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RFM95 Datasheet(PDF) 54 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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 54 page
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Page 54
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
Automatic restart capabilities are detailed in Section 4.2.7.
The receiver startup options available in RFM95/96/97/98(W) are described in Table 69.
Table 69 Receiver Startup Options
Triggering Event
Realized Function
AgcAutoOn
AfcAutoOn
RxTrigger
(2:0)
None
None
0
0
000
AGC
1
0
001
Rssi
Interrupt
AGC & AFC
1
1
001
AGC
1
0
110
PreambleDetect
AGC & AFC
1
1
110
AGC
1
0
111
Rssi
Interrupt
&
PreambleDetect
AGC & AFC
1
1
111
When AgcAutoOn=0, the LNA gain is manually selected by choosing LnaGain bits in RegLna.
4.2.7. Receiver Restart Methods
The options for restart of the receiver are covered below. This is typically of use to prepare for the reception of a new signal
whose strength or carrier frequency is different from the preceding packet to allow the AGC or AFC to be re-evaluated.
4.2.7.1. Restart Upon User Request
In Receive mode the user can request a receiver restart - this can be useful in conjunction with the use of a Timeout
interrupt following a period of inactivity in the channel of interest. Two options are available:
No change in the Local Oscillator upon restart: the AFC is disabled, and the Frf register has not been changed through
SPI before the restart instruction: set bit RestartRxWithoutPllLock in RegRxConfig to 1.
Local Oscillator change upon restart: if AFC is enabled (AfcAutoOn=1), and/or the Frf register had been changed during
the last Rx period: set bit RestartRxWithPllLock in RegRxConfig to 1.
Note
ModeReady must be at logic level 1 for a new RestartRx command to be taken into account.
4.2.7.2. Automatic Restart after valid Packet Reception
The bits AutoRestartRxMode in RegSyncConfig control the automatic restart feature of the RFM95/96/97/98(W) receiver,
when a valid packet has been received:
If AutoRestartRxMode = 00, the function is off, and the user should manually restart the receiver upon valid packet
reception (see section 4.2.7.1).
If AutoRestartRxMode = 01, after the user has emptied the FIFO following a PayloadReady interrupt, the receiver will
automatically restart itself after a delay of InterPacketRxDelay, allowing for the distant transmitter to ramp down, hence
avoiding a false RSSI detection on the ‘tail’ of the previous packet.
If AutoRestartRxMode = 10 should be used if the next reception is expected on a new frequency, i.e. Frf is changed
after the reception of the previous packet. An additional delay is systematically added, in order for the PLL to lock at a
new frequency.




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