CC2400 Datasheet, PDF (70/84 Pages) Texas Instruments – 2.4 GHz Low-Power RF Transceiver

CC2400
FSTST0 (0x1A) - Frequency Synthesiser Test Register 0
Bit
15:14
Field Name
RXMIXBUF_CUR[1:0]
Reset R/W
2
R/W
13:12 TXMIXBUF_CUR[1:0]
2
R/W
11
VCO_ARRAY_SETTLE_LONG 0
R/W
10
VCO_ARRAY_OE
0
R/W
9:5
VCO_ARRAY_O[4:0]
16
R/W
4:0
VCO_ARRAY_RES[4:0]
-
R
Description
RX mixer buffer bias current.
0: 690uA
1: 980uA
2: 1.16mA (nominal)
3: 1.44mA
TX mixer buffer bias current.
0: 690uA
1: 980uA
2: 1.16mA (nominal)
3: 1.44mA
When '1' this control bit doubles the time allowed for VCO
settling during FS calibration.
VCO array manual override enable.
VCO array override value.
The resulting VCO array setting from the last calibration.
FSTST1 (0x1B) - Frequency Synthesiser Test Register 1
Bit
15
Field Name
RXBPF_LOCUR
Reset R/W
0
R/W
14
RXBPF_MIDCUR
0
R/W
13:10 VCO_CURRENT_REF[3:0] 4
R/W
9:4
VCO_CURRENT_K[5:0]
0
R/W
3
VC_DAC_EN
0
R/W
2:0
VC_DAC_VAL[2:0]
2
R/W
Description
Controls reference bias current to RX band-pass filters:
0: 4 uA (nominal)
1: 3 uA
Controls reference bias current to RX band-pass filters:
0: 4 uA (nominal)
1: 3.5 uA
The value of the reference current calibrated against during VCO
calibration.
VCO current calibration constant (override value current B when
FSTST2.VCO_CURRENT_OE=1).
Controls the source of the VCO control voltage in normal
operation (PAMTST.VC_IN_TEST_EN=0):
0: Loop filter (closed loop PLL)
1: VC DAC (open loop PLL)
VC DAC output value. (The value of the reference voltage used
during VCO calibration.)
SWRS042A
Page 70 of 83