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RFM95 Datasheet(PDF) 82 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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 82 page
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Page 82
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
Table 83 RssiSmoothing Options
RssiSmoothing
Number of Samples
Estimated Accuracy
Response Time
‘000’
2
± 6 dB
‘001’
4
± 5 dB
‘010’
8
± 4 dB
‘011’
16
± 3 dB
‘100’
32
± 2 dB
‘101’
64
± 1.5 dB
‘110’
128
± 1.2 dB
‘111’
256
± 1.1 dB
2
(RssiSmoothing+1)
4 · RxBw
[kHz]
[ms]
The RSSI is calibrated when the image and RSSI calibration process is launched.
5.5.5. RSSI in LoRa
TM
 
Mode
The RSSI values reported by the LoRaTM  modem differ from those expressed by the FSK/OOK modem. The following
formula shows the method used to interpret the LoRaTM RSSI values.
RSSI[dBm] = –137 + RSSI
5.5.6. Channel Filter
The role of the channel filter is to reject noise and interference outside of the wanted channel. The RFM95/96/97/98(W)
channel filtering is implemented with a 16-tap finite impulse response (FIR) filter. Rejection of the filter is high enough that
the filter stop-band performance is not the dominant influence on adjacent channel rejection performance. This is instead
limited by the RFM95/96/97/98(W) PLL phase noise.
Note
To respect sampling criterion in the decimation chain of the receiver, the communication bit rate cannot be set at a
higher than twice the single side receiver bandwidth (BitRate < 2 x RxBw)
The programmed single side bandwidth RxBw of the channel filter is determined by the parameters RxBwMant and
RxBwExp
in RegRxBw:
RxBw = ------------------------
F
----
X
----
O
----
S
----
C
-------------------------
RxBwMant × 2
RxBwExp + 2
The following channel filter bandwidths are hence accessible in the case of a 32 MHz reference oscillator.
Table 84 Available RxBw Settings
RxBw (kHz)
RxBwMant
(binary/value)
RxBwExp
(decimal)
FSK / OOK
10b / 24
7
2.6
01b / 20
7
3.1
00b / 16
7
3.9
10b / 24
6
5.2




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