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
CONTROL
DIO0
DIO1
DIO2
DIO3
DIO4
DIO5
Data Rx SYNC
RECOG.
Tx
PACKET
HANDLER
FIFO
(+SR)
SPI
NSS
SCK
MOSI
MISO
Figure 32. Packet Mode Conceptual View
Note The Bit Synchronizer is automatically enabled in Packet mode.
4.2.13.2. Packet Format
Fixed Length Packet Format
Fixed length packet format is selected when bit PacketFormat is set to 0 and PayloadLength is set to any value greater
than 0.
In applications where the packet length is fixed in advance, this mode of operation may be of interest to minimize RF
overhead (no length byte field is required). All nodes, whether Tx only, Rx only, or Tx/Rx should be programmed with the
same packet length value.
The length of the payload is limited to 2047 bytes.
The length programmed in PayloadLength relates only to the payload which includes the message and the optional
address byte. In this mode, the payload must contain at least one byte, i.e. address or message byte.
An illustration of a fixed length packet is shown below. It contains the following fields:
Preamble (1010...)
Sync word (Network ID)
Optional Address byte (Node ID)
Message data
Optional 2-bytes CRC checksum
Rev. 4 - March 2015
©2015 Semtech Corporation
Page 72
www.semtech.com
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