Data Sheet

LJ1269HC
Rev1.0 Page 66 Web: www.ljelect.com
RegOokPeak
(0x1B)
7-6
OokThreshType
rw
01
Selects type of threshold in the OOK data slicer:
00 → fixed 10 → average
01 → peak 11 → reserved
5-3
OokPeakTheshStep
rw
000
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 → fC ≈ chip rate / 32.π 01 → fC ≈ chip rate / 8.π
10 → fC ≈ chip rate / 4.π 11 →fC ≈ chip rate / 2.π
5-0
-
r
000000
unused
RegOokFix
(0x1D)
7-0
OokFixedThresh
rw
0110
(6dB)
Fixed threshold value (in dB) in the OOK demodulator.
Used when OokThresType = 00
RegAfcFei
(0x1E)
7
-
r
0
unused
6
FeiDone
r
0
0 → FEI is on-going
1 → FEI finished
5
FeiStart
w
0
Triggers a FEI measurement when set. Always reads 0.
4
AfcDone
r
1
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
AfcClear
w
0
Clears the AfcValue if set in Rx mode. Always reads 0
0
AfcStart
w
0
Triggers an AFC when set. Always reads 0.
RegAfcMsb
(0x1F)
7-0
AfcValue(15:8)
r
0x00
MSB of the AfcValue, 2‟s complement format
RegAfcLsb
(0x20)
7-0
AfcValue(7:0)
r
0x00
LSB of the AfcValue, 2‟s complement format
Frequency correction = AfcValue x Fstep
RegFeiMsb
(0x21)
7-0
FeiValue(15:8)
r
-
MSB of the measured frequency offset, 2‟s complement
RegFeiLsb
(0x22)
7-0
FeiValue(7:0)
r
-
LSB of the measured frequency offset, 2‟s complement
Frequency error = FeiValue x Fstep
RegRssiConfig
(0x23)
7-2
-
r
000000
unused
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]
Sub GHz FSK/OOK Transceiver Module DATASHEET