rise from low to high, the RXD pin SC83702 will send out two byte C8 (H) code.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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Silan Semiconductors
TIMING DIAGRAM
(A) P/S Output
Key in/release
SC83702
Mouse RXD
Tms Tms
Microsoft RXD
Tmx Tmx
(B) Bytes Structure
Mouse RXD
1st 2nd 3rd 4th 5th
Microsoft RXD
1st 2nd 3rd
(C) Bits Structure
(1) Mouse
RXD LINE Data bit no.
Ts 0 Td 1 Td 2 Td 3 Td 4 Td 5 Td 6 Td 7 Td 0 Tp 1
(2) Microsoft
RXD LINE Data bit no.
Ts 0 Td 1 Td 2 Td 3 Td 4 Td 5 Td 6 Td 0 Tp Tp 1
(D) Mode Select Timing
(1) Mouse system
RTS
Trd
RXD Reset code "C8" Bit no.
two byte "C8" code
Ts
0
1
2
3
4
5
6
7
Tp
(2) Microsoft
RTS
Trd
RXD
"CD" code
Reset code "CD" Bit no.
Ts 0 1 2 3 4 5 6 7 Tp
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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Silan Semiconductors
(E) Photo-couples pulse width
X1(Y1)
SC83702
X2(Y2)
Tr Tf
SC83702 I/O PIN EQUIVALENT CIRCUIT
RS,R,M,L,OPT
RS(R,M,L,OPT) INTERNAL SIGNAL
OSC-IN
OSCI,OSCO
INTERNAL SYSTEM CLOCK OSC-OUT
L,M,R,MS
TEST MODE ENABLE X1(Y1) PHASE DIGITAL SIGNAL
RTS,RXD
RTS
X2(Y2) PHASE DIGITAL SIGNAL
L M R
RXD VDD
D CLK
Q
POWER ON RESET
RXD CONTROL SIGNAL
VCC
RTS INTERNAL SIGNAL
MS MODE SELECTION
X1,X2,Y1,Y2
VCC X1(X2,Y1,Y2)
+
PHASE DIGITAL SIGNAL
R
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
8
Silan Semiconductors
OPTOMECHANICAL MOUSE APPLICATIONS
SC83702
1 2 3
32768Hz (3.58MHz)
RS MS OSCI OSCO RTS RXD VSS R
VDD OPT
16 15 14 13
R
SG
SC83702A
Y2 Y1 X2 X1 L M
4 5 6 7 8
10F
RTS RXD TXD
12 11 10 9
1 3 4
32768Hz (3.58MHz)
RS MS OSCI OSCO RTS RXD VSS R
VDD OPT
16 2 15 14
R
SG
SC83702B
Y2 Y1 X2 X1 L M
5 6 7 8 9
10F
RTS RXD TXD
13 12 11 10
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
9
Silan Semiconductors
PACKAGE OUTLINE
SC83702
UNIT:mm
2.54
DIP-16-300-2.54
6.40
1.50 19.4
7.62
15 degree
3.51
0.46
SOP-16-225-1.27
0.41
3.30
5.08
0.25
UNIT:mm
1.27 10.20 9.80
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
10
1.95
6.00
3.95
5.72

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