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