SX1231-31SKB915 Semtech, SX1231-31SKB915 Datasheet - Page 62

• Manufacturer Part Number: SX1231-31SKB915
• Description: TVS
• Manufacturer: Semtech

Specifications of SX1231-31SKB915

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Rev 3 - April 2010
ADVANCED COMMUNICATIONS & SENSING
RegBitrateLsb
(0x04)
RegFdevMsb
(0x05)
RegFdevLsb
(0x06)
RegFrfMsb
(0x07)
RegFrfMid
(0x08)
RegFrfLsb
(0x09)
RegOsc1
(0x0A)
RegAfcCtrl
(0x0B)
RegLowBat
(0x0C)
7-0
7-6
5-0
7-0
7-0
7-0
7-0
5-0
7-6
4-0
7-5
2-0
7
6
5
4
3
BitRate(7:0)
-
Fdev(13:8)
Fdev(7:0)
Frf(23:16)
Frf(15:8)
Frf(7:0)
RcCalStart
RcCalDone
-
-
AfcLowBetaOn
-
-
LowBatMonitor
LowBatOn
LowBatTrim
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
w
r
r
r
r
r
r
Page 62
000000 MSB of the frequency deviation
000001 unused
00000 unused
0x0b
0x52
0xe4
0xc0
0x00
010
000
00
00
0
1
0
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.
0
1
unused
Improved AFC routine for signals with modulation index
lower than 2. Refer to section 3.5.15 for details
0
1
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
Standard AFC routine
Improved AFC routine
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