Silicon Laboratories Si4430, Manual

Page: 130 / 152

S i 4 4 3 0
130 Preliminary Rev. 0.4
Reset value = 00000011
Reset value = 00000000
Register 5Ah. VCO Current Trimming
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name
txcurboosten vcocorrov vcocorr[3:0] vcocur[1:0]
Type
R/W R/W R/W R/W
Bit Name Function
7 txcurboosten
If this is Set, then vcocur = 11 during TX Mode and VCO CAL followed by TX.
6 vcocorrov
VCO Current Correction Override.
5:2 vcocorr[3:0]
VCO Current Correction Value.
1:0 vcocur[1:0]
VCO Current Trim Value.
Register 5Bh. VCO Calibration/Override
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name
vcocalov/vcdone vcocal[6:0]
Type
R/W R/W
Bit Name Function
7 vco-
calov/vcdone
VCO Calibration Override/Done.
When vcocalov = 0 the internal VCO calibration results may be viewed by reading the
vcocal register. When vcocalov = 1 the VCO results may be overridden externally
through the SPI by writing to the vcocal register. Reading this bit gives 1 if the calibration
process has been finished.
6:0 vcocal[6:0]
VCO Calibration Results.