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AN4099 数据表(PDF) 9 Page - STMicroelectronics |
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AN4099 数据表(HTML) 9 Page - STMicroelectronics |
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9 / 39 page  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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