SX1276 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SX1276' PDF : 132 Pages View PDF
WIRELESS, SENSING & TIMING
SX1276/77/78/79
DATASHEET
Name
(Address)
Bits
RegFrfMsb
(0x06)
7-0
RegFrfMid
(0x07)
7-0
RegFrfLsb
(0x08)
7-0
7
RegPaConfig
(0x09)
6-4
3-0
7
6-5
4
RegPaRamp
(0x0A)
3-0
Variable Name
Frf(23:16)
Mode
Default
value
FSK/OOK Description
rw 0x6c MSB of the RF carrier frequency
Frf(15:8)
rw 0x80 MSB of the RF carrier frequency
Frf(7:0)
PaSelect
MaxPower
OutputPower
unused
ModulationShaping
reserved
PaRamp
LSB of RF carrier frequency
Frf = Fstep × Frf(23;0)
rw 0x00 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
Selects PA output pin
rw 0x00 0 RFO pin. Maximum power of +14 dBm
1 PA_BOOST pin. Maximum power of +20 dBm
rw 0x04 Select max output power: Pmax=10.8+0.6*MaxPower [dBm]
rw
0x0f
Pout=Pmax-(15-OutputPower) if PaSelect = 0 (RFO pins)
Pout=17-(15-OutputPower) if PaSelect = 1 (PA_BOOST pin)
r 0x00 unused
Data shaping:
In FSK:
00 no shaping
01 Gaussian filter BT = 1.0
10 Gaussian filter BT = 0.5
rw 0x00 11 Gaussian filter BT = 0.3
In OOK:
00 no shaping
01 filtering with fcutoff = bit_rate
10 filtering with fcutoff = 2*bit_rate (for bit_rate < 125 kb/s)
11 reserved
rw 0x00 reserved
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
rw 0x09 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
Rev. 4 - March 2015
©2015 Semtech Corporation
Page 94
www.semtech.com
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