CC2400_07 Datasheet, PDF (71/83 Pages) Texas Instruments – 2.4 GHz Low-Power RF Transceiver

CC2400
FSTST2 (0x1C) - Frequency Synthesiser Test Register 2
Bit
Field Name
Reset R/W
15
-
0
W0
14:13 VCO_CURCAL_SPEED[1:0] 0
R/W
12
VCO_CURRENT_OE
0
R/W
11:6
VCO_CURRENT_O[5:0]
24
R/W
5:0
VCO_CURRENT_RES[5:0] -
R
Description
Reserved, write as 0.
VCO current calibration speed:
0: Normal
1: Undefined
2: Half speed
3: Undefined.
VCO current manual override enable.
VCO current override value (current A).
The resulting VCO current setting from last calibration.
FSTST3 (0x1D) - Frequency Synthesiser Test Register 3
Bit
15:14
13
12
Field Name
-
CHP_TEST_UP
CHP_TEST_DN
11
CHP_DISABLE
10
PD_DELAY
Reset R/W
0
W0
0
R/W
0
R/W
0
R/W
0
R/W
9:8
CHP_STEP_PERIOD[1:0] 2
R/W
7:4
STOP_CHP_CURRENT[3:0] 13
R/W
3:0
START_CHP_CURRENT
[3:0]
13
R/W
Description
Reserved, write as 0.
When CHP_DISABLE=1 forces the CHP to output "up" current.
When CHP_DISABLE=1 forces the CHP to output "down"
current.
Set to disable charge pump during VCO calibration.
Selects short or long reset delay in phase detector:
0: Short reset delay
1: Long reset delay
The charge pump current value step period:
0: 0.25 us
1: 0.5 us
2: 1 us
3: 4 us
The charge pump current to stop at after the current is stepped
down from START_CHP_CURRENT after VCO calibration is
complete. The current is stepped down periodically with intervals
as defined in CHP_STEP_PERIOD.
The charge pump current to start with after VCO calibration is
complete. The current is then stepped down periodically to the
value STOP_CHP_CURRENT with intervals as defined in
CHP_STEP_PERIOD.
SWRS042A
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