| IR Codes | |
|
|
|
Remote Control IR Code
Output waveform
single pulse, modulated with 37.917kHz signal at 455kHz
|
|
|
| Tc |
|
| Carrier frequency | |
|
|
|
|
|
| |||
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
| FCAR = 1 / Tc = fosc / 12 |
|
|
|
| T1 |
|
| ||
|
|
|
|
|
| |||
|
|
|
|
|
| Duty ratio = T1 / Tc = 1 / 3 | ||
|
|
|
|
|
|
|
| |
►Configuration of frame
▪1st frame
Lead code
Low | High | Data code |
| |
Data code | ||||
custom code | custom code | |||
|
|
C0 C1 C2 C3 C4 C5 C6 C7 C0 C1 C2 C3 C4 C5 C6 C7 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7
▪Repeat frame
Repeat code
►Lead code
9 ms
►Repeat code
9 ms
Tf
4.5 ms
0.55ms
2.25 ms
►Bit description
▪Bit "0"
0.56 ms
▪Bit "1"
0.56 ms
1.12 ms
2.24 ms
►Frame interval : Tf
▪The waveform is transmitted as long as a key is depressed.
Tf
Tf
Tf = 108 ms @ 455 kHz
A31