Datasheet

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SX1272/73
WIRELESS, SENSING & TIMING DATASHEET
Rev. 2 - July 2014
©2014 Semtech Corporation
RegFdevMsb
(0x04)
7-6 unused r 0x00 unused
5-0 Fdev(13:8) rw 0x00 MSB of the frequency deviation
RegFdevLsb
(0x05)
7-0 Fdev(7:0) rw 0x52
LSB of the frequency deviation
Default value: 5 kHz
RegFrfMsb
(0x06)
7-0 Frf(23:16) rw 0xE4 MSB of the RF carrier frequency
RegFrfMid
(0x07)
7-0 Frf(15:8) rw 0xC0 MSB of the RF carrier frequency
RegFrfLsb
(0x08)
7-0 Frf(7:0) rw 0x00
LSB of RF carrier frequency
Default value: 915.000 MHz
The RF frequency is taken into account internally only when:
- entering FSRX/FSTX modes
- re-starting the receiver
Registers for the Transmitter
RegPaConfig
(0x09)
7 PaSelect rw 0x00
Selects PA output pin
0  RFO pin. Maximum power of +13 dBm
1
 PA_BOOST pin. Maximum power of +20 dBm
6-4 unused r 0x00 unused
3-0 OutputPower rw 0x0F
Output power setting, with 1dB steps
Pout = 2 + OutputPower [dBm], on PA_BOOST pin
Pout = -1 + OutputPower [dBm], on RFO pin
RegPaRamp
(0x0A)
7-5 unused r - unused
4 LowPnTxPllOff rw 0x01
Select a higher power, lower phase noise PLL only when the
transmitter is used:
0
 Standard PLL used in Rx mode, Lower PN PLL in Tx
1
 Standard PLL used in both Tx and Rx modes
3-0 PaRamp rw 0x09
Rise/Fall time of ramp up/down in FSK
0000
 3.4 ms
0001
 2 ms
0010  1 ms
0011
 500 us
0100
 250 us
0101
 125 us
0110
 100 us
0111
 62 us
1000
 50 us
1001  40 us (d)
1010
 31 us
1011
 25 us
1100
 20 us
1101
 15 us
1110
 12 us
1111
 10 us
Name
(Address)
Bits
Variable Name
Mode
Default
value
FSK/OOK Description
Fdev Fstep Fdev 15 0(,)×=
Frf Fstep Frf 23 0;()×=