RFM22 Datasheet, PDF (131/150 Pages) –

RFM22
Register 69h. AGC Override 1
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
Reserved
agcen
lnagain
pga[3:0]
Type
R
R/W
R/W
R/W
Reset value = 00100000
Bit
Name
7:5
Reserved
4
agcen
3
lnagain
2:0
pga[3:0]
Function
Reserved.
Automatic Gain Control Enable.
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.
0 – min. gain = 5 dB 1 – max. gain = 25 dB
PGA Gain Override Value.
000: 0 dB
001: 3 dB
010: 6 dB
...
101: 24 dB max.
Register 6Ah. AGC Override 2
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name agcovpm agcslow
lnacomp[3:0]
pgath[1:0]
Type
R/W
R/W
R/W
R/W
Reset value = 00011101
Bit
Name
Function
7
agcovpm 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
6
agcslow
receiver.
The speed of the gain reduction is not affected.
LNA Gain Compensation.
5:2
lnacomp[3:0]
This bit is used for smoothing RSSI value when LNA gain is switched.
1:0
pgath[1:0] Window Comparator Reference Voltage Adjust in the PGA.
131
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