SC5272

SC5272 REMOTE CONTROL DECODER PAIRED WITH SC5262 DESCRIPTION The SC5272 is a remote control decoder paired with SC5262 utilizing CMOS technology. It has a maximum of 12-bits of tri-state address pins providing up to 531,441(or 3 ) address codes; thereby, drastically reducing any code collision and unauthorized code scanning SOP-20 12 DIP-18 possibilities. FEATURES * Low power consumption and very high noise immunity * Up to 12 tri-state code address pins or 6 data pins * Wide operating voltage range(VCC=3V ~6V) * Single resistor oscillator * Latch or Momentary output type DIP-20 APPLICATION * Home/automation security system * Remote control toys or for industrial use * Remote control fan * Garage door controller ORDERING INFORMATION HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.2 2008.02.22 Page 1 of 13 SC5272 BLOCK DIAGRAM The Pin configurations are for DIP-18 package and are also some different with the SC5272 suffix (please refer to the Pin Configuration) ABSOLUTE MAXIMUM RATINGS(Tamb=25°C ) Characteristics Supply Voltage Input Voltage Output Voltage Maximum Power Dissipation Operating Temperature Storage Temperature Symbol VCC VIN VOUT Pa Topr Tstg Ratings -0.3 ~ 6 -0.3 ~ VCC+0.3 -0.3 ~ VCC+0.3 300 -20 ~ +70 -40 ~ +125 Unit V V V mW °C °C ELECTRICAL CHARACTERISTICS (Tamb=25°C,VCC=5V,unless otherwise specified) Characteristics Supply Voltage Dout Output driving Current Dout Output sinking Current Input High Voltage Input Low Voltage Symbol VCC IOH IOL VIH VIL VCC=5V,VOH=3V VCC=5V,VOL=3V Test Condition Min. 3 -3 2 0.7VCC 0 VCC 0.3VCC Typ. Max. 6 Unit V mA mA V V HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.2 2008.02.22 Page 2 of 13 SC5272 PIN CONFIGURATION HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.2 2008.02.22 Page 3 of 13 SC5272 PIN DESCRIPTION Pin No. 18 PIN 1~6 20 PIN 1~6 Pin Name Description Code Address pins No. 0~5. These six tri-state pins are detected by A0~A5 SC5272 to determine the encoded waveform bit 0 ~bit 5. Each pin can be set to “0”,”1”,”f”(floating). Code Address pins No.6~11/data pins No.5~0. These six pins are used higher address input bits or data output pins depending on the versions of SC5272 used.When these pins are used as address pins, they are tri7~8 10~13 7~8 12~15 A6/D5~A11/ D0 state input pins and can be set to “0”,”1”,”f”.When they are used as output pins, they are driven to Vcc if (1) the address decoded from the waveform that was received matches the address setting at address input pins, and (2) the corresponding data bits received is a “1” bits. Otherwise, they are driven to Vss. 14 15 16 17 18 9 -16 17 18 19 20 9 10~11 DIN OSC1 OSC2 VT VCC VSS NC Data Input Pin. The encode waveform received is serially fed to SC5272 at this pin. Oscillator pin 1 Oscillator pin 2 A resistor connected between these two pins determine the fundamental frequency of SC5272. Valid Transmission. Active high signal. VT in high state signifies that SC5272 receives valid transmission waveform. Positive Power Supply Negative Power Supply No Connection FUNCTION DESCRIPTION The SC5272 decodes the waveform received and fed into the Din pin. The waveform is decoded into code word that contains the address, data and Sync bits. The decoded address bits are compared with the address set at the address input pins. If both addresses match for 2 consecutive code words, SC5272 drives: a). The data output pins whose corresponding data bits is then decoded to be a "1" bit b). The VT output --to high voltage (high state). 1. RF OPERATION Code Bits A code bit is the basic component of the encoded waveform, and can be classified as either an AD (Address/Data) Bit or a SYNC (Synchronous) Bit. An AD bit can be designated as bit “ 0 ”, “ 1 ” or “ f ” if it is in low, high or floating state respectively. One bit waveform consists of two pulse cycles. Each pulse cycle has 16 oscillating time periods. For further details, please refer to the diagram below: HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.2 2008.02.22 Page 4 of 13 SC5272 32a a OSC bit "0" bit "1" bit "f" 4a 12a 12a 4a Where: a = oscillating clock period . Bit “ f ” is only available for address bits. The Synchronous bit waveform is 4 bits long with 1/8 bit width pulse. Please refer to the diagram below: 1/8 bit width=4a 4 bit width=128a Note: 1bit =32a Code word A group of Code Bits is called a Code Word. A Code Word consists of 12 AD bits followed by one Sync. Bit. The 12 AD bits are interpreted as either address or data bits depending on the SC5272 version used. Please refer to the diagram below: A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 SYNC Single Resistor Oscillator The Build-in oscillator circuitry of SC5272 allows a precision oscillator to be constructed by connecting an external resistor between OSC1 and OSC2 pins. For SC5272 to decode correctly the received waveform, the oscillator frequency of SC5272 must be 2.5 ~8 times that of transmitting SC5262. It is a good practice to center the SC5272 oscillator frequency in the window to gain best window margin at both sides. The typical oscillator frequency with various resistor values for both SC5262 and SC5272 are shown below: HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.2 2008.02.22 Page 5 of 13 SC5272 2. IR OPERATION In the IR Type of operation, the functions are similar to the above descriptions except that the output waveform carried by SC5262-IR has a frequency of 38kHz. Details are as follows. Code Bits The Code Bits are further modulated with a 38kHz carrier frequency and can be”0”,”1” or “ f ” bit. Their waveform are shown below: Code Word A Code Word is made up of code bits and the format is the same as that of the RF Code Word. Code Frame Likewise, a Code Frame is made up of Code Words and the format is the same as that of RF type of operation. Oscillator The SC5262-IR is specially designed for infrared remote control applications and its output waveform carries 38kHz frequency. To get the 38kHz carrier frequency at the data output, the oscillator frequency must be 76kHz. A 440kΩ resistor connected between OSC1 and OSC2 pins of SC5262-IR is recommended. Moreover, for a matching decoder frequency, 1MΩ resistor connected between the OSC1 and OSC2 pins of SC5272 is also recommended. 3. VALID TRANSMISSION When the SC5272 receives a transmission code word, it initially checks whether this is a valid transmission. For a transmission to be valid, (1) it must be a complete code word, and (2) the address bits must match the address setting at the address pins. After two consecutive valid transmission, SC5272 (1) drives the data pins according to the data bits received, and (2) rise VT to high voltage(high state). The timings are shown in the following diagram. Sync bit 1st word 2nd word Sync bit Din Data pins (momentary) VT Ta= 8 OSC clock width Tb= 1 OSC clock width Tc=2 code word width Ta Tc Tb HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.2 2008.02.22 Page 6 of 13 SC5272 4. LATCH or MOMENTARY DATA OUTPUT TYPE The SC5272 uses either the latch or momentary data output type depending on the SC5272 version used. The latch type SC5272-LXactivates the data out during transmission and this data is sustained in the memory until another data is inputted or entered. A momentary type(SC5272-MXon the other hand, activates the data out only during transmission. In the momentary type, the data does not remain in the memory after the transmission is completed. Please refer to the diagram below: OPERATION FLOW CHART Decoder Without Data Output Pin 1. When the power is turned on, the SC5272 activates the Stand-By Mode. 2. It then search for signals, If there is no signal received, it remains in the Stand-By Mode; otherwise, the address bits received are compared with the address configuration of the pins. 3. The VT goes high signifying the validation of transmission only when there are two continuous frames that contain matched address bit; otherwise, VT will not be activated and the Stand-By Mode remains active. 4. Then , the address bits are again checked. Two continuous mismatches of the address bits would disable the VT and make the Stand-By Mode active; otherwise, the address bits are continuous checked. Decoder Without Data Output Pin HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.2 2008.02.22 Page 7 of 13 SC5272 Decoder With Data Output Pins 1. When the power is turned on , the SC5272 activates the Stand-By Mode. 2. It then searches for signal. If there is no signal received, it remains in the Stand-By Mode; otherwise, the address bits are compared with the address configuration of the pins. 3. Whenever the address bits in frame match with that of the address configuration of the pin, the data bits are stored into memory. Also, when this IC finds two continuous and identical data having the same address bits, the data outputs is activated and the VT is enabled. The VT is disabled when there are two continuous mismatched addresses. For the momentary type, the data output is reset; while for the latch type, the data output is sustained. Decoder With Data Output Pins HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.2 2008.02.22 Page 8 of 13 TYPICAL APPLICATION CIRCUIT HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn 5V Receiving Block SC5272 13mH 47k 47k 9 14 15 Rosc 16 18 0.01 F 1pF 47k + UTC358 47k 100k 10M 2pF + UTC358 27k Vcc=5V 33pF A L1 270pF REV:1.2 SC5272 2008.02.22 Page 9 of 13 SC5272(No Data) RF Application Circuit SC5272 TYPICAL APPLICATION CIRCUIT (CONTINUED) SC5272-L4(4 Data) RF Application Circuit 1M SC5272-L4(4 Data) IR Application Circuit HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn 2SC1815 10k SC5272-L4 REV:1.2 2008.02.22 Page 10 of 13 SC5272 PACKAGE OUTLINE DIP-18-300-2.54 UNIT: mm DIP-20-300-2.54 UNIT: mm 6.60±0.25 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn 3.00MIN 4.36MAX 7.62TYP REV:1.2 2008.02.22 Page 11 of 13 0.25±0.10 SC5272 PACKAGE OUTLINE (CONTINUED) SOP-20-375-1.27 UNIT: mm 10.2±0.4 7.6±0.3 0.25±0.05 1.27 12.7±0.25 0.4 3.1MAX 11.43 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:1.2 9.525 2008.02.22 Page 12 of 13