Data Sheet

Page 53
RFM95/96/97/98(W)
Tel: + 86-755-82973805 Fax: + 86- 755-82973550 E-mail: [e-mail] 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 M ode,
Channel A
1. set new Fr f
2. set
RestartRxWithPllLock
Rx Mode,
Channel B
Second m ethod
Timeline
0
~TS_HOP
Rx M ode,
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.