SX1231-31SKB915 Semtech, SX1231-31SKB915 Datasheet - Page 66

• 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
RegOokPeak
(0x1B)
RegOokAvg
(0x1C)
RegOokFix
(0x1D)
RegAfcFei
(0x1E)
RegAfcMsb
(0x1F)
RegAfcLsb
(0x20)
RegFeiMsb
(0x21)
RegFeiLsb
(0x22)
RegRssiConfig
(0x23)
RegRssiValue
(0x24)
7-6
5-3
2-0
7-6
5-0
7-0
7-0
7-0
7-0
7-0
7-2
7-0
7
6
5
4
3
2
1
0
1
0
OokThreshType
OokPeakTheshStep
OokPeakThreshDec
OokAverageThreshFilt
-
OokFixedThresh
-
FeiDone
FeiStart
AfcDone
AfcAutoclearOn
AfcAutoOn
AfcClear
AfcStart
AfcValue(15:8)
AfcValue(7:0)
FeiValue(15:8)
FeiValue(7:0)
-
RssiDone
RssiStart
RssiValue
rw
rw
rw
rw
rw
rw
rw
w
w
w
w
r
r
r
r
r
r
r
r
r
r
r
Page 66
000000 unused
000000 unused
(6dB)
0xFF
0110
0x00
0x00
000
000
01
10
0
0
0
1
0
0
0
0
1
0
-
-
Selects type of threshold in the OOK data slicer:
00
01
Size of each decrement of the RSSI threshold in the OOK
demodulator:
000
010
100
110
Period of decrement of the RSSI threshold in the OOK
demodulator:
000
010
100
110
Filter coefficients in average mode of the OOK
demodulator:
00
10
Fixed threshold value (in dB) in the OOK demodulator.
Used when OokThresType = 00
unused
0
1
Triggers a FEI measurement when set. Always reads 0.
0
1
Only valid if AfcAutoOn is set
0
1
0
1
Clears the AfcValue if set in Rx mode. Always reads 0
Triggers an AFC when set. Always reads 0.
MSB of the AfcValue, 2’s complement format
LSB of the AfcValue, 2’s complement format
Frequency correction = AfcValue x Fstep
MSB of the measured frequency offset, 2’s complement
LSB of the measured frequency offset, 2’s complement
Frequency error = FeiValue x Fstep
0
1
Trigger a RSSI measurement when set. Always reads 0.
Absolute value of the RSSI in dBm, 0.5dB steps.
RSSI = - RssiValue/2 [dBm]
FEI is on-going
FEI finished
AFC is on-going
AFC has finished
AFC register is not cleared before a new AFC phase
AFC register is cleared before a new AFC phase
AFC is performed each time AfcStart is set
AFC is performed each time Rx mode is entered
RSSI is on-going
RSSI sampling is finished, result available
fixed
peak
f
f
C
C
8 times in each chip
0.5 dB
1.5 dB
3.0 dB
once per chip
once every 4 chips
twice in each chip
5.0 dB
≈ chip rate / 32.π
≈ chip rate / 4.π
10
11
111
001
011
101
average
reserved
2.0 dB
1.0 dB
4.0 dB
6.0 dB
101
111
001
011
01
11
f
C
f
16 times in each chip
4 times in each chip
once every 2 chips
once every 8 chips
C
DATASHEET
≈ chip rate / 2.π
www.semtech.com
SX1231
≈ chip rate / 8.π