Silan Semiconductors SC7461 INFRARED REMOTE CONTROL TRANSMITTER DESCRIPTION The SC7461 is a remote control transmitter utilizing CMOS Technology specially designed for infrared applications. It is capable of controlling 32 function keys and 3 double keys. SC7461 is housed in 24 pins, SO Package and provides 13 bits Custom Code. FEATURES * CMOS Technology * Low Power Consumption SOP-24 * 32+3 Function Keys * Least External Components * Wide range of operating voltage: VDD=2.0~5.5V ORDERING INFORMATION * Double key operation(No order of priority given) * On-Chip Oscillator can be constructed using an externally connected ceramic resonator * Up to 64 Custom Codes may be selected externally for SC7461 APPLICATIONS Part No. Package SC7461 SOP-24-375-1.27 * Audio Cassette Deck * TV and VCR * Air Conditioner * Audio Equipment * Multi-Media DVD Player ORDERING INFORMATION Valid Part Number Package Custom Code in Mask ROM SC7461-100 SOP-24 C6~C12=1000000 SC7461-101 SOP-24 C6~C12=0000000 SC7461-103 SOP-24 C6~C12=0010000 SC7461-104 SOP-24 C6~C12=1010000 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.2 1 2002-02-28. Silan Semiconductors SC7461 PIN CONFIGURATION KI0 1 24 C3 KI1 2 23 C2 KI2 3 22 C1 KI3 4 21 C0 C4 5 20 KO0 C5 6 19 KO1 OUT 7 18 KO2 VDD 8 17 KO3 TEST 9 16 KO4 OSCI 10 15 KO5 OSCO 11 14 KO6 12 13 KO7 Vss SC7461 BLOCK DIAGRAM KI0 1 KI1 2 KI2 3 OSCI OSCO VDD VSS 10 11 8 12 Output Circuit OSC Circuit KI3 Key Input Scan Circuit 4 Timing Generation &Control Circuit Custom Code Register Code Generation Circuit Key Output Timing Signal Generator 9 20 19 18 17 16 14 14 13 TEST KO0 KO1 KO2 KO3 KO4 KO5 KO6 KO7 7 OUT 21 C0 22 C1 23 C2 24 C3 5 C4 6 C5 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.2 2 2002-02-28. Silan Semiconductors SC7461 ABSOLUTE MAXIMUM RATING (Tamb=25°C, unless otherwise specified) Characteristic Symbol Description Value Unit Maximum Supply Voltage VDD(max) VDD Vss-0.3~10 V V Input Voltage VIN Each Input pin Vss-0.3~VDD+0.3 Output Voltage VOUT -- Vss-0.3~VDD+0.3 V Output Current IOUT OUT -35 mA Pd(max) Ta<=85°C 150 mW Storage Temperature Tstg -- -40~+125 °C Operating Temperature Topr -- -10~+70 °C Allowable Power Dissipation ELECTRICAL CHARACTERISTICS (Tamb=25°C, VDD=3.0V,unless otherwise specified) Parameter Symbol Test conditions Min Typ Max Unit Operating Supply Current IDD Key ON, Output: no load 1 mA Quiescent Supply Current IDS All keys OFF, OSC stops 1 µA IOH1 VDD=1.8V, VOH=1.0V -8 mA IOH2 VDD=3.0V, VOH=2.0V -25 mA High Level Output Voltage VOH IOH=1mA Low Level Output Voltage VOL IOL=1mA High Level Output Current 2.4 V 0.2 V IOFF -- 1 µA Custom Code High Level Input Current IIH VIN= VDD 1 µA Custom Code Low Level Input Current IIL VIN= VSS Input Floating Voltage VIF -- Input Pull-Down Resistance RIN -- Output OFF-State Leakage Current µA -1 0.1VDD 75 100 V kΩ 125 RECOMMENDED OPERATING CONDITIONS (Tamb=25°C, fosc=455kHz,unless otherwise specified) Characteristic Symbol Min. Typ. 3.0 Supply Voltage VDD 2.0 High Level Input Voltage VIH 0.7VDD Low Level Input Voltage VIL Vss Oscillation Frequency fosc 400 455 Max. Unit 3.3 V VDD V 0.3VDD V 500 KHz HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.2 3 2002-02-28. Silan Semiconductors SC7461 PIN DESCRIPTION Pin No. Symbol I/O 1~4 KI0~KI3 I Key Input Pins 7 OUT O Output Pins For Transit LED Drive 8 VDD -- Power Supply 9 TEST I LSI Test Pin. This pin is normally set to High State or Floating. 10 OSCI I Oscillator Input Pin 11 OSCO O Oscillator Output Pin 12 VSS -- Power Supply Vss=GND 13~20 KO7~KO0 O Key Scan Timing Signal Output Pins 21~24 C0~C3 5,6 C4~C5 I Description Custom Code Input Pins. Capable of externally setting 6 out of 13 bits for custom coding. FUNCTIONAL DESCRIPTION 1.OSCILLATION CIRCUIT A self-biased type amplifier is housed by a CMOS Inverter Method. Thus, an oscillation circuit can be constructed by connecting a ceramic resonator. Please refer to Figure 4 for the oscillation circuit diagram. VDD SC7461 100pF 455KHz 100pF FIGURE 1. OSCILLATION CIRCUIT DIAGRAM Unless the keys are being operated, the oscillation is normally stopped. Thus, power consumption is considerably reduced. 2.KEY INPUT A total of 32 keys can be connected by Key Inputs--KI0~KI3 and Timing Signals--KO0~KO7. Double Key Operation is possible for only Key No.20 in combination with the other keys connected to the KO5 line, namely: Key No.21, 22 or 23. Thus, only the following key combinations may be used for the double key operation: 1).Key Nos.20 and 21 2).Key Nos.20 and 22 3).Key Nos.20 and 23 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.2 4 2002-02-28. Silan Semiconductors SC7461 There is no order of priority given in key input. This means that keys designated for the double keying operation may be pressed in any sequence. When two keys (designated for the double key operation) are pressed simultaneously, a series of pulse is outputted according to each key input. Pressing other keys that are NOT intended for the double key operation do NOT generate any output. The Key Matrix is given in the following diagram. KO0 KO1 KO2 KO3 KO4 KO5 KO6 KO7 0 4 8 12 16 20 24 28 KI0 1 5 9 13 17 21 25 29 KI1 2 6 10 14 18 22 26 30 KI2 3 7 11 15 19 23 27 31 KI3 FIGURE 2. KEY MATRIX 3.DOUBLE KEY OPERATION Double Key Operation is useful for tape deck recording operation. The following table shows the Key Data corresponding to the double keys pressed. Also refer to the Key Input Section. Key D0 D1 D2 D3 D4 D5 D6 D7 K20+K21 1 0 1 0 1 1 0 0 K20+K22 0 1 1 0 1 1 0 0 K20+K23 1 1 1 0 1 1 0 0 NOTE: Key Data--D6 and D7 may be preset to "0", "1" by mask option. Key 20 (H=Key-ON) Key 21 Key 22 Key 20&21 Key 21 Key 22 Key 20&22 Key 20 Transmission Transmission Transmission Transmission Transmission Transmission Stops Data Data Data Data Data FIGURE 3. TRANSMISSION DATA DIAGRAM HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.2 5 2002-02-28. Silan Semiconductors SC7461 When any of the double key combinations (Key No.20&21, Key No.20&22 and Key No.20&23) are pressed: 1).D5 is set to "1" 2).No Key Input Sequence is needed to perform the Double Key Operation 4.SC7461 DATA FRAME A SC7461 Data Frame consists of 42 bits, namely: 13 bits Custom Code (C0~C12), 8 bits Key Data (D0~D7), and their respective Inverse Codes. Please refer to the figure below. C0 C1 C2 C3 C4 C5 C6 C8 C9 C10 C11 C12 C0 C1 C2 C3 C4 C5 C6 C7 C8 C10 C11 C12 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 Custom Code (13 bits) Custom Code (13 bits) Key Data (8 bits) Key Data ( 8 bits) FIGURE 4. SC7461 DATA FRAME CUSTOM CODE The Custom Code consists of 13 bits, namely: C0~C12. 7 bits--C6~C12-- are fixed by the on-chip ROM while 6 bits--C0~C5--are pin-settable. SC7461 provides up to 64 custom codes that may be selected externally without any diode requirement. Please refer to the illustration below. C0 C1 C2 C3 C4 C5 C6 C8 C9 C10 C11 C12 Pin-Settable 6 Bits Mask ROM 7 Bits FIGURE 5. SC7461 CUSTOM CODE For example: Given the following setting, SC7461 VC5 6 C4 5 C3 24 C2 23 C1 22 C0 21 FIGURE 6. EXAMPLE CUSTOM CODE SETTING then, the Custom Codes C0~C5 will have the following values:C0=0, C1=1, C2=1, C3=0, C4=0, C5=1. HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.2 6 2002-02-28. Silan Semiconductors SC7461 KEY DATA The Key Data has 8 bits (D0~D7) and has the following Key Data Codes. D6 and D7 may be preset to "0", "1". Key D0 D1 D2 D3 D4 D5 D6 D7 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 2 0 1 0 0 0 0 0 0 3 1 1 0 0 0 0 0 0 4 0 0 1 0 0 0 0 0 5 1 0 1 0 0 0 0 0 6 0 1 1 0 0 0 0 0 7 1 1 1 0 0 0 0 0 8 0 0 0 1 0 0 0 0 9 1 0 0 1 0 0 0 0 10 0 1 0 1 0 0 0 0 11 1 1 0 1 0 0 0 0 12 0 0 1 1 0 0 0 0 13 1 0 1 1 0 0 0 0 14 0 1 1 1 0 0 0 0 15 1 1 1 1 0 0 0 0 16 0 0 0 0 1 0 0 0 17 1 0 0 0 1 0 0 0 18 0 1 0 0 1 0 0 0 19 1 1 0 0 1 0 0 0 20 0 0 1 0 1 0 0 0 21 1 0 1 0 1 0 0 0 22 0 1 1 0 1 0 0 0 23 1 1 1 0 1 0 0 0 24 0 0 0 1 1 0 0 0 25 1 0 0 1 1 0 0 0 26 0 1 0 1 1 0 0 0 27 1 1 0 1 1 0 0 0 28 0 0 1 1 1 0 0 0 29 1 0 1 1 1 0 0 0 30 0 1 1 1 1 0 0 0 31 1 1 1 1 1 0 0 0 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.2 7 2002-02-28. Silan Semiconductors SC7461 5.SC7461 TRANSMISSION CODE The SC7461 transmission code consists of a leader code, 13 bits custom code, and 8 bits key data codes. The inverse code of both the custom and key data codes are also sent simultaneously; thus, allowing an extremely low error rate in the system configuration. Please refer to the following diagram. C0 C1 C2 C3 C4 C5 C6 C8 C9 C10 C11 C12 C0 C1 C2 C3 C4 C5 C6 C7 C8 C10 C11 C12 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 Leader Code Custom Code (13 bits) Custom Code (13 bits) Key Data (8 bits) Key Data ( 8 bits) FIGURE 13. REM OUTPUT CODES The leader code consists of a 9ms carrier waveform followed by a 4.5ms OFF waveform. It is used as the leader for the following codes (Custom, Data and their respective inverse codes). Thus, when the reception is configured by a microcomputer, the time relationship between the reception detection and other processes can be managed efficiently. The code uses the PPM (Pulse Position Modulation) Method, with "1" and "0" differentiated by the time between pulses. HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.2 8 2002-02-28. Silan Semiconductors SC7461 6.SC7461 TRANSMISSION WAVEFORM The SC7461 Transmission Waveform illustrated below were derived from the time period for fosc=455KHz. 84.4ms 108ms 108ms Go To Second Transmission Go To Second Transmission and Onwards 9ms Custom Code 13bits 4.5ms Custom Code 13 bits Key Data 8bits Key Data 8bits 13.5ms 43.9ms Leader Code 27ms 84.4ms First Transmission 0.56ms 9ms 4.5ms 13.5ms 0 1 0 1 0 1 1 2.25ms 1.125ms Second Transmission Onwards (Transmission is available only when key input contimues) 4.5ms 9ms 0.56ms 13.5ms Carrier Waveform 8.77µs Carrier Frequency=1/12 fosc=38KHz 26.3µs FIGURE 8. SC7461 TRANSMISSION WAVEFORM HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.2 9 2002-02-28. Silan Semiconductors SC7461 TYPICAL APPLICATION CIRCUITS VDD VDD VDD 100pF 100pF 455KHz C4 C3 C2 C1 SC7461 IR LED 21 C0 C5 OUT 7 Vss 12 270 ¡ KO2 KO1 KO0 1 KO3 KI0 22 VDD 1 23 KO4 KI1 24 TEST 2 5 KO5 KI2 6 OSCI 3 8 KO6 KI3 9 KO7 4 10 OSCO VDD 11 13 14 15 16 17 18 19 20 ¡ C0=0 C1=1 C2=0 C3=1 C4=0 C5=1 VDD 47 F 0.1 F Note:1. Two capacitance connect with VDD should as near as possible. 2. The line between two capacitance and VDD and ground should as short as possible. FIGURE 9. SC7461 APPLICATION CIRCUIT DIAGRAM CHIP TOPOGRAPHY 20 19 18 17 16 15 14 21 13 22 23 12 24 11 1 10 2 3 4 5 6 7 8 Size: 1.84 x 1.46 mm 9 2 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.2 10 2002-02-28. Silan Semiconductors SC7461 PAD COORDINATES (Unit: µm) No. Symbol X Y No. Symbol X Y 1 2 3 4 5 6 7 8 9 10 11 12 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 -717.3 -762.3 -592.3 -416.9 -246.9 -76.9 98.1 496.6 721.6 721.6 721.6 721.6 -273.5 -532.3 -532.3 -532.3 -532.3 -532.3 -532.3 -532.3 -569.3 -399.3 -223.9 -53.9 13 14 15 16 17 18 19 20 21 22 23 24 P13 P14 P15 P16 P17 P18 P19 P20 P21 P22 P23 P24 721.6 721.6 444.0 274.0 89.8 -80.2 -264.4 -434.4 -717.3 -717.3 -717.3 717.3 291.1 475.3 532.2 532.2 532.2 532.2 532.2 532.2 407.0 237.0 67.0 -103.0 Note: The original point of the coordinate is the die center. HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.2 11 2002-02-28. Silan Semiconductors SC7461 PCB WIRE LAYOUT SCHEMATIC: Transmitting tube output ground line The transmitting tube ground line and IC ground line should layout separated or overstriking ground line. The above IC only use to hint, not to specified. Note: * In wire layout, the power filter capacitor should near to IC. * In wire layout, should avoid power line and ground line too long. * Recommended infrared transmit unit and IC ground line should layout separated, or overstriking lines. * The emitter of triode connect 1 resistor at least. * Recommended triode use 9014. HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.2 12 2002-02-28. Silan Semiconductors SC7461 PACKAGE OUTLINE Unit: mm 9.525(375) 0.3 SOP-24-375-1.27 0.4 10.2 7.6 B B 0.25 1.27 B0.25 0.40 15.34 B0.1 B0.05 3.10MAX 13.97 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.2 13 2002-02-28. Silan Semiconductors SC7461 Attach Revision History Data REV 2000.12.31 2.0 2001.12.12 2.1 2002.02.28 2.2 Description Page Change name of company in page footer Add the “Ordering information” 1 Modify the “Features “ 1 Modify the “Absolute maximum rating” and “Recommended operating 3 conditions” Modify the “Figure 6. example custom code setting” 6 Modify “Typical application circuit” 10 Add the “PCB wire layout schematic” 12 Modify the “Package outline” 13 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.2 14 2002-02-28.