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SWRS037B – JANUARY 2006 – REVISED MARCH 2015
Table 5-35. 0x23: FSCAL3 – Frequency Synthesizer Calibration
BIT
FIELD
TYPE
RESET
DESCRIPTION
7:6
FSCAL3[7:6]
R/W
0x02
Frequency synthesizer calibration
configuration. The value to write in this field
before calibration is given by the SmartRF
Studio software.
5:4
CHP_CURR_CAL_EN[1:0]
R/W
0x02
Disable charge pump calibration stage when
0.
3:0
FSCAL3[3:0]
R/W
0x09
Frequency synthesizer calibration result
register. Digital bit vector defining the charge
pump output current, on an exponential scale:
I_OUT = I0·2FSCAL3[3:0]/4.
Fast frequency hopping without calibration for
each hop can be done by calibrating up front
for each frequency and saving the resulting
FSCAL3, FSCAL2 and FSCAL1 register
values. Between each frequency hop,
calibration can be replaced by writing the
FSCAL3, FSCAL2 and FSCAL1 register
values corresponding to the next RF
frequency.
Table 5-36. 0x24: FSCAL2 – Frequency Synthesizer Calibration
BIT
FIELD
TYPE
RESET
DESCRIPTION
7:6
R0
Not Used.
5
VCO_CORE_H_EN
R/W
0x0
Choose high (1)/ low (0) VCO.
5:0
FSCAL2[5:0]
R/W
0x0A
Frequency synthesizer calibration result register. VCO
current calibration result and override value.
Fast frequency hopping without calibration for each
hop can be done by calibrating up front for each
frequency and saving the resulting FSCAL3, FSCAL2
and FSCAL1 register values. Between each frequency
hop, calibration can be replaced by writing the
FSCAL3, FSCAL2 and FSCAL1 register values
corresponding to the next RF frequency.
Table 5-37. 0x25: FSCAL1 – Frequency Synthesizer Calibration
BIT
FIELD
TYPE
RESET
DESCRIPTION
7:6
R0
Not Used.
5:0
FSCAL1[5:0]
R/W
0x20
Frequency synthesizer calibration result register. Capacitor
array setting for VCO coarse tuning.
Fast frequency hopping without calibration for each hop
can be done by calibrating up front for each frequency and
saving the resulting FSCAL3, FSCAL2 and FSCAL1
register values. Between each frequency hop, calibration
can be replaced by writing the FSCAL3, FSCAL2 and
FSCAL1 register values corresponding to the next RF
frequency.
Table 5-38. 0x26: FSCAL0 – Frequency Synthesizer Calibration
BIT
FIELD
TYPE
RESET
DESCRIPTION
7
Reserved
R0
Not Used.
6:0
FSCAL0[6:0]
R/W
0x0D
Frequency synthesizer calibration control. The
value to use in register field is given by the
SmartRF Studio
software.
Table 5-39. 0x29: FSTEST – Frequency Synthesizer Calibration Control
BIT
FIELD
TYPE
RESET
DESCRIPTION
7:0
FSTEST[7:0]
R/W
0x57
For test only. Do not write to this register.
48
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