CC2500RGPR Datasheet, PDF (79/99 Pages) Texas Instruments – Low-Cost Low-Power 2.4 GHz RF Transceiver

CC2500
0x22: FREND0 – Front End TX configuration
Bit Field Name
Reset R/W Description
7:6 Reserved
5:4 LODIV_BUF_CURRENT_TX[1:0]
3 Reserved
2:0 PA_POWER[2:0]
R0
1 (01) R/W
R0
0 (000) R/W
Adjusts current TX LO buffer (input to PA). The value to use in
this field is given by the SmartRF^ Studio software [5].
Selects PA power setting. This value is an index to the
PATABLE. In OOK mode, this selects the PATABLE index to
use when transmitting a ‘1’. PATABLE index zero is used in
OOK when transmitting a ‘0’.
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
2 (10) R/W
9
R/W
(1001)
Frequency synthesizer calibration configuration. The value to write in
this register before calibration is given by the SmartRF^ Studio
software [5].
Disable charge pump calibration stage when 0
Frequency synthesizer calibration result register. Digital bit vector
defining the charge pump output current, on an exponential scale:
IOUT=I0·2^{FSCAL3[3:0]/4}
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.
0x24: FSCAL2 – Frequency Synthesizer Calibration
Bit Field Name
Reset R/W Description
7:6 Reserved
5 VCO_CORE_H_EN
4:0 FSCAL2[4:0]
R0
0
R/W
10
R/W
(0x0A)
Choose high (1) / low (0) VCO
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 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.
SWRS040C
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