sc5272-l6 Silan, sc5272-l6 Datasheet - Page 6

• Manufacturer Part Number: sc5272-l6
• Description: Remote Control Decoder Paired With Sc5262
• Manufacturer: Silan

2. IR OPERATION
carried by SC5262-IR has a frequency of 38kHz. Details are as follows.
Code Bits
waveform are shown below:
Code Word
Code Frame
Oscillator
38kHz frequency. To get the 38kHz carrier frequency at the data output, the oscillator frequency must be 76kHz.
matching decoder frequency, 1MΩ resistor connected between the OSC1 and OSC2 pins of SC5272 is also
recommended.
3. 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).
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
A Code Word is made up of code bits and the format is the same as that of the RF Code Word.
Likewise, a Code Frame is made up of Code Words and the format is the same as that of RF type of operation.
The SC5262-IR is specially designed for infrared remote control applications and its output waveform carries
When the SC5272 receives a transmission code word, it initially checks whether this is a valid transmission.
The timings are shown in the following diagram.
In the IR Type of operation, the functions are similar to the above descriptions except that the output waveform
The Code Bits are further modulated with a 38kHz carrier frequency and can be”0”,”1” or “ f ” bit. Their
A 440kΩ resistor connected between OSC1 and OSC2 pins of SC5262-IR is recommended. Moreover, for a
(momentary)
Data pins
Din
VT
1st word
Ta= 8 OSC clock width
Tb= 1 OSC clock width
Tc=2 code word width
Sync bit
2nd word
Ta
Tb
Sync bit
Tc
REV:1.2
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SC5272
2008.02.22