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PT2272-S Datasheet(PDF) 9 Page - Princeton Technology Corp |
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PT2272-S Datasheet(HTML) 9 Page - Princeton Technology Corp |
9 / 22 page Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2272 V3.7 - 9 - June, 2008 Remote Control Decoder PT2272 IR OPERATION In the IR Type of Operation, the functions are similar to the above descriptions, except that the output waveform carried by PT2262-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 waveforms are shown in the diagram below. 160 20 60 20 620 OSC 0 1 f Sync Note: = 2 clock lengths CODE WORD A Code Word is made up of code bits and the format is the same as that of the RF Code Frame. 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 PT2262-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 PT2262-IR is recommended. Moreover, for a matching decoder frequency, 1MΩ resistor connected between the OSC1 and OSC2 pins of PT2272 is also recommended. |
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