SX1231 SEMTECH [Semtech Corporation], SX1231 Datasheet - Page 61

• Manufacturer Part Number: SX1231
• Description: Low Power Integrated UHF Transceiver
• Manufacturer: SEMTECH [Semtech Corporation]

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