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AN4099 데이터시트(PDF) 7 Page - STMicroelectronics

부품명 AN4099
상세설명  Implementing transmitters and receivers for infrared remote control protocols using STM32F0xx and STM32F3xx microcontrollers
PDF  39 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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AN4099
Infrared protocol specification
Doc ID 023110 Rev 2
7/39
Figure 2.
Example of an RC5 frame
To avoid frame collisions, an idle time is inserted between two successive frames with a
specific width (see Figure 3).
The idle time is defined as 50 bits wide. So, the periodicity of a frame is 64 x 1 bit width:
64 x 1.778 = 113.792 ms.
Figure 3.
RC5 idle time
Note:
The infrared protocol implementation is based on free RC5 specifications downloaded from
http://www.sbprojects.com/knowledge/ir/rc5.php.
Table 2.
RC5 timings
Description
Min.
Typical
Max.
RC5 half bit period
640 µs
889 µs
1140 µs
RC5 full bit period
1340 µs
1778 µs
2220 µs
RC5 message time
23.644 ms
24.889 µs
26.133 ms
RC5 message
repetition time
108.089 ms
113.778 ms
119.467 ms
Carrier pulse bit time
27.233 µs
27.778 µs
28.349 µs
110
00100111
5 address bits
S
0
11
6 command bits
FC
MS18531V1
MS18532V1
50 Bits
Frame1
Frame2
Idle time



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