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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
Name
(Address)
Bits
Variable Name
7-4 SpreadingFactor
RegModemConfig
2
(0x1E)
3
TxContinuousMode
2
RxPayloadCrcOn
1-0 SymbTimeout(9:8)
RegSymbTimeoutL
sb
7-0
(0x1F)
SymbTimeout(7:0)
Mode Reset
LoRaTM Description
SF rate (expressed as a base-2 logarithm)
6 64 chips / symbol
7 128 chips / symbol
8 256 chips / symbol
rw 0x07 9 512 chips / symbol
10 1024 chips / symbol
11 2048 chips / symbol
12 4096 chips / symbol
other values reserved.
rw 0
0 normal mode, a single packet is sent
1 continuous mode, send multiple packets across the FIFO
(used for spectral analysis)
Enable CRC generation and check on payload:
0 CRC disable
1 CRC enable
rw 0x00 If CRC is needed, RxPayloadCrcOn should be set:
- in Implicit header mode: on Tx and Rx side
- in Explicit header mode: on the Tx side alone (recovered from
the header in Rx side)
rw 0x00 RX Time-Out MSB
RX Time-Out LSB
rw 0x64 RX operation time-out value expressed as number of symbols:
TimeOut = SymbTimeout Ts
RegPreambleMsb
(0x20)
7-0
PreambleLength(15:8)
rw
0x0
Preamble length MSB, = PreambleLength + 4.25 Symbols
See 4.1.1 for more details.
RegPreambleLsb
(0x21)
7-0
PreambleLength(7:0)
rw 0x8 Preamble Length LSB
RegPayloadLength
(0x22)
7-0
PayloadLength(7:0)
Payload length in bytes. The register needs to be set in implicit
rw 0x1 header mode for the expected packet length. A 0 value is not
permitted
RegMaxPayloadLe
ngth
7-0
PayloadMaxLength(7:0) rw
0xff
Maximum payload length; if header payload length exceeds
value a header CRC error is generated. Allows filtering of packet
(0x23)
with a bad size.
RegHopPeriod
(0x24)
7-0 FreqHoppingPeriod(7:0) rw
0x0
Symbol periods between frequency hops. (0 = disabled). 1st hop
always happen after the 1st header symbol
RegFifoRxByteAdd
r
7-0
(0x25)
FifoRxByteAddrPtr
r
n/a
Current value of RX databuffer pointer (address of last byte
written by Lora receiver)
Rev. 4 - March 2015
©2015 Semtech Corporation
Page 113
www.semtech.com
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