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AN4099 Scheda tecnica(PDF) 9 Page - STMicroelectronics

Il numero della parte AN4099
Spiegazioni elettronici  Implementing transmitters and receivers for infrared remote control protocols using STM32F0xx and STM32F3xx microcontrollers
PDF  39 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4099 Scheda tecnica(HTML) 9 Page - STMicroelectronics

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AN4099
Infrared protocol specification
Doc ID 023110 Rev 2
9/39
Figure 6 shows an example of a SIRC frame.
In this case: Command 26h (0100110b) and address Ah (01010b).
Figure 6.
Example of SIRC frame
An idle time is inserted between two successive frames in order to avoid collisions. Every
45 ms a repeat code is transmitted.
Note:
1
The infrared protocol implementation is based on free SIRC specifications downloaded from
http://www.sbprojects.com/knowledge/ir/sirc.php.
2
The table shows an overview of the data pulse-width tolerances used in this application
note. The min-max SIRC timing can be specified by the user.
Table 3.
SIRC timings
Description
Typical
Min.
Max.
Syn pulse high level
2.4 ms
2.3 ms
2.6 ms
Syn pulse low level
0.6 ms
0.55 ms
0.7 ms
Bit 0 period
1.2 ms
1.1 ms
1.3 ms
Bit 1period
1.8 ms
1.7 ms
1.9 ms
SIRC message reception time
45 ms
-
-
Carrier pulse bit time
25 µs
-
-
Start
1
0
2.4 ms
600 μs
1
0
0
0
10
0
01
1
Command bits
Address bits
MS18554V1



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