RFM22
Register 69h. AGC Override 1
Bit
D7
D6
D5
agcen
R/W
D4
lnagain
R/W
D3
D2
D1
D0
Reserved
R
pga[3:0]
R/W
Name
Type
Reset value = 00100000
Bit
Name
Function
Reserved
7:5
Reserved.
Automatic Gain Control Enable.
agcen
4
3
When this bit is set then the result of the control can be read out from bits [4:0],
otherwise the gain can be controlled manually by writing into bits [4:0].
LNA Gain Select.
lnagain
0 – min. gain = 5 dB
1 – max. gain = 25 dB
PGA Gain Override Value.
000:
001:
010:
...
0 dB
3 dB
6 dB
pga[3:0]
2:0
101:
24 dB max.
Register 6Ah. AGC Override 2
Bit
D7
agcovpm
R/W
D6
D5
D4
lnacomp[3:0]
R/W
D3
D2
D1
D0
agcslow
R/W
pgath[1:0]
R/W
Name
Type
Reset value = 00011101
Bit
Name
Function
agcovpm
agcslow
7
If set, AGC will ignore the Preamble Detection.
AGC Slow Gain Increase Enable.
When this bit is set then the AGC loop will slow down the gain increase in the
receiver.
6
The speed of the gain reduction is not affected.
LNA Gain Compensation.
lnacomp[3:0]
pgath[1:0]
5:2
1:0
This bit is used for smoothing RSSI value when LNA gain is switched.
Window Comparator Reference Voltage Adjust in the PGA.
131
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