CC2400_07 Datasheet, PDF (60/83 Pages) Texas Instruments – 2.4 GHz Low-Power RF Transceiver

CC2400
Bit
0
Field Name
XOSC16M_EN
Reset R/W
0
R/W
Description
Forces the 16 MHz main crystal oscillator and the global bias on.
These modules can also be turned on in other ways.
FSCTRL (0x01) - Frequency Synthesiser Control and Status
Bit
15:6
5:4
3
2
1
0
Field Name
-
LOCK_THRESHOLD[1:0]
CAL_DONE
CAL_RUNNING
LOCK_LENGTH
LOCK_STATUS
Reset R/W
0
W0
1
R/W
0
R
0
R
0
R/W
0
R
Description
Reserved, write as 0.
Number of consecutive reference clock periods with successful
sync windows required to indicate lock:
0: 64
1: 128
2: 256
3: 512
Calibration has been performed since the last time the FS was
turned on.
Calibration status, '1' when calibration in progress.
LOCK_WINDOW pulse width:
0: 2 CLK_PRE periods
1: 4 CLK_PRE periods
'1' when PLL is in lock, otherwise '0'.
FSDIV (0x02) - Frequency Synthesiser Frequency Division Control
Bit
15:12
11:10
Field Name
-
FREQ[11:10]
9:0
FREQ[9:0]
Reset R/W
0
W0
2
R
353
R/W
Description
Reserved, write as 0.
Read only.
Directly gives the right frequency in MHz when reading/writing
FREQ[11:0].
Frequency control word.
f_c = FREQ[11: 0]= 2048 + FREQ[9 : 0] ^[MHz]
where fc is the channel centre frequency. See page 47 for a
description of how to program the channel for tansmit and
receive modes respectively.
Reading/writing FREQ[11:0] gives the right frequency in MHz.
The default value corresponds to fc=2401MHz.
MDMCTRL (0x03) - Modem Control and Status
Bit
15:13
12:7
Field Name
-
MOD_OFFSET[5:0]
Reset R/W
0
W0
0
R/W
Description
Reserved, write as 0.
Modulator/Demodulator centre frequency in 15.625 kHz steps
(for the receiver the steps are relative to 1 MHz, for the
transmitter the steps are relative to 0MHz when
MDMTST0.TX_1MHZ_OFFSET_N=1).
Two's complement signed value. I.e. MOD_OFFSET=0x1F Î
centre frequency=1.48 MHz; MOD_OFFSET=0x20 Î centre
SWRS042A
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