CC2550_06 Datasheet, PDF (45/55 Pages) Texas Instruments – Single Chip Low Cost Low Power RF Transmitter

CC2550
0x23: FSCAL3 – Frequency synthesizer calibration
Bit Field Name
Reset R/W Description
7:6 FSCAL3[7:6]
5:4 CHP_CURR_CAL_EN[1:0]
3:0 FSCAL3[3:0]
2 (10) R/W Frequency synthesizer calibration configuration. The value to write
in this register before calibration is given by the SmartRF^® Studio
software.
2 (10) R/W Disable charge pump calibration stage when 0
9
R/W Frequency synthesizer calibration result register.
(1001)
Fast frequency hopping without calibration for each hop can be
done by calibrating upfront 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.
Bit Field Name
7:6 Reserved
5:0 FSCAL2[5:0]
0x24: FSCAL2 – Frequency synthesizer calibration
Reset R/W Description
R0
10
R/W Frequency synthesizer calibration result register.
(0x0A)
Fast frequency hopping without calibration for each hop can be
done by calibrating upfront 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.
Bit Field Name
7:6 Reserved
5:0 FSCAL1[5:0]
0x25: FSCAL1 – Frequency synthesizer calibration
Reset R/W Description
R0
32
R/W Frequency synthesizer calibration result register.
(0x20)
Fast frequency hopping without calibration for each hop can be
done by calibrating upfront 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.
Bit Field Name
7 Reserved
6:5 Reserved
4:0 FSCAL0[4:0]
0x26: FSCAL0 – Frequency synthesizer calibration
Reset R/W Description
0 (00)
13
(0x0D)
R0
R0
R/W
Defined on the transceiver version
Frequency synthesizer calibration control. The value to use in
register field is given by the SmartRF^® Studio software.
0x29: FSTEST – Frequency synthesizer calibration control
Bit Field Name
Reset R/W Description
7:0 FSTEST[7:0]
87
R/W For test only. Do not write to this register.
(0x57)
PRELIMINARY Data Sheet (Rev.1.2) SWRS039A
Page 45 of 54