SX1231
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
7-0 BitRate(7:0)
rw
0x0b LSB of Bit Rate (Chip Rate if Manchester encoding is
enabled)
RegBitrateLsb
(0x04)
FXOSC
BitRate(15,0)
----------------------------------
BitRate =
Default value: 4.8 kb/s
unused
7-6
-
r
00
RegFdevMsb
(0x05)
5-0 Fdev(13:8)
7-0 Fdev(7:0)
rw
rw
000000 MSB of the frequency deviation
0x52 LSB of the frequency deviation
RegFdevLsb
(0x06)
Fdev = Fstep × Fdev(15,0)
Default value: 5 kHz
7-0 Frf(23:16)
7-0 Frf(15:8)
7-0 Frf(7:0)
rw
rw
rw
0xe4 MSB of the RF carrier frequency
RegFrfMsb
(0x07)
0xc0 Middle byte of the RF carrier frequency
RegFrfMid
(0x08)
0x00 LSB of the RF carrier frequency
RegFrfLsb
(0x09)
Frf = Fstep × Frf(23;0)
Default value: Frf = 915 MHz (32 MHz XO)
7
6
RcCalStart
RcCalDone
w
r
0
1
Triggers the calibration of the RC oscillator when set.
Always reads 0. RC calibration must be triggered in
Standby mode. See calibration procedure in section 7.3
RegOsc1
(0x0A)
0 Æ RC calibration in progress
1 Æ RC calibration is over
5-0
7-0
-
-
r
r
000001 unused
0x40 unused
RegOsc2
(0x0B)
7-5
4
-
r
000
-
unused
RegLowBat
(0x0C)
LowBatMonitor
rw
Real-time (not latched) output of the Low Battery detector,
when enabled.
3
LowBatOn
rw
rw
0
Low Battery detector enable signal
0 Æ LowBat off
1 Æ LowBat on
2-0 LowBatTrim
010
Trimming of the LowBat threshold:
000 Æ 1.695 V
001 Æ 1.764 V
010 Æ 1.835 V
011 Æ 1.905 V
100 Æ 1.976 V
101 Æ 2.045 V
110 Æ 2.116 V
111 Æ 2.185 V
Rev 2 - Nov 2009
Page 61
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SEMTECH [ SEMTECH CORPORATION ]
