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RF96 Datasheet(PDF) 39 Page - HOPE Microelectronics CO., Ltd.

Part # RF96
Description  Low Power Long Range Transceiver
Download  121 Pages
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Manufacturer  HOPE [HOPE Microelectronics CO., Ltd.]
Direct Link  https://www.hoperf.com/
Logo HOPE - HOPE Microelectronics CO., Ltd.

RF96 Datasheet(HTML) 39 Page - HOPE Microelectronics CO., Ltd.

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Page 39
RF96/97/98
Tel: +86-755-82973805
Fax: +86-755-82973550
E-mail: sales@hoperf.com http://www.hoperf.com
WIRELESS & SENSING
PRELIMINARY
DATASHEET
Principle of Operation
The channel activity detection mode is designed to detect a LoRa preamble on the radio channel with the best possible
power efficiency. Once in CAD mode, the RF96/97/98 will perform a very quick scan of the band to detect a LoRa packet
preamble.
During a CAD the following operations take place:
The PLL locks
The radio receiver captures LoRa preamble symbol of data from the channel. The radio current consumption during that
phase corresponds to the specified Rx mode current
The radio receiver and the PLL turn off, and the modem digital processing starts.
The modem searches for a correlation between the radio captured samples and the ideal preamble waveform. This
correlation process takes a little bit less than a symbol period to perform. The radio current consumption during that
phase is greatly reduced.
Once the calculation is finished the modem generates the CadDone interrupt. If the correlation was successful,
CadDetected
is generated simultaneously.
The chip goes back to stand-by mode.
If a preamble was detected, clear the interrupt, then initiate the reception by putting the radio in RX single mode or RX
continuous mode.
The time taken for the channel activity detection is dependent upon the LoRa modulation settings used. For a given
configuration the typical CAD detection time is shown in the graph below, expressed as a multiple of the LoRa symbol
period. Of this period the radio is in receiver mode for (2SF + 32) / BW seconds. For the remainder of the CAD cycle the
radio is in a reduced consumption state.
Figure 11. Channel activity detection (CAD) time as a function of spreading factor


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