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RF96 Arkusz danych(PDF) 23 Page - HOPE Microelectronics CO., Ltd.

Numer części RF96
Szczegółowy opis  Low Power Long Range Transceiver
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Producent  HOPE [HOPE Microelectronics CO., Ltd.]
Strona internetowa  https://www.hoperf.com/
Logo HOPE - HOPE Microelectronics CO., Ltd.

RF96 Arkusz danych(HTML) 23 Page - HOPE Microelectronics CO., Ltd.

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Page 23
RF96/97/98
Tel: +86-755-82973805
Fax: +86-755-82973550
E-mail: sales@hoperf.com http://www.hoperf.com
WIRELESS & SENSING
PRELIMINARY
DATASHEET
4.1.1. Link Design Using the LoRa
TM Modem
4.1.1.1. Overview
The LoRaTM modem is setup as shown in the following figure. This configuration permits the simple replacement of the FSK
modem with the LoRaTM modem via the configuration register setting RegOpMode. This change can be performed on the
fly (in Sleep operating mode) thus permitting the use of both standard FSK or OOK in conjunction with the long range
capability. The LoRaTM modulation and demodulation process is proprietary, it uses a form of spread spectrum modulation
combined with cyclic error correction coding. The combined influence of these two factors is an increase in link budget and
enhanced immunity to interference.
Figure 4. LoRa
TM Modem Connectivity
A simplified outline of the transmit and receive processes is also shown above. Here we see that the LoRaTM modem has an
independent dual port data buffer FIFO that is accessed through an SPI interface common to all modes. Upon selection of
LoRaTM
mode, the configuration register mapping of the RF96/97/98 changes. For full details of this change please
consult the register description of Section 6.
So that it is possible to optimise the LoRaTM modulation for a given application, access is given to the designer to three
critical design parameters. Each one permitting a trade off between link budget, immunity to interference, spectral
occupancy and nominal data rate. These parameters are spreading factor, modulation bandwidth and error coding rate.


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