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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LLCC68 датащи(PDF) 37 Page - Semtech Corporation |
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LLCC68 датащи(HTML) 37 Page - Semtech Corporation |
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37 / 106 page  LLCC68 Data Sheet Rev. 1.0 DS.LLCC68.W.APP July 2019 37 of 106 Semtech www.semtech.com On the LLCC68, the channel activity detection mode is designed to detect the presence of a LoRa® preamble or data symbols while the previous generations of products were only able to detect LoRa® preamble symbols. Once in CAD mode, the LLCC68 will perform a scan of the band for a user-selectable duration (defined in number of symbols) and will then return with the Channel Activity Detected IRQ if LoRa® symbols have been detected during the CAD. The time taken for the channel activity detection is dependent upon the LoRa® modulation settings used. For a given configuration (SF/BW) the typical CAD detection time can be selected to be either 1, 2, 4, 8 or 16 symbols. Once the duration of the selected number of symbols has been done, the radio will remains for around half a symbol in Rx to post-process the measurement. |
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