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SC5272 Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers |
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SC5272 Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers |
6 / 12 page Silan Semiconductors SC5272 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 2000.12.31 6 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: OSC "0" "1" "f" Sync 160 λ 20 λ 60 λ Note: λ=2 clock lengths 620 λ 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 440k Ω resistor connected between OSC1 and OSC2 pins of SC5262-IR is recommended. Moreover, for a matching decoder frequency, 1M Ω 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. 1st word 2nd word Sync bit Sync bit Ta Tb Tc Din Data pins (momentary) VT Ta= 8 OSC clock width Tb= 1 OSC clock width Tc=2 code word width |
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