PT2272A-L2 Princeton Technology Corp., PT2272A-L2 Datasheet - Page 9

• Manufacturer Part Number: PT2272A-L2
• Description: Remote Control Decoder
• Manufacturer: Princeton Technology Corp.

Remote Control Decoder
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 38 KHz. Details are as follows:
CODE BITS
The Code Bits are further modulated with a 38 KHz carrier frequency and can be “0”, “1” or “f” bit. Their
waveforms are shown in the diagram below.
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 38 KHz frequency. To get the 38 KHz carrier frequency at the data output, the oscillator
frequency must be 76 KHz. A 440 KΩ 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.
PT2272 v3.5
Sync
OSC
0
1
f
Note:
20
20
= 2 clock lengths
60
- 9 -
160
620
URL: http://www.princeton.com.tw
Fax: [phone]
Tel: [phone]
June, 2004
PT2272