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SX1231
WIRELESS & SENSING PRODUCTS
DATASHEET
RegOokPeak
(0x1B)
7-6
5-3
OokThreshType
OokPeakTheshStep
rw
rw
01
000
Selects type of threshold in the OOK data slicer:
00 ? fixed 10 ? average
01 ? peak 11 ? reserved
Size of each decrement of the RSSI threshold in the OOK
demodulator:
000 ? 0.5 dB 001 ? 1.0 dB
010 ? 1.5 dB 011 ? 2.0 dB
100 ? 3.0 dB
101 ? 4.0 dB
110 ? 5.0 dB 111 ? 6.0 dB
2-0
OokPeakThreshDec
rw
000
Period of decrement of the RSSI threshold in the OOK
demodulator:
000 ? once per chip 001 ? once every 2 chips
010 ? once every 4 chips 011 ? once every 8 chips
100 ? twice in each chip
101 ? 4 times in each chip
110 ? 8 times in each chip 111 ? 16 times in each chip
RegOokAvg
(0x1C)
7-6
OokAverageThreshFilt
rw
10
Filter coefficients in average mode of the OOK
demodulator:
00 ? f C ≈ chip rate / 32. π
10 ? f C ≈ chip rate / 4. π
01 ? f C ≈ chip rate / 8. π
11 ? f C ≈ chip rate / 2. π
5-0
-
r
000000 unused
RegOokFix
(0x1D)
RegAfcFei
(0x1E)
7-0
7
6
OokFixedThresh
-
FeiDone
rw
r
r
0110
(6dB)
0
0
Fixed threshold value (in dB) in the OOK demodulator.
Used when OokThresType = 00
unused
0 ? FEI is on-going
1 ? FEI finished
5
4
FeiStart
AfcDone
w
r
0
1
Triggers a FEI measurement when set. Always reads 0.
0 ? AFC is on-going
1 ? AFC has finished
3
AfcAutoclearOn
rw
0
Only valid if AfcAutoOn is set
0 ? AFC register is not cleared before a new AFC phase
1 ? AFC register is cleared before a new AFC phase
2
AfcAutoOn
rw
0
0 ? AFC is performed each time AfcStart is set
1 ? AFC is performed each time Rx mode is entered
1
0
AfcClear
AfcStart
w
w
0
0
Clears the AfcValue if set in Rx mode. Always reads 0
Triggers an AFC when set. Always reads 0.
RegAfcMsb
7-0
AfcValue(15:8)
r
0x00
MSB of the AfcValue, 2’s complement format
(0x1F)
RegAfcLsb
(0x20)
RegFeiMsb
7-0
7-0
AfcValue(7:0)
FeiValue(15:8)
r
r
0x00
-
LSB of the AfcValue, 2’s complement format
Frequency correction = AfcValue x Fstep
MSB of the measured frequency offset, 2’s complement
(0x21)
RegFeiLsb
(0x22)
7-0
FeiValue(7:0)
r
-
LSB of the measured frequency offset, 2’s complement
Frequency error = FeiValue x Fstep
RegRssiConfig
7-2
-
r
000000 unused
(0x23)
1
RssiDone
r
1
0 ? RSSI is on-going
1 ? RSSI sampling is finished, result available
0
RssiStart
w
0
Trigger a RSSI measurement when set. Always reads 0.
RegRssiValue
(0x24)
7-0
RssiValue
r
0xFF
Absolute value of the RSSI in dBm, 0.5dB steps.
RSSI = - RssiValue/2 [dBm]
Rev. 7 - June 2013
Page 70
www.semtech.com
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