Data Sheet

Page 68
RFM69HCW
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ADVANCED COMMUNICATIONS & SENSING DATASHEET
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
RegOokPeak
(0x1B)
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 chi
p
7-6 OokAverageThreshFilt rw 10 Filter coefficients in average mode of the OOK
demodulator:
00 → f
C
≈ chip rate / 32.π 01 → f
C
≈ chip rate / 8.π
10 → f
C
≈ chip rate / 4.π 11 →f
C
≈ chip rate / 2.π
RegOokAvg
(0x1C)
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
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
RegAfcFei
(0x1E)
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
7-2 - r 000000 unused
1 RssiDone r 1 0 → RSSI is on-going
1 → RSSI sampling is finished, result available
RegRssiConfig
(0x23)
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]