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參數(shù)資料
| 型號： | CC113LRTKT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PQCC20 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, VQFN-20 |
| 文件頁數(shù)： | 27/75頁 |
| 文件大?。?/td> | 1454K |
| 代理商： | CC113LRTKT |
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CC113L
SWRS108A
Page 33 of 68
Figure 20: Typical RSSI Value vs. Input Power Level for Different Data Rates at 868 MHz
17.3
Carrier Sense (CS)
Carrier sense (CS) is used as a sync word
qualifier and can be asserted based on two
conditions which can be individually adjusted:
CS is asserted when the RSSI is above a
programmable absolute threshold, and de-
asserted when RSSI is below the same
threshold (with hysteresis). See more in
Section 17.3.1.
CS is asserted when the RSSI has
increased with a programmable number of
dB from one RSSI sample to the next, and
de-asserted when RSSI has decreased
with the same number of dB. This setting
is not dependent on the absolute signal
level and is thus useful to detect signals in
environments with time varying noise floor.
See more in Section 17.3.2.
Carrier sense can be used as a sync word
qualifier that requires the signal level to be
higher than the threshold for a sync word
search to be performed and is set by setting
MDMCFG2 . The carrier sense signal can be
observed on one of the GDO pins by setting
IOCFGx.GDOx_CFG=14 and in the status
register bit PKTSTATUS.CS.
17.3.1 CS Absolute Threshold
The absolute threshold related to the RSSI
value depends on the following register fields:
For given AGCCTRL2.MAX_LNA_GAIN and
settings,
the
absolute threshold can be adjusted ±7 dB in
steps
of
1
dB
using
The MAGN_TARGET setting is a compromise
between
blocker
tolerance/selectivity
and
sensitivity. The value sets the desired signal
level in the channel into the demodulator.
Increasing this value reduces the headroom
for blockers, and therefore close-in selectivity.
It is strongly recommended to use SmartRF
Studio
to
generate
the
correct
show the typical RSSI readout values at the
CS threshold at 2.4 kBaud and 250 kBaud
data rate respectively. The default reset value
for CARRIER_SENSE_ABS_THR = 0 (0 dB) has
been used. MAGN_TARGET = 3 (33 dB) and
7 (42 dB) have been used for 2.4 kBaud and
250 kBaud data rate respectively. For other
data rates, the user must generate similar
tables to find the CS absolute threshold.
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
Input Power [dBm]
RS
S
I
Rea
d
o
u
t
[d
Bm
]
1.2 kBaud
38.4 kBaud
250 kBaud
500 kBaud
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