Data Sheet

Page 88
RFM95/96/97/98(W)
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WIRELESS & SENSING PRELIMINARY DATASHEET
Name
(Address)
Bits
Variable Name
Mode
Default
value
FSK/OOK Description
RegFrfMsb
(0x06)
7-0 Frf(23:16) rw 0x6c MSB of the RF carrier frequency
RegFrfMid
(0x07)
7-0 Frf(15:8) rw 0x80 MSB of the RF carrier frequency
RegFrfLsb
(0x08)
7-0 Frf(7:0) rw 0x00
LSB of RF carrier frequency
Frf = F s t e p
× Frf ( 23;0 )
Default value: 434.000 MHz
The RF frequency is taken into account internally only when:
- entering FSRX/FSTX modes
- re-starting the receiver
Registers for the Transmitter
7 PaSelect rw 0x00
Selects PA output pin
0 Æ RFO pin. Maximum power of +14 dBm
1 Æ PA_BOOST pin. Maximum power of +20 dBm
6-4 MaxPower rw 0x04 Select max output power: Pmax=10.8+0.6*MaxPower [dBm]
RegPaConfig
(0x09)
3-0 OutputPower rw 0x0f
Pout=Pmax-(15-OutputPower) if PaSelect = 0 (RFO pins)
Pout=17-(15-OutputPower) if PaSelect = 1 (PA_BOOST pin)
7 unused r 0x00 unused
6-5 ModulationShaping rw 0x00
Data shaping:
In FSK:
00 Æ no shaping
01 Æ gaussian filter BT = 1.0
10 Æ gaussian filter BT = 0.5
11 Æ gaussian filter BT = 0.3
In OOK:
00 Æ no shaping
01 Æ filtering with fcutoff = bit_rate
10 Æ filtering with fcutoff = 2*bit_rate (for bit_rate < 125 kb/s)
11 Æ reserved
4 reserved rw 0x00 reserved
RegPaRamp
(0x0A)
3-0 PaRamp rw 0x09
Rise/Fall time of ramp up/down in FSK
0000 Æ 3.4 ms
0001 Æ 2 ms
0010 Æ 1 ms
0011 Æ 500 us
0100 Æ 250 us
0101 Æ 125 us
0110 Æ 100 us
0111 Æ 62 us
1000 Æ 50 us
1001 Æ 40 us (d)
1010 Æ 31 us
1011 Æ 25 us
1100 Æ 20 us
1101 Æ 15 us
1110 Æ 12 us
1111 Æ 10 us