SX1276 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SX1276' PDF : 132 Pages View PDF
WIRELESS, SENSING & TIMING
SX1276/77/78/79
DATASHEET
LFSR Polynom ial =X9 + X5 + 1
X8
X7
X6
X5
X4
X3
X2
X1
X0
Transm it data
Figure 37. Data Whitening Polynomial
W hitened data
4.2.13.8. Beacon Tx Mode
In some short range wireless network topologies a repetitive message, also known as beacon, is transmitted periodically
by a transmitter. The Beacon Tx mode allows for the re-transmission of the same packet without having to fill the FIFO
multiple times with the same data.
When BeaconOn in RegPacketConfig2 is set to 1, the FIFO can be filled only once in Sleep or Stdby mode with the
required payload. After a first transmission, FifoEmpty will go high as usual, but the FIFO content will be restored when the
chip exits Transmit mode. FifoEmpty, FifoFull and FifoLevel flags are also restored.
This feature is only available in Fixed packet format, with the Payload Length smaller than the FIFO size. The control of the
chip modes (Tx-Sleep-Tx....) can either be undertaken by the microcontroller, or be automated in the Top Sequencer. See
example in Section 4.2.13.8.
The Beacon Tx mode is exited by setting BeaconOn to 0, and clearing the FIFO by setting FifoOverrun to 1.
4.2.14. io-homecontrol® Compatibility Mode
The SX1276/77/78/79 features a io-homecontrol® compatibility mode. Please contact your local Semtech representative
for details on its implementation.
Rev. 4 - March 2015
©2015 Semtech Corporation
Page 79
www.semtech.com
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