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SI4438-C 数据表(PDF) 21 Page - Silicon Laboratories

部件名 SI4438-C
功能描述  Low active power consumption
Download  44 Pages
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制造商  SILABS [Silicon Laboratories]
网页  http://www.silabs.com
标志 SILABS - Silicon Laboratories

SI4438-C 数据表(HTML) 21 Page - Silicon Laboratories

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Si4438-C
Rev 1.0
21
4.3. Preamble Length
4.3.1. Digital Signal Arrival Detector
Traditional preamble detection requires 20 bits to detect preamble. This device introduces a new approach to
signal detection that can detect a preamble pattern in as little as one byte. If AFC is enabled, a preamble length of
two bytes is sufficient to reliably detect signal arrival and settle a one shot AFC. The impact of this is significant for
low-power solutions as it reduces the amount of time the receiver has to stay active to detect the preamble. This
feature is used with Preamble Sense Mode (see "8.6. Preamble Sense Mode" on page 35) and the latest WMBus
N modes as well as with features, such as frequency hopping, which may use signal arrival as a condition to hop.
The traditional preamble detector is also available to maintain backward compatibility. Note that the DSA is using
the RSSI jump detector. When used for collision detection, the RSSI jump detector may need to be reconfigured
after preamble detection. Refer to the API documentation for details on how to configure the device to use the
signal arrival detector.
4.3.2. Traditional Preamble Detection
Optimal performance of the chip is obtained by qualifying reception of a valid Preamble pattern prior to continuing
with reception of the remainder of the packet (e.g., Sync Word and Payload). Reception of the Preamble is
considered valid when a minimum number of consecutive bits of 101010... pattern have been received; the
required
threshold
for
preamble
detection
is
specified
by
the
RX_THRESH[6:0]
field
in
the
PREAMBLE_CONFIG_STD_1 property. The appropriate value of the detection threshold depends upon the
system application and typically trades off speed of acquisition against the probability of false detection. If the
detection threshold is set too low, the chip may readily detect the short pattern within noise; the chip then proceeds
to attempt to detect the remainder of the non-existent packet, with the result that the arrival of an actual valid
packet may be missed. If the detection threshold is set too high, the required number of transmitted Preamble bits
must be increased accordingly, leading to longer packet lengths and shorter battery life. A preamble detection
threshold value of 20 bits is suitable for most applications. The total length of the transmitted Preamble field must
be at least equal to the receive preamble detection threshold, plus an additional number of bits to allow for
acquisition of bit timing and settling of the AFC algorithm. The recommended preamble detection thresholds and
preamble lengths for a variety of operational modes are listed in Table 13. Configuration of the preamble detection
threshold in the RX_THRESH[6:0] field is only required for reception of a standard Preamble pattern (i.e., 101010...
pattern). Reception of a repetitive but non-standard Preamble pattern is also supported in the chip but is configured
through the PREAMBLE_CONFIG_NSTD and PREAMBLE_PATTERN properties.


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