SC50462 INFRARED REMOTE CONTROL TRANSMITTER OF 50462 CODE FORMAT DESCRIPTION The SC50462 is a remote control transmitter utilizing CMOS technology specially designed for use on infrared applications. It has 64 functions and a total of 76 commands can be transmitted. Housed in 24 pins DIP package, SC50462 has 2 address bits. FEATURES * High performance CMOS technology * Low power consumption * Least external components. * Up to 76 instructions * Double key operation is possible. ORDERING INFORMATION APPLICATIONS Device * Television remote control transmitter * Video cassette recorder(VCR) remote control transmitter Package SC50462 SDIP-24-300-2.54 SC50462S SOP-24-375-1.27 Key encoder BLOCK DIAGRAM HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.2 2005.12.15 Page 1 of 12 SC50462 ABSOLUTE MAXIMUM RATINGS(Tamb=25°C) Characteristic Symbol Ratings Unit Supply Voltage VCC -0.3 ~ 5.5 V Input Voltage VIN Vss-0.3V ~ VCC+0.3V V Vss ~ VCC V Output Voltage VOUT Power Dissipation PD 300 mW Operating Temperature Topr -10 ~ +70 °C Storage Temperature Tstg -40 ~ +125 °C ELECTRICAL CHARACTERISTICS(Tamb=25°C,VCC=3.0V,Vss=0,Unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 1.8 3 5 V 0.3 mA 1 µA Operating Supply Voltage VCC Tamb=20 ~ 70°C Operating Supply Current ICC1 fosc=455kHz Stand-by Current ICC2 High level Output Current( OUT ) IOH VOH=2V 5 mA Low level Output Current( OUT ) IOL VOL=1V -3 mA High level Output Current( CNTR ) IOH VOH=2V 1 mA Low level Output Current( CNTR ) IOL VOL=1V -3 mA PIN CONFIGURATION 1 24 Vcc OSCI 2 23 OUT OSCO 3 22 C5 CNTR 4 21 C4 I1 5 20 S8 I2 6 I3 7 I4 8 17 S5 I5 9 16 S4 I6 10 15 S3 I7 11 14 S2 I8 12 13 S1 SC50462 Vss HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn 19 S7 18 S6 REV:2.2 2005.12.15 Page 2 of 12 SC50462 PIN DESCRIPTION Pin No. Pin Name 1,24 VSS, VCC Description 2,3 OSCI,OSCO 4 CNTR Transmitting Indicator. An LED and resistor are connected from this pin to Vcc. 5~12 I1~I8 Key Scan Signal Input pins. Power Supply: VCC=3.0V,VSS=0V Oscillator Input/Output Pin, 455 or 480kHz Crystal is connected between these pins. 13~20 S1~S8 Key Scan Signal Output pins. 21,22 C4 , C5 Custom Code 23 OUT Modulation Pin FUNCTIONAL DESCRIPTION SC50462 is a sending signal IC on infrared remote control. Consisting of timing generating circuit, scan signal generating circuit, key input encoder, instruction decoder, custom code circuit, code encoder, and output buffer. It has 8*8 key matrix input and custom code with 16 bit PCM which shows 76 instructions.76Instruction are devided in 64 one shot signal and 12 2-shot signal. When Input Signal(I1~I8) and/or in combination with the Scan Signals(S1~S8) are activated, SC50462 checks the ID and the Custom Code Bits-- C4 and C5 --setting before finally sending out the remote control signal. 1. CNTR OUTPUT The CNTR Pin is the LED transmission Indicator. This means that Whenever a valid transmission is sent, the LED lights up. The CNTR output becomes “L”in the 7th pulse-rising and “H”in the 17th pulse-rising. Note: Oscillator Frequency=480 or 455kHz 2. OSCILLATING CIRCUIT An oscillator circuit may be constructed by using a 480kHz or 455kHz Crystal Resonator and two capacitors. Please refer to the following diagram. The carrier frequency transmitted is 40kHz or 37.9kHz.Unless any legal key input is activated, the oscillation is automatically stopped. Thus ,power consumption is considerably reduced. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.2 2005.12.15 Page 3 of 12 SC50462 3. KEY INPUT A total of 64 keys may be connected by Input Pins(I1~I8) and Output Pins(S1~S8) to form an 8x8 Key Matrix. Double key operation is possible for only one of the keys— SW25~SW28 in combination with any one of the keys –SW11~SW13. Any other key combination are regards as illegal and will not generate any activity. Thus, only the following key combinations may be used for the doubled key operation: I8 I7 I6 I5 I4 I3 I2 I1 Note: SW11 S1 S2 S3 SW12 SC50462 permits two keys function but SW13 only “ ”key are allowed. S4 SW25 When you push one key of SW11/12/13, SW26 you can push with another key of S5 S6 SW25/26/27/28. Otherwise, other SW27 S7 conditions are illegal. SW28 S8 SW25 and SW11 SW25 and SW12 SW25 and SW13 SW26 and SW11 SW26 and SW12 SW26 and SW13 SW27 and SW11 SW27 and SW12 SW27 and SW13 SW28 and SW11 SW28 and SW12 SW28 and SW13 4. TRANSMISSION CODE The transmission Code consists of 16 bits, namely: 8 bits custom code(C0~C7 ) and 8 bits data code (D0~D7). Please refer to the table below: C0 C1 C2 C3 C4 C5 C6 C7 D0 D1 D2 D3 D4 D5 D6 D7 Custom Code Data Code One frame of the Transmission Code If a Single Shot Key is depressed, data Codes— D6 and d7 will be given the value of (0,0).Please refer to the table1.If a valid double key operation is performed, the data codes will receive the values described in Table 2. Table 1: Key Matrix/Code Scan Output Data Octal display D0 D1 D2 S1 0 0 0 0 S2 1 0 0 1 S3 0 1 0 2 S4 1 1 0 3 S5 0 0 1 4 S6 1 0 1 5 S7 0 1 1 6 S8 1 1 1 7 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.2 2005.12.15 Page 4 of 12 SC50462 Data Key Input Octal display D3 D4 D5 I1 0 0 0 0 I2 1 0 0 1 I3 0 1 0 2 I4 1 1 0 3 I5 0 0 1 4 I6 1 0 1 5 I7 0 1 1 6 I8 1 1 1 7 Table 2: Double Key Signal/Code Scan Output S1/I1 (SW1 1) S2/I1 (SW1 2) S3/I1 (SW1 3) Data Code Octal Display D0 D1 D2 D3 D4 D5 D6 D7 D0~D2 D3~D5 D6~D7 S5/I2 (SW25) 0 0 1 1 0 0 1 0 4 1 1 S6/I2 (SW26) 1 0 1 1 0 0 1 0 5 1 1 S7/I2 (SW27) 0 1 1 1 0 0 1 0 6 1 1 S8/I2 (SW28) 1 1 1 1 0 0 1 0 7 1 1 S5/I2 (SW25) 0 0 1 1 0 0 0 1 4 1 2 S6/I2 (SW26) 1 0 1 1 0 0 0 1 5 1 2 S7/I2 (SW27) 0 1 1 1 0 0 0 1 6 1 2 S8/I2 (SW28) 1 1 1 1 0 0 0 1 7 1 2 S5/I2 (SW25) 0 0 1 1 0 0 1 1 4 1 3 S6/I2 (SW26) 1 0 1 1 0 0 1 1 5 1 3 S7/I2 (SW27) 0 1 1 1 0 0 1 1 6 1 3 S8/I2 (SW28) 1 1 1 1 0 0 1 1 7 1 3 5. CUSTOM CODE SC50462 has a total of 8 bits custom code (C0~C7). Custom Code Bits –C4 and C5 can be externally selected using the C4 and C5 Terminals. The C4 and C5 pins are inversed; therefore, if the C4 and C5 terminals are pulled HIGH, then the Custom Code Bits— C4 and C5 would have the Value(0,0). Likewise, when pulled LOW, then C4 and C5 bits will be (1,1),The other Customs Code Bits,namely:C0~C3 and C6,C7 are fixed at (1,1,1,0) and (1,0 ): The waveform of bits are given below: 0.25/0.26ms Bit "0" 1.00/1.05ms Bit "1" 2.00/2.10ms Note: Oscillator Frequency=480 or 455kHz HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.2 2005.12.15 Page 5 of 12 SC50462 6. KEY ON TIMING When any key is pressed, the output pin-- OUT continuously generates the waveform described below until the key is released. KEY ON 44ms/46.4ms OUT 1st Frame 2nd Frame n-th Frame Note: Oscillator Frequency=480 or 455kHz 7. CARRIER WAVEFORM The following is the carrier waveform diagram. A bit modulates 10 carrier waveforms. 1 Bit 10 pulses Carrier Wave 1/3 Duty Cycle a 2a a= 8.3µ s/8.76µ s Note: Oscillator Frequency=480 or 455kHz HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.2 2005.12.15 Page 6 of 12 SC50462 TYPICAL APPLICATION CIRCUIT HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.2 2005.12.15 Page 7 of 12 SC50462 CHIP TOPOGRAPHY 22 21 20 19 17 18 16 15 23 14 24 13 1 12 2 11 10 3 4 5 6 7 8 9 size: 1.96 x 2.07mm2 PAD COORDINATES (Unit: µm) No. Symbol X Y No. Symbol X Y 1 P1 -904.75 -122.00 13 P13 906.00 54.50 2 P2 -904.75 -258.25 14 P14 906.00 154.00 3 P3 -904.75 -709.00 15 P15 906.00 362.50 4 P4 -450.25 -851.25 16 P16 906.00 571.00 5 P5 -200.25 -851.25 17 P17 739.00 854.75 6 P6 80.75 -851.25 18 P18 530.50 854.75 7 P7 220.75 -851.25 19 P19 322.00 854.75 8 P8 501.75 -851.25 20 P20 113.50 854.75 9 P9 641.75 -851.25 21 P21 -564.75 854.75 10 P10 906.00 -615.50 22 P22 -773.25 854.75 11 P11 906.00 -475.50 23 P23 -904.75 248.00 12 P12 906.00 -194.50 24 P24 -857.00 12.00 Note: The original point of the coordinate is the die center. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.2 2005.12.15 Page 8 of 12 SC50462 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. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.2 2005.12.15 Page 9 of 12 SC50462 PACKAGE OUTLINE 3.00MIN 4.36MAX 7.62 0.25±0.05 UNIT: mm 6.40±0.25 SDIP-24-300-2.54 SOP-24-375-1.27 UNIT: mm 0.25±0.05 1.27 0.40 3.10MAX 15.34±0.25 13.97 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.2 2005.12.15 Page 10 of 12 SC50462 HANDLING MOS DEVICES: Electrostatic charges can exist in many things. All of our MOS devices are internally protected against electrostatic discharge but they can be damaged if the following precautions are not taken: • Persons at a work bench should be earthed via a wrist strap. • Equipment cases should be earthed. • All tools used during assembly, including soldering tools and solder baths, must be earthed. • MOS devices should be packed for dispatch in antistatic/conductive containers. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.2 2005.12.15 Page 11 of 12