CC112X/CC1175
SWRU295C
Page 87 of 108
FREQOFF_CFG - Frequency Offset Correction Configuration
Bit no. Name
Reset
R/W Description
7:6
FREQOFF_CFG_NOT_USED
0x00
R
5
FOC_EN
0x01
R/W Frequency Offset Correction Enable
0
Frequency offset correction disabled
1
Frequency offset correction enabled
4:3
FOC_CFG
0x00
R/W Frequency Offset Correction Configuration.
FOC_CFG != 00b
enables more narrow
RX filter BW than
FOC_CFG = 00b
but needs longer settle time. When FOC in FS is
enabled, the device automatically switch to 'FOC after channel filter' when a sync
word is detected
00
FOC after channel filter (typical 0 - 1 preamble bytes for settling)
01
FOC in FS enabled. Loop gain factor is 1/128 (typical 2 - 4 preamble bytes
for settling)
10
FOC in FS enabled. Loop gain factor is 1/256 (typical 2 - 4 preamble bytes
for settling)
11
FOC in FS enabled. Loop gain factor is 1/512 (typical 2 - 4 preamble bytes
for settling)
2
FOC_LIMIT
0x00
R/W FOC Limit. This is the maximum frequency offset correction in the frequency
synthesizer. Only valid when
FOC_CFG != 00b
0
RX filter bandwidth/4
1
RX filter bandwidth/8
1:0
FOC_KI_FACTOR
0x00
R/W Frequency Offset Correction.
MDMCFG0.TRANSPARENT_MODE_EN | FOC_KI_FACTOR
000
Frequency offset compensation disabled after sync detected (typical
setting for short packets)
001
Frequency offset compensation during packet reception with loop gain
factor = 1/32 (fast loop)
010
Frequency offset compensation during packet reception with loop gain
factor = 1/64
011
Frequency offset compensation during packet reception with loop gain
factor = 1/128 (slow loop)
100
Frequency offset compensation with Loop Gain factor 1/128 (fast loop)
101
Frequency offset compensation with Loop Gain factor 1/256
110
Frequency offset compensation with Loop Gain factor 1/512
111
Frequency offset compensation with Loop Gain factor 1/1024 (slow loop)