Data Sheet

Page 90
RFM95/96/97/98(W)
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WIRELESS & SENSING PRELIMINARY DATASHEET
Name
(Address)
Bits
Variable Name
Mode
Default
value
FSK/OOK Description
7 RestartRxOnCollision rw 0x00
Turns on the mechanism restarting the receiver automatically if it
gets saturated or a packet collision is detected
0 Æ No automatic Restart
1 Æ Automatic restart On
6 RestartRxWithoutPllLock wt 0x00
Triggers a manual Restart of the Receiver chain when set to 1.
Use this bit when there is no frequency change,
RestartRxWithPllLock otherwise.
5 RestartRxWithPllLock wt 0x00
Triggers a manual Restart of the Receiver chain when set to 1.
Use this bit when there is a frequency change, requiring some
time for the PLL to re-lock.
4 AfcAutoOn rw 0x00
0 Æ No AFC performed at receiver startup
1 Æ AFC is performed at each receiver startup
3 AgcAutoOn rw 0x01
0 Æ LNA gain forced by the LnaGain Setting
1 Æ LNA gain is controlled by the AGC
RegRxConfig
(0x0d)
2-0 RxTrigger rw
0x06
*
Selects the event triggering AGC and/or AFC at receiver startup.
See Table 18 for a description.
7-3 RssiOffset rw 0x00
Signed RSSI offset, to compensate for the possible losses/gains
in the front-end (LNA, SAW filter...)
1dB / LSB, 2’s complement format
RegRssiConfig
(0x0e)
2-0 RssiSmoothing rw 0x02
Defines the number of samples taken to average the RSSI result:
000 Æ 2 samples used
001 Æ 4 samples used
010 Æ 8 samples used
011 Æ 16 samples used
100 Æ 32 samples used
101 Æ 64 samples used
110 Æ 128 samples used
111 Æ 256 samples used
RegRssiCollision
(0x0f)
7-0 RssiCollisionThreshold rw 0x0a
Sets the threshold used to consider that an interferer is detected,
witnessing a packet collision. 1dB/LSB (only RSSI increase)
Default: 10dB
RegRssiThresh
(0x10)
7-0 RssiThreshold rw 0xff
RSSI trigger level for the Rssi interrupt:
- RssiThreshold / 2 [dBm]
RegRssiValue
(0x11)
7-0 RssiValue r -
Absolute value of the RSSI in dBm, 0.5dB steps.
RSSI = - RssiValue/2 [dBm]
7 unused r - unused
6-5 reserved rw 0x00 reserved
4-3 RxBwMant rw 0x02
Channel filter bandwidth control:
00 Æ RxBwMant = 16 10 Æ RxBwMant = 24
01 Æ RxBwMant = 20 11 Æ reserved
RegRxBw
(0x12)
2-0 RxBwExp rw 0x05
Channel filter bandwidth control:
FSK Mode:
RxB w =
------------------------
F
----
X
----
O
----
S
----
C
-------------------------
Rx BwMant
× 2
RxBwExp + 2