RFM42 Datasheet, PDF (84/110 Pages) –

RFM42/43
Register 58h. Charge Pump Current Trimming/Override
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
cpcurr[1:0]
cpcorrov
cporr[4:0]
Type
R/w
R/w
R/w
Reset value = 100xxxxx
Bit
Name
7:6
cpcurr[1:0]
5
cpcorrov
4:0
cporr[4:0]
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.
Register 59h. Divider Current Trimming/Delta-Sigma Test
Bit
Name
Type
D7
txcorboosten
R/w
D6
fbdivhc
R/w
D5
D4
d3trim[1:0]
R/w
D3
D2
d2trim[1:0]
R/w
D1
D0
d1p5trim[1:0]
R/w
Reset value = 10000000
Bit
Name
Function
If this is Set, then vcocorr (reg 5A[5:2]) = 1111 during TX Mode and VCO
7
txcorboosten
CAL followed by TX.
6
fbdivhc
Feedback (fractional) Divider High Current Enable (+5 μA).
5:4
d3trim[1:0] Divider 3 Current Trim Value.
3:2
d2trim[1:0] Divider 2 Current Trim Value.
1:0
d1p5trim[1:0] Divider 1.5 (div-by-1.5) Current Trim Value.
84
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