RFM42/43
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
7:6
5
Name
cpcurr[1:0]
cpcorrov
Function
Charge Pump Current (Gain Setting).
Changing these bits will change the BW of the PLL. The default setting is
adequate for all data rates.
Charge Pump Correction Override Enable.
Charge Pump Correction Value.
During read, you read what the Charge Pump sees. If cpcorrov = 1, then the
value you write will go to the Charge Pump, and will also be the value you read.
By default, cpcorr[4:0] wakes up as all Zeros.
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.
84
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