RFM22
Register 55h. Calibration Control
Bit
D7
Reserved
R
D6
D5
D4
enrcfcal
R/w
D3
rccal
R/w
D2
vcocaldp
R/w
D1
vcocal
R/w
D0
skipvco
R/w
xtalstarthalf adccaldone
Name
Type
R/w
R
Reset value = x0x00100
Bit
7
Name
Reserved
Function
Reserved.
xtalstarthalf
6
If Set, the Xtal Wake Time Period is Halved.
Delta-sigma ADC Calibration Done.
adccaldone
5
Reading this bit gives 1 if the calibration process has been finished.
RC Oscillator Fine Calibration Enable.
enrcfcal
4
If this bit is set to 1 then the RC oscillator performs fine calibration in every app.
30 s.
RC Calibration Force.
If setting rccal = 1 will automatically perform a forced calibration of the 32 kHz
RC Oscillator. The RC OSC will automatically be calibrated if the
Wake-Up-Timer is enabled or if in the Wake-on-Receiver state. The calibration
takes 2 ms. The 32 kHz RC oscillator must be enabled to perform a calibration.
Setting this signal from a 0 to 1 will initiate the calibration. This bit is cleared
automatically.
rccal
3
VCO Calibration Double Precision Enable.
vcocaldp
vcocal
2
1
0
When this bit is set to 1 then the VCO calibration measures longer thus
calibrates more precisely.
VCO Calibration Force.
If in Idle Mode and pllon = 1, setting vcocal = 1 will force a one time calibration
of the synthesizer VCO. This bit is cleared automatically.
Skip VCO Calibration.
skipvco
Setting skipvco = 1 will skip the VCO calibration when going from the Idle state
to the TX or RX state.
120
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