 |
 |
 |
 |
IR Protocol Formats described in this document:
Sony
Matsushita
NEC
RC5
1. Sony
The
modulated carrier is usually derived from 480kHz and is 1/12 of the frequency
with 1/3 duty cycle.
When
data are transmitted repeatedly, the frame cycle is 45ms or 150 period.
A
frame consists of a syn pulse, a seven-bit data code and a five-bit custom
code.
The
timing definitions of the output code waveform are shown below.
 |
|||||
 |
|||||
 |
|||||
 |
|||||
Data Item
|
Time (sec.)
|
Time (no. of period)
|
Syn pulse
|
2.4ms
|
8T
|
Data off time
|
0.61ms
|
2T
|
Data on time (0)
|
0.59ms
|
2T
|
Data on time (1)
|
1.19ms
|
4T
|
Data period (0)
|
1.2ms
|
4T
|
Data period (1)
|
1.8ms
|
6T
|
Frame output cycle
|
45ms
|
150T
|
Where T=0.3ms
2. Matsushita
The
modulated carrier is usually derived from 440kHz and is 1/12 of the frequency
with 1/2 duty cycle.
When
data are transmitted repeatedly, the frame cycle is 104.7ms or 240 period.
A
frame consists of a syn pulse, a six-bit custom code, six-bit data code, a six-bit
inverted custom code and a six-bit inverted data code.
The
timing definitions of the output code waveform are shown below.
Data Item
|
Time (sec.)
|
Time (no. of period)
|
Syn pulse on time
|
3.49ms
|
8T
|
Syn pulse off time
|
3.49ms
|
8T
|
Data on time (0)
|
0.86ms
|
2T
|
Data off time (0)
|
0.88ms
|
2T
|
Data on time (1)
|
0.86ms
|
2T
|
Data off time (1)
|
2.63ms
|
6T
|
Data period (0)
|
1.74ms
|
4T
|
Data period (1)
|
3.49ms
|
8T
|
Frame output cycle
|
104.7ms
|
240T
|
Where T=0.436ms
3. NEC
The
modulated carrier is usually derived from 455kHz and is 1/12 of the frequency
with 1/3 duty cycle.
When
data are transmitted repeatedly, the frame cycle is 107.9ms or 186 period.
A
frame consists of a syn pulse, an eight-bit custom code, an eight-bit inverted
custom code, an eight-bit data code and an eight-bit inverted data code.
The
timing definitions of the output code waveform are shown below.
 |
||||||
 |
||||||
 |
||||||
 |
||||||
 |
||||||
Data Item
|
Time (sec.)
|
Time (no. of period)
|
Syn pulse on time
|
8.993ms
|
15.5T
|
Syn pulse off time
|
4.642ms
|
8T
|
Syn pulse off time
(subsequent frame)
|
2.321ms
|
4T
|
Data on time (0)
|
0.561ms
|
T
|
Data off time (0)
|
0.598ms
|
T
|
Data on time (1)
|
0.561ms
|
T
|
Data off time (1)
|
1.7582.63ms
|
3T
|
Data period (0)
|
1.160ms
|
2T
|
Data period (1)
|
2.321ms
|
4T
|
Frame output cycle
|
107.9ms
|
186T
|
Where T=0.58ms
4. RC5
The
modulated carrier is usually derived from 432kHz and is 1/12 of the frequency
with 1/3 duty cycle.
When
data are transmitted repeatedly, the frame cycle is 113.7ms or 256 period.
A
frame consists of a two-bit syn code, a one-bit control code, a five-bit system
code, and a six-bit data code.
The
timing definitions of the output code waveform are shown below.
 |
|||
 |
|||
 |
|||
Data Item
|
Time (sec.)
|
Time (no. of period)
|
Data off time
|
0.888ms
|
2T
|
Data on time
|
0.888ms
|
2T
|
Data period (0)
|
3.552ms
|
4T
|
Data period (1)
|
3.552ms
|
4T
|
Frame output cycle
|
113.7ms
|
256T
|
Where T=0.444ms
| sales@infraredremotes.com |