參數(shù)資料
型號(hào)： 1200
廠商： TEXAS INSTRUMENTS INC
元件分類： 無(wú)繩電話/電話
英文描述： TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC20
封裝： 4 X 4 MM, ROHS COMPLIANT, QLP-20
文件頁(yè)數(shù)： 21/70頁(yè)
文件大?。?/td> 841K
代理商： 1200
Chipcon
SmartRF CC1100
Chipcon AS
SmartRF
CC1100 Preliminary Data Sheet (rev. 1.0) 2005-04-25
Page 28 of 68
By setting the value to zero, the preamble
quality qualifier of the synch word is disabled.
A “Preamble Quality reached” flag can also be
observed on one of the GDO pins and in the
status register bit PKTSTATUS.PQT_REACHED.
This flag asserts when the received signal
exceeds the PQT.
25.2
RSSI
The RSSI value is an estimate of the signal
level in the current channel. This value is
based on the current gain setting in the RX
chain and the measured signal level in the
channel.
In RX mode, the RSSI value can be read
continuously from the RSSI status register,
until the demodulator detects a sync word
(when sync word detection is enabled). At that
point, the RSSI readout value is frozen until
the next time the chip enters the RX state. The
RSSI value is in dB with dB resolution.
If PKTCTRL1.APPEND_STATUS is enabled, a
snapshot of the RSSI during the first 8 bytes of
the packet is automatically added to the end of
each received packet.
25.3
Carrier Sense (CS)
The Carrier Sense flag is used as a sync word
qualifier and for CCA. The CS flag can be set
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).
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.
Carrier Sense (CS) 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. The signal can also
be observed on one of the GDO pins and in
the status register bit PKTSTATUS.CS.
Other uses of Carrier Sense include the TX-If-
CCA function (see section 25.4 on page 28)
and the optional fast RX termination (see
section 27.7 on page 33).
25.4
Clear Channel Assessment (CCA)
The Clear Channel Assessment is used to
indicate if the current channel is free or busy.
The current CCA state is viewable on any of
GDO pins.
selects the mode to use
when determining CCA.
When the STX or SFSTXON command strobe is
given while
CC1100 is in the RX state, the TX
state is only entered if the clear channel
requirements are fulfilled. The chip will
otherwise remain in RX. This feature is called
TX if CCA.
Four CCA requirements can be programmed:
Always (CCA disabled, always goes to TX)
If RSSI is below threshold
Unless currently receiving a packet
Both the above (RSSI below threshold and
not currently receiving a packet)
25.5
Link Quality Indicator (LQI)
The Link Quality Indicator is a metric of the
current quality of the received signal. If
is enabled, the
value is automatically appended to the end of
each received packet. The value can also be
read from the LQI status register. The LQI is
calculated over the 64 symbols following the
sync word (first 8 packet bytes). LQI is best
used as a relative measurement of the link
quality, since the value is dependent on the
modulation format.
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