MRF39RA Datasheet, PDF (47/72 Pages) Microchip Technology – Low-Power, Integrated UHF Receiver

MRF39RA
TABLE 5-3:
Name
(Address)
RegAfcBw
(0x1A)
RegOokPeak
(0x1B)
RegOokAvg
(0x1C)
RegOokFix
(0x1D)
RECEIVER REGISTERS (CONTINUED)
Bits
Variable Name
Mode
Default
Value
Description
7-5 DccFreqAfc
4-3 RxBwMantAfc
2-0 RxBwExpAfc
7-6 OokThreshType
5-3 OokPeakTheshStep
2-0 OokPeakThreshDec
7-6 OokAverageThreshFilt
5-0 —
7-0 OokFixedThresh
rw
100 DccFreq parameter used during the AFC
rw
01 RxBwMant parameter used during the
AFC
rw
011* RxBwExp parameter used during the
AFC
rw
01 Selects type of threshold in the OOK
data slicer:
00  Fixed
10  Average
01  Peak
11  Reserved
rw
000 Size of each decrement of the RSSI
threshold in the OOK demodulator:
000  0.5 dB
010  1.5 dB
100  3.0 dB
110  5.0 dB
001  1.0 dB
011  2.0 dB
101  4.0 dB
111  6.0 dB
rw
000 Period of decrement of the RSSI
threshold in the OOK demodulator:
000  Once per chip
001  Once every two chips
010  Once every four chips
011  Once every eight chips
100  Twice in each chip
101  Four times in each chip
110  Eight times in each chip
111  16 times in each chip
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
r 000000 Unused
rw 0110 Fixed threshold value (in dB) in the OOK
(6dB) demodulator.
Used when OokThresType = 00
 2015 Microchip Technology Inc.
DS40001778B-page 47