RFM22
Register 58h. Charge Pump Current Trimming/Override
Bit
D7
D6
cpcurr[1:0]
R/w
D5
cpcorrov
R/w
D4
D3
D2
cporr[4:0]
R/w
D1
D0
Name
Type
Reset value = 100xxxxx
Bit
Name
Function
Charge Pump Current (Gain Setting).
cpcurr[1:0]
7:6
Changing these bits will change the BW of the PLL. The default setting is
adequate for all data rates.
cpcorrov
5
Charge Pump Correction Override Enable.
Charge Pump Correction Value.
cporr[4:0]
4:0
Register 59h. Divider Current Trimming/Delta-Sigma Test
Bit
D7
txcorboosten
R/w
D6
fbdivhc
R/w
D5
D4
d3trim[1:0]
R/w
D3
D2
d2trim[1:0]
R/w
D1
d1p5trim[1:0]
R/w
D0
Name
Type
Reset value = 10000000
Bit
Name
Function
If this is Set, then vcocorr (reg 5A[5:2]) = 1111 during TX Mode and VCO
CAL followed by TX.
txcorboosten
7
fbdivhc
d3trim[1:0]
d2trim[1:0]
d1p5trim[1:0]
6
Feedback (fractional) Divider High Current Enable (+5 μA).
Divider 3 Current Trim Value.
5:4
3:2
1:0
Divider 2 Current Trim Value.
Divider 1.5 (div-by-1.5) Current Trim Value.
122
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