EM83702 EM83702 ALL IN ONE MOUSE CONTROLLER ALL IN ONE MOUSE CONTROLLER Patent Number : 38715, 95661 (R.O.C) Patent Pending : 84200836 (R.O.C) GENERAL DESCRIPTION The EM83702 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 EM83702 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 650 mm/sec without missing a dot in microsoft mode,and the scanning speed can up to 770 mm/sec in mouse system mode. FEATURES • • • • • • • • • • • • • Built-in two zener diode between VDD and VSS, RTS and VDD. Buit-in noise immunity circuit. CMOS DIP 16 pins package & SOP 16 pins package. Low power dissipation. Use 32.768 kHz 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 13 ms. Through three key-switches input, EM83702 can exert seven different output. The sampling rate of motion detector is 65 KHz. APPLICATIONS • • • • • Optical mouse or pen-mouse Mechanical mouse or pen-mouse Optomechanical mouse or pen-mouse Mechanical track ball Optomechanical track ball * This specification are subject to be changed without notice. 4.15.1996 1 EM83702 ALL IN ONE MOUSE CONTROLLER PIN ASSIGNMENTS EM83702A RS MS OSC.IN OSC.OUT RTS RXD VSS R 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 EM83702B VDD OPT Y2 Y1 X2 X1 L M RS OPT MS OSC.IN OSC.OUT RTS RXD VSS 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VDD Y2 Y1 X2 X1 L M R FUNCTIONAL BLOCK DIAGRAM OPT X1 X2 Y1 Y2 L M R M O T I O N D E T E C T O R N O I S E I M M U N I T Y D E B O U N C E P/S MULTIPLEXER COUNTER TIMING CONTROLLER MODE SELECTOR MS RS OSC.OUT SYSTEM CLOCK GENERATOR LEVEL-SHIFT CIRCUIT RXD OSC.IN RTS PIN DESCRIPTIONS Symbol I/O RS I MS I OSC.IN OSC.OUT I RTS I Function Crystal type select : "0" or floating, select 32.768KHz crystal. "1" select 3.58MHz resonator. When this pin is connected to VDD, then EM83702 is assigned to operate under the microsoft mode only. If the pin is connected to VSS , then EM83702 will operate under the mouse system mode. However if this pin is "floating", then EM83702 is on the “power on initiation” situation and if any one of three buttons is chosen, thence EM83702 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. A built-in inverter provides oscillation with 32.768 KHz 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, EM83702 echoes the selected mode 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 EM83702. * This specification are subject to be changed without notice. 4.15.1996 2 EM83702 ALL IN ONE MOUSE CONTROLLER Symbol I/O RXD O VSS R M L I I/O I/O X1 X2 Y1 Y2 I OPT VDD I Function There are 8 or 7 bits in each data byte. Using parallel-in and serial-out components, the data bytes are shifted out from bit 0 through the high bits. EM83702 will transmit the data while the status of three keyswitches or the state of the horizontal counter or vertical counter is changed. Negative power input. Three key-switches exert seven different combinations totally. Both key-pressed and key-released signals will be sent accomplanied with horizontal and vertical state. The status of the key-switches will be preserved, whenever the value of horizontal or vertical counters will present at RXD. And the debounce interval for both key-press and key-release is 13 ms. In testing mode, L and M are the outputs of motion detecdor. Using R key can select 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. Four photo-couple signals denote UP, DOWN, LEFT and RIGHT state. If EM83702 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 maxiun. During the scaning period, as long as the photocouples 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. FUNCTION DESCRIPTIONS A) Operating Mode Mouse system mode Anytime the mouse changes its state, including the key-switches and the photo-couple sensors, EM83702 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 key-switches status. The second byte denote 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 ...... 7 6 5 4 3 2 1 0 1st byte...... 1 0 0 0 0 L’ M’ R’* 2nd byte...... H7 H6 H5 H4 H3 H2 H1 H0 3rd byte...... V7 V6 V5 V4 V3 V2 V1 V0 4th byte...... H7 H6 H5 H4 H3 H2 H1 H0 5th byte...... V7 V6 V5 V4 V3 V2 V1 V0 * ‘ denotes complement * This specification are subject to be changed without notice. 4.15.1996 3 EM83702 ALL IN ONE MOUSE CONTROLLER (B) Microsoft mode In microsoft mode, the transmission cycle consists of three bytes. Each byte is divided into one start bit, seven data bits and two stop bit. 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 transmited in 2’s complement. Output byte arrange: bit no ...... 6 5 4 3 2 1 0 1st byte...... 1 L R V7' V6' H7 H6 2nd byte...... 0 H5 H4 H3 H2 H1 H0 3rd byte...... 0 V5' V4' V3' V2' V1' V0' (C) Testing mode Whenever OPT is connected to VDD, the chip will enter buyer’s testing mode. The X direction output signals of comparators will present to L and M pin. Pressing “R” key can toggle the output from X direction to Y direction. (D) 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 EM83702 will send out two byte C8(H) code. * This specification are subject to be changed without notice. 4.15.1996 4 EM83702 ALL IN ONE MOUSE CONTROLLER ABSOLUTE MAXIMUM RATINGS Parameter Supply voltage Min. Max. VDD-VSS -0.3 7.0 RTS-VSS -0.3 0 -65 - Temperature under bias Storage temperature range Power dissipation Unit V 14 70 150 500 V °C °C mW DC ELECTRICAL CHARACTERISTICS ( TA= 25°C to 70 °C ) Parameter Sym. Operating voltage VDD - - 6.5 VRTS Iop Iop Iop Iop IRTS IRTS Irh 3 4 3 2.0 - 13 0.6 1.6 0.6 - V mA mA mA mA mA mA mA Irl - - -2.0 mA Vpl Vph Ipi 1.3 57 - 0.7 104 V V µA Vt+ VtVail Vaih Imi 9.6 3.5 18.6 - 6.8 1.5 56 V V V V µA Iil 0 - 1.0 µA Iih -1.0 - 0 µA 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, 3.58KHz, no load) Operating current (VDD=6.2V,RTS=VDD, 3.58KHz, no load) RTS operating current (V DD=5.6V,RTS=11V) RTS operating current (VDD=5.6V,RTS=11.8V) RXD high output voltage (Vrh=Vrts-2.6V) RXD low output voltage (Vrl=Vss+2.6V) X1,X2,Y1,Y2 low input voltage X1,X2,Y1,Y2 high input voltage X1,X2,Y1,Y2 input current ( pull low resistor Vds=1.0V ) 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) RS,OSC.IN,L,M,R,X1, X2,Y1,Y2,OPT input leakage current ( Vin = 0V ) RS,OSC.IN input leakage current ( Vin = 5.6V) Min. Typ. Max. Unit. V * All voltages in above table are compared with VSS. * All parameters in above table are tested under VDD=5.6V. * This specification are subject to be changed without notice. 4.15.1996 5 EM83702 ALL IN ONE MOUSE CONTROLLER X1,X2,Y1,Y2 INPUT IMPEDANCE R 17.0 K MAX. 16.0 K 15.0 K TYP. 14.0 K 13.0 K 12.0 K MIN. 11.0 K 10.0 K 9.0 K 8.0 K 7.0 K 6.0 K 5.0 K 4.0 K 3.0 K 2.0 K 1.0 K 0 10.0M 1.0 2.0 3.0 VOLTS (LIN) 4.0 5.0 AC ELECTRICAL CHARACTERISTICS (TA=0°C to 70°C) Parameters Key debounce Transmission time mouse (1200) Transmission time microsoft (1200) Start bit time (1200) Data bit time (1200) Stop bit time (1200) Mode code delay time (1200) Rising edge crossed width Falling edge crossed width Sym. Min. Typ. Tkd Tms Tmx Ts Td Tp Trd Tr Tf 11.9 15 15 13 41.1 24.7 0.85 0.82 0.82 - Max. 14 - Unit ms ms ms ms ms ms ms us us AC TIMING TEST POINT : Output: RXD pin VRTS-2.4V VSS+0.8V Input: X1, X2, Y1, Y2, pin 1.3V 0.7V 2VDD RTS pin VSS VDD Other pin * This specification are subject to be changed without notice. VSS 4.15.1996 6 EM83702 ALL IN ONE MOUSE CONTROLLER TIMING DIAGRAM (A) P/S output: Key in/release Mouse RXD Tms Tms Microsoft RXD Tmx Tmx (B) Bytes structure: Mouse RXD Microsoft RXD 1st 2nd 3rd 1st 2nd 3rd 4th 5th (C) Bits structure: (1) Mouse RXD LINE Data bit no. 0 Td Ts (2) Microsoft RXD LINE Data bit no. 0 Td Ts 1 Td 1 Td 2 Td 2 Td 3 Td 3 Td 4 Td 4 Td 5 Td 6 Td 7 Td 5 Td 6 Td Tp 4 5 6 0 1 Tp 0 1 Tp #(D) mode select timing: (1) Mouse system RTS Trd > <Trb RXD > < two byte "C8" code Reset code "C8" Bit no. Ts 0 1 2 3 7 Tp (2) Microsoft RTS Trd < > RXD > < "CD" code Reset code "CD" Bit no. Ts 0 1 2 * This specification are subject to be changed without notice. 3 4 5 6 7 Tp 4.15.1996 7 EM83702 ALL IN ONE MOUSE CONTROLLER #(E) Photo-couples pulse width X1 (Y1) X1(Y1) Tr Tf EM83702 I/O pin equivalent circuit: RS, R, M, L, OPT: OSC.IN, OSC.OUT: INTERNAL SYSTEM CLOCK (R,M,L,OPT) RSAUT (R,M,L,OPT) INTERNAL SIGNAL OSC.IN L, M, R, MS: OSC.OUT RTS, RXD: RTS RTS TEST MODE ENABLE X1(Y1) PHASE DIGITAL SIGNAL VDD VDD D RXD RXD R R X2(Y2) PHASE DIGITAL SIGNAL L M R R R Q CLK POWER ON RESET VCC RXD CONTROL SIGNAL RXD CONTROL SIGNAL MODE SELECTION MS RTS INTERNAL SIGNAL RTS INTERNAL SIGNAL X1, X2, Y1, Y2: VCC + X1(X2,Y1,Y2) PHASE DIGITAL SIGNAL 4.5R R * This specification are subject to be changed without notice. 4.15.1996 8 EM83702 ALL IN ONE MOUSE CONTROLLER APPLICATION CIRCUIT L M 9 10 11 R 8 VSS 7 RXD 6 5 RTS EM83702A X2 X1 12 13 Y1 OSC.OUT 4 * This specification are subject to be changed without notice. TXD RXD RTS 32768 Hz (3.58MHz) 14 Y2 OSC.IN 3 15 OPT MS 2 1 RS VDD 16 10µF X Y GND Mechanical Mouse 4.15.1996 9 EM83702 ALL IN ONE MOUSE CONTROLLER 9 L M 10 11 R 8 VSS 7 RXD 6 5 RTS EM83702A X2 X1 12 13 Y1 OSC.OUT 4 * This specification are subject to be changed without notice. TXD RXD RTS 32768 Hz (3.58MHz) 14 Y2 OSC.IN 3 15 OPT MS 2 1 RS VDD 16 R 10µF SG Optomechanical Mouse 4.15.1996 10 EM83702 ALL IN ONE MOUSE CONTROLLER M L 10 11 12 R 9 VSS 8 7 6 RTS RXD EM83702B X2 X1 13 14 Y1 TXD RTS * This specification are subject to be changed without notice. RXD OSC.OUT 5 OSC.IN 4 32768 Hz (3.58MHz) 15 Y2 2 OPT MS 3 1 RS VDD 16 R 10µF SG Optomechanical Mouse 4.15.1996 11