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RFM95 Datasheet(PDF) 53 Page - HOPE Microelectronics CO., Ltd.

Part No. RFM95
Description  Low Power Long Range Transceiver Module
Download  121 Pages
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Maker  HOPE [HOPE Microelectronics CO., Ltd.]
Homepage  https://www.hoperf.com/
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 53 page
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Page 53
RFM95/96/97/98(W)
Tel: + 86-755-82973805
Fax: + 86-755-82973550
E-mail: sales@hoperf.com http:/ / www.hoperf.com
WIRELESS & SENSING
PRELIMINARY
DATASHEET
4.2.5.6. Receiver Hopping, Rx to Rx
Two methods are possible:
First method
Timeline
0
TS_HOP
+TS_RE
Rx Mode,
Channel A
1. set new Frf
2. set RestartRxWithPllLock
Rx Mode,
Channel B
Second method
Timeline
0
~TS_HOP
Rx Mode,
Channel A
1. set FastHopOn=1
2. set new Frf (*)
3. wait for TS_HOP
Rx Mode,
Channel B
(*) RegFrfLsb must be written to
trigger a frequency change
Figure 21. Receiver Hopping
The second method is quicker, and should be used if a very quick RF sniffing mechanism is to be implemented.
4.2.5.7. Tx to Tx
0
~PaRamp
+TS_HOP
~PaRamp
+TS_HOP
+TS_TR
Timeline
Tx Mode,
Channel A
1. set new Frf (*)
2. set FSTx mode
FSTx
Set Tx mode
Tx Mode,
Channel B
Figure 22. Transmitter Hopping
4.2.6. Receiver Startup Options
The RFM95/96/97/98(W) receiver can automatically control the gain of the receive chain (AGC) and adjust the
receiver LO
frequency (AFC). Those processes are carried out on a packet-by-packet basis. They occur:
When the receiver is turned On.
When the Receiver is restarted upon user request, through the use of trigger bits RestartRxWithoutPllLock or
RestartRxWithPllLock
, in RegRxConfig.
When the receiver is automatically restarted after the reception of a valid packet, or after a packet collision.




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