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SC5272 Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers

Part # SC5272
Description  REMOTE CONTROL DECODER
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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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