RFM22 Datasheet, PDF (121/150 Pages) –

RFM22
Register 56h. Modem Test
Bit
Name
Type
D7
bcrfbyp
R/w
D6
slicfbyp
R/w
D5
dttype
R/w
D4
afcpol
R/w
D3
Reserved
R/w
D2
refclksel
R/w
D1
refclkinv
R/w
D0
iqswitch
R/w
Reset value = 00000000
Bit
Name
Function
7
bcrfbyp
If set, BCR phase compensation will be bypassed.
6
slicfbyp
If set, slicer phase compensation will be bypassed.
Dithering Type.
5
dttype
If low and dither enabled, we add +1/0, otherwise if high and dithering enabled,
we add ±1.
4
afcpol
AFC loop polarity selector (costumer should not touch it).
3
Reserved
Reserved.
Delta-Sigma Reference Clock Source Selection
2
refclksel
1: 10 MHz
0: PLL
1
refclkinv
Delta-Sigma Reference Clock Inversion Enable.
0
iqswitch
I&Q Channel Switch Enable.
Register 57h. Charge Pump Test
Bit
Name
Type
D7
pfdrst
R/w
D6
fbdiv_rst
R/w
D5
cpforceup
R/w
D4
cpforcedn
R/w
D3
cdonly
R/w
D2
D1
D0
cdcurr[2:0]
R/w
Reset value = 00000000
Bit
Name
Function
7
pfdrst
Direct Control to Analog.
6
fbdiv_rst
Direct Control to Analog.
5
cpforceup Charge Pump Force Up.
4
cpforcedn Charge Pump Force Down.
3
cdonly
Charge Pump DC Offset Only.
2:0
cdcurr[2:0] Charge Pump DC Current Selection.
121
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