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| Silan Semiconductors REMOTE CONTROL ENCODER DESCRIPTION The SC2268 is a remote control encoder utilizing CMOS Technology specially designed for use with the SC2128. Using a special coding technique, SC2268 increases noise immunity to a very great extent. It is housed in 16-Pins DIP Package and has a maximum of eight input channels. Its high performance features makes SC2268 a must in every fan and other electrical home appliance remote control application. SC2268 FEATURES * CMOS Technology * Low power consumption * Very high noise immunity * Wide range of operating voltage: Vcc=2.2 ~ 5.0 Volts * Transmits signals to a maximum of 8 channels * Start word custom code options available DIP-16 APPLICATIONS * Fan remote control * Air cleaner * Humidifier * Heater ORDERING INFORMATION SC2268 SC2268-00 Custom Cord C3=1 Custom Cord C3=0 PIN CONFIGURATION BLOCK DIAGRAM Vcc 16 OSCI 15 Vss 9 I1 I2 I3 I4 1 2 3 4 16 Vcc 15 OSCI 14 OSCO Tx OSC OSCO 14 Timing circuit I1 1 I2 2 I3 3 I4 4 13 OUT SC2268 I5 5 12 C4 I6 I7 I8 Encoder Key input scanning and sampling Output Waveform Generator 13 Tx OUT 6 7 8 11 C5 10 C6 9 Vss I5 5 I6 6 I7 7 I8 8 12 C4 11 10 C5 C6 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 2000.12.31 1 Silan Semiconductors ABSOLUTE MAXIMUM RATINGS Characteristic Supply Voltage Input/Output Voltage Power Dissipation Operating Temperature Storage Temperature SC2268 Symbol VCC VIN/VOUT PD Topr Tstg Value 0 ~ 6.0 Vss-0.2V ~ VCC+0.3V 500 -20 ~ +70 -55 ~ +125 Unit V V mW C C ELECTRICAL CHARACTERISTICS(Tamb=0 ~ 70C,VCC-VSS =3 10%V,Unless otherwise specified) Parameter Operating Voltage Operating Current(note) Standy-by Current Sinking Current of TxOUT Input Voltage of I1 ~I8 High Level Low level Symbol VCC IOP ISB ISINK VIH VIL RL RH fOSC Test conditions -OSC On, TxOUT is floating. I1 ~ I8 = "L" OSC Stops. TxOUT is floating. VOL=2.2V, VDD=3V VOL=1.5V, VDD=3V ------ Min 2.2 -0.5 8 4 0.7VCC 0 30 40 -- Typ 3 0.5 1 15 6 --50 90 455 Max 5 1 3 --VCC 0.3VCC 80 150 -- Unit V mA A mA V k k kHz Input Pull-Low Resistor Input Pull-High Resistor Oscillation frequency Note: For pins I1 ~ I8 : Any one of the said pins is set to HIGH while the others are set to LOW. PIN DESCRIPTION Pin No. 1~8 9 11~12 10 Symbol I1 ~ I8 Vss C4~C5 C6 I/O Key input pins. I -I I Function These pins are used to connect a maximum of 8 keys. (each pin has a built-in pull-low resistor). Negative power supply. Select input pin for start word. These pins have internal pull-low resistor. Select input pin for start word. This pins have internal pull-high resistor. Transmission output pin. This pin is an open drain (NMOS) output and is used to transmit signals. The carrier frequency is 38kHz. Oscillator Input Pin Oscillator Outpu Pin Positive power supply. These pins are used to externally connect a 455kHz ceramic resonator. 13 15 14 16 TxOUT OSCI OSCO Vcc O I O -- HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 2000.12.31 2 Silan Semiconductors FUNCTIONAL DESCRIPTION 1. KEY INPUT Up to eight keys can be directly connected to pins I1 ~ I8. Please refer to the diagram right. Furthermore, SC2268 has a buit-in pull-low resistor of about 60K ~ 110K which reduces the need for external components. Vcc 1 I1 2 I2 3 I3 4 I4 5 I5 6 I6 7 I7 8 I8 SC2268 SC2268 2. OSCILLATOR An oscillation circuit can be constructed using the CMOS inverter and Built-in Feedback resistor, 455kHz crystal and two 220pf capacitors. The carrier frequency is 38kHz. Unless any of the 8 keys (I1~I8) is being operated, the oscillation is automatically stopped. Thus, power consumption is considerably reduced. 220pf 455kHz 220pf 15 SC2268 OSCI OSCO 14 3. TRANMISSION WAVEFORM When any of the 8 keys (I1 ~ I8) is set to "High", the TxOUT outputs one start word followed by 2 identical data words and a space. The code will be continuously outputted until the key is released. If for any reason, the key was released during the code transmission process, the code that is being transmitted during the key release action will still be completely outputted. Please refer to the following diagram. I1 ~ I8 Tx OUT Start Data Data Start Data Data Space Space Word Word Word Word Word Word 20ms 80ms 1 Frame = 80ms *OSC = 455kHz Start Data Data Space Word Word Word HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 2000.12.31 3 Silan Semiconductors 4. TRANSMISSION CODE WAVEFORM SC2268 The transmission waveforms of the Start Word and the different Data Words generated when a specific input key (I1~I8) is pressed are illustrated below (see also Transmission Code Pattern Sectioon): CLK start W1 W2 W3 W4 W5 W6 W7 W8 1 0 X 3X X X=0.625ms 5. TRANSMISSION CODE PATTERN The transmission code pattern of SC2268 is given in the table below. LSB C0 0 B0 Data Word (Key pressed) W1 (I1) W2 (I2) W3 (I3) W4 (I4) W5 (I5) W6 (I6) W7 (I7) W8 (I8) 0 0 0 1 1 1 1 1 C1 0 B1 0 1 1 0 0 0 1 1 C2 1 B2 1 0 1 0 1 1 0 0 C3 1 B3 1 1 0 1 0 1 0 1 C4 0 B4 1 1 0 1 0 0 0 0 C5 0 B5 0 0 0 1 1 0 1 0 C6 1 B6 1 0 1 0 1 0 0 1 MSB C7 1 B7 0 0 0 0 0 1 1 0 0/p1 0/p2 0/p3 0/p4 0/p5 0/p6 0/p7 0/p8 Transmission Start word Receiver HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 2000.12.31 4 Silan Semiconductors 6. START WORD CUSTOM CODE The start word custom code has the following format: LSB 0 0 1 C3 C4 C5 C6 MSB 1 SC2268 Where: C3 = 1 (default value) = bonding option available C4 = "0" when floating or connected to Vss = "1" when connected to Vcc C5 = "0" when floating or connected to Vss = "1" when connected to Vcc C6 = "0" when connected to Vss = "1" when floating or connected to Vcc Note: C4 and C5 have internal pull-low resistors while C6 has an internal pull-high resistor. The start word custom code table is given below : C3=0 C4 0 0 0 0 1 1 1 1 C5 0 0 1 1 0 0 1 1 C6 0 1 0 1 0 1 0 1 Custom Code (C0 to C7) 00100001 00100011 00100101 00100111 00101001 00101011 00101101 00101111 C3=1(default) Custom Code (C0 to C7) 00110001 00110011 00110101 00110111 00111001 00111011 00111101 00111111 OPERATION FLOW CHART Power on Stand by No Key press? Yes Enable oscillator Debounce Code correct? Yes One frame code transmit No No Key released? Yes HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 2000.12.31 5 Silan Semiconductors APPLICATION CIRCUIT 3V battery 47f * SC2268 1 2 3 4 5 6 7 8 SC2268 I1 I2 I3 Vcc OSCI OSCO 16 220pf 15 455kHz 14 220pf 10 I4 Tx OUT I5 I6 I7 I8 C4 C5 C6 Vss 13 12 11 10 9 1k IR LED Note: Please take note that C3(default value)=1. For more details, please refer to Start Word Custom Cord Section. * Place 47uf capacitor as near as possible to the SC2268 Vss pin. PACKAGE OUTLINE DIP-16-300-2.54 2.54 0.25 6.40 1.50 19.4 7.62 UNIT:mm 15 degree 3.51 0.46 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 2000.12.31 6 3.30 5.08 |
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