RFM95 Datasheet, PDF (41/121 Pages) List of Unclassifed Manufacturers – Low Power Long Range Transceiver Module

WIRELESS & SENSING
RFM95/96/97/98(W)
PRELIMINARY
DATASHEET
Table 63 DIO Mapping LoRa^TM Mode
Operating
Mode
ALL
DIOx
Mapping
00
01
10
11
DIO5
ModeReady
ClkOut
ClkOut
-
DIO4
CadDetected
PllLock
PllLock
-
DIO3
CadDone
ValidHeader
PayloadCrcError
-
DIO2
DIO1
FhssChangeChannel
FhssChangeChannel
FhssChangeChannel
-
RxTimeout
FhssChangeChannel
CadDetected
-
DIO0
RxDone
TxDone
CadDone
-
4.2. FSK/OOK Modem
4.2.1. Bit Rate Setting
The bitrate setting is referenced to the crystal oscillator and provides a precise means of setting the bit rate (or equivalently
chip) rate of the radio. In continuous transmit mode (Section 3.2.2) the data stream to be transmitted can be input directly
to the modulator via pin 9 (DIO2/DATA) in an asynchronous manner, unless Gaussian filtering is used, in which case the
DCLK signal on pin 10 (DIO1/DCLK) is used to synchronize the data stream. See section 4.2.2.3 for details on the
Gaussian filter.
In Packet mode or in Continuous mode with Gaussian filtering enabled, the Bit Rate (BR) is controlled by bits Bitrate in
RegBitrateMsb and RegBitrateLsb
Bi tR ate
=
---------------------------^F----^X----^O-----^S---^C-----------------------------
BitRate(15,0) + -----ⁱ--^t--^r--^a----^t--^e---^F----^r--^a----^c-
16
Note: BitrateFrac bits have no effect (i.e may be considered equal to 0) in OOK modulation mode.
The quantity BitrateFrac is hence designed to allow very high precision (max. 250 ppm programing resolution) for any
bitrate in the programmable range. Table 64 below shows a range of standard bitrates and the accuracy to within which
they may be reached.
Page 41
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