The fraction of a symbol period used to
change the phase can be modified with the
valent to changing the shaping of the
The MSK modulation format implemented in
inverts the sync word and data
compared to e.g. signal generators.
The supported amplitude modulation On
Keying (OOK) simply turns on
modulate 1 and 0 respectively.
Received Signal Qualifiers and Link Quality Information
has several qualifiers that can be used
to increase the likelihood that a valid sync
ction in RX is enabled in
filling the RX FIFO and perform the packet
filtering described in Section
valid sync word has been detected. The sync
15/16 sync word bits detected
16/16 sync word bits detected
30/32 sync word bits detected
No preamble/sync, carrier sense
15/16 + carrier sense above
16/16 + carrier sense above threshold
30/32 + carrier sense above threshold
Preamble Quality Threshold (PQT)
The Preamble Quality Threshold (PQT) sync
word qualifier adds the r
received sync word must be preceded with a
preamble with a quality above a programmed
Another use of the preamble quality threshold
is as a qualifier for the optional RX termination
The preamble quality estimator increases an
internal counter by one each time a bit is
received that is different from the previous bit,
and decreases the counter by
bit is received that is the same as the last bit.
The threshold is configured with the register
this counter is used to gate sync word
detection. By setting the value to zero, the
preamble quality qualifier of the sync word is
determine if preamble quality is reached b
This signal / bit asserts
when the received signal exceeds the PQT.
The RSSI value is an estimate of the signal
based on the current gain setting in the RX
chain and the measured signal level in the
In RX mode, the RSSI value can be read
continuously from the RSSI status register
until the demodulator detects a sync word
point the RSSI readout value is frozen until the
next time the chip enters the RX state.
receiver filter bandwidth (BW
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