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RFM95 Datasheet(PDF) 21 Page - HOPE Microelectronics CO., Ltd.

Part No. RFM95
Description  Low Power Long Range Transceiver Module
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Maker  HOPE [HOPE Microelectronics CO., Ltd.]
Homepage  https://www.hoperf.com/
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 21 page
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Page 21
RFM95/96/97/98(W)
Tel: + 86-755-82973805
Fax: + 86-755-82973550
E-mail: sales@hoperf.com http:/ / www.hoperf.com
All major parameters of the RF front end and digital state machine are fully configurable via an SPI interface which gives
access to RFM95/96/97/98(W)’s configuration registers. This includes a mode auto sequencer that oversees the
transition and calibration of the RFM95/96/97/98(W) between intermediate modes of operation in the fastest time possible.
The RFM95/96/97/98(W) are equipped with both standard FSK and long range spread spectrum (LoRaTM) modems.
Depending upon the mode selected either conventional OOK or FSK modulation may be employed or the LoRaTM  spread
spectrum modem.
3.1. LoRa
TM
  Modem
The LoRaTM   modem uses a proprietary spread spectrum modulation technique. This modulation, in contrast to legacy
modulation techniques, permits an increase in link budget and increased immunity to in-band interference. At the same
time the frequency tolerance requirement of the crystal reference oscillator is relaxed - allowing a performance increase for
a reduction in system cost. For a fuller description of the design trade-offs and operation of the RFM95/96/97/98(W)
please consult Section 4.1 of the datasheet.
3.2. FSK/OOK Modem
In FSK/OOK mode the RFM95/96/97/98(W) supports standard modulation techniques including OOK, FSK, GFSK, MSK
and GMSK. The RFM95/96/97/98(W) is especially suited to narrow band communication thanks the low-IF architecture
employed and the built-in AFC functionality. For full information on the FSK/OOK modem please consult Section 4.2 of this
document.




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