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SX1276 View Datasheet(PDF) - Semtech Corporation

Part Name
Description
MFG CO.
'SX1276' PDF : 132 Pages View PDF
SX1276/77/78/79
WIRELESS, SENSING & TIMING
DATASHEET
4.2.5.6. Receiver Hopping, Rx to Rx
Two methods are possible:
First method
0
Timeline
TS_HOP
+TS_RE
Rx Mode,
Channel A
1. set new Frf
2. set RestartRxWithPllLock
Rx Mode,
Channel B
Second method
0
Timeline
~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
Tx Mode,
Channel A
1. set new Frf (*)
2. set FSTx mode
FSTx
Timeline
~PaRamp
+TS_HOP
+TS_TR
Set Tx mode
Tx Mode,
Channel B
Figure 22. Transmitter Hopping
4.2.6. Receiver Startup Options
The SX1276/77/78/79 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.
Rev. 4 - March 2015
©2015 Semtech Corporation
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