Datasheet

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SX1272/73
WIRELESS, SENSING & TIMING DATASHEET
Rev. 2 - July 2014
©2014 Semtech Corporation
RegFrLsb
(0x08)
7-0 Frf(7:0) rwt 0x00
LSB of RF carrier frequency
Resolution is 61.035 Hz if F(XOSC) = 32 MHz. Default value is
0xe4c000 = 915 MHz. Register values must be modified only
when device is in SLEEP or STAND-BY mode.
register for RF
RegPaConfig
(0x09)
7 PaSelect rw 0x00
Selects PA output pin
0  RFIO pin. Output power is limited to 13 dBm.
1
 PA_BOOST pin. Output power is limited to 20 dBm
6-4 unused r - unused
3-0 OutputPower rw 0x0F
power amplifier max output power:
Pout = 2 + OutputPower(3:0) on PA_BOOST.
Pout = -1 + OutputPower(3:0) on RFIO.
RegPaRamp
(0x0A)
7-5 unused r - unused
4 LowPnTxPllOff rw 0x01
1
 Low consumption PLL is used in receive and transmit mode
0
 Low consumption PLL in receive mode, low phase noise
PLL in transmit mode.
3-0 PaRamp(3:0) 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
1010
 31 us
1011
 25 us
1100  20 us
1101
 15 us
1110
 12 us
1111
 10 us
RegOcp
(0x0B)
7-6 unused r 0x00 unused
5 OcpOn rw 0x01
Enables overload current protection (OCP) for PA:
0  OCP disabled
1
 OCP enabled
4-0 OcpTrim rw 0x0B
Trimming of OCP current:
I
max = 45+5*OcpTrim [mA] if OcpTrim <= 15 (120 mA) /
I
max = -30+10*OcpTrim [mA] if 15 < OcpTrim <= 27 (130 to
240 mA)
I
max = 240mA for higher settings
Default I
max = 100mA
Name
(Address)
Bits
Variable Name
Mode Reset
LoRa
TM
Description
f
RF
F(XOSC) Frf⋅
2
19
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