Datasheet

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SX1272/73
WIRELESS, SENSING & TIMING DATASHEET
Rev. 2 - July 2014
©2014 Semtech Corporation
RegOcp
(0x0B)
7-6 unused r 0x00 unused
5 OcpOn rw 0x01
Enables overload current protection (OCP) for the 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
Registers for the Receiver
RegLna
(0x0C)
7-5 LnaGain rw 0x01
LNA gain setting:
000  reserved
001  G1 = highest gain
010  G2 = highest gain – 6 dB
011  G3 = highest gain – 12 dB
100  G4 = highest gain – 24 dB
101  G5 = highest gain – 36 dB
110  G6 = highest gain – 48 dB
111  reserved
Note:
Reading this address always returns the current LNA gain (which
may be different from what had been previously selected if AGC
is enabled.
4-2 - r 0x00 unused
1-0 LnaBoost rw 0x00
Improves the system Noise Figure at the expense of Rx current
consumption:
00
 Default setting, meeting the specification
11
 Improved sensitivity
RegRxConfig
(0x0D)
7 RestartRxOnCollision rw 0x00
Turns on the mechanism restarting the receiver automatically if it
gets saturated or a packet collision is detected
0
 No automatic Restart
1
 Automatic restart On
6 RestartRxWithoutPllLock wt 0x00
Triggers a manual Restart of the Receiver chain when set to 1.
Use this bit when there is no frequency change,
RestartRxWithPllLock otherwise.
5 RestartRxWithPllLock wt 0x00
Triggers a manual Restart of the Receiver chain when set to 1.
Use this bit when there is a frequency change, requiring some
time for the PLL to re-lock.
4 AfcAutoOn rw 0x00
0
 No AFC performed at receiver startup
1
 AFC is performed at each receiver startup
3 AgcAutoOn rw 0x01
0
 LNA gain forced by the LnaGain Setting
1
 LNA gain is controlled by the AGC
2-0 RxTrigger rw
0x06
*
Selects the event triggering AGC and/or AFC at receiver startup.
See Table Table 23 for a description.
Name
(Address)
Bits
Variable Name
Mode
Default
value
FSK/OOK Description