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PDF ( 数据手册 , 数据表 ) SX1273

零件编号 SX1273
描述 Low Power Long Range Transceiver
制造商 Semtech
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SX1273 数据手册, 描述, 功能
SX1272/73
WIRELESS, SENSING & TIMING
DATASHEET
SX1272/73 - 860 MHz to 1020 MHz Low Power Long Range Transceiver
GENERAL DESCRIPTION
The SX1272/73 transceivers feature the LoRaTM long range
modem that provides ultra-long range spread spectrum
communication and high interference immunity whilst
minimising current consumption.
Using Semtech’s patented LoRaTM modulation technique
SX1272/73 can achieve a sensitivity of over -137 dBm using
a low cost crystal and bill of materials. The high sensitivity
combined with the integrated +20 dBm power amplifier
yields industry leading link budget making it optimal for any
application requiring range or robustness. LoRaTM also
provides significant advantages in both blocking and
selectivity over conventional modulation techniques, solving
the traditional design compromise between range,
interference immunity and energy consumption.
These devices also support high performance (G)FSK
modes for systems including WMBus, IEEE802.15.4g. The
SX1272/73 deliver exceptional phase noise, selectivity,
receiver linearity and IIP3 for significantly lower current
consumption than competing devices.
ORDERING INFORMATION
Part Number
SX1272IMLTRT
SX1273IMLTRT
Delivery
T&R
T&R
MOQ / Multiple
3000 pieces
3000 pieces
QFN 28 Package - Operating Range from -40 to +85°C
Pb-free, Halogen free, RoHS/WEEE compliant product
KEY PRODUCT FEATURES
LoRaTM Modem
157 dB maximum link budget
+20 dBm at 100 mW constant RF output vs. V supply
+14 dBm high efficiency PA
Programmable bit rate up to 300 kbps
High sensitivity: down to -137 dBm
Bullet-proof front end: IIP3 = -12.5 dBm
89 dB blocking immunity
Low RX current of 10 mA, 100 nA register retention
Fully integrated synthesizer with a resolution of 61 Hz
FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation
Built-in bit synchronizer for clock recovery
Preamble detection
127 dB Dynamic Range RSSI
Automatic RF Sense and CAD with ultra-fast AFC
Packet engine up to 256 bytes with CRC
Built-in temperature sensor and low battery indicator
APPLICATIONS
Automated Meter Reading
Home and Building Automation
Wireless Alarm and Security Systems
Industrial Monitoring and Control
Long range Irrigation Systems
Rev. 3 - March 2015
©2015 Semtech Corporation
Page 1
www.semtech.com







SX1273 pdf, 数据表
WIRELESS, SENSING & TIMING
Table of contents
Section
SX1272/73
DATASHEET
Page
Figure 1. SX1272/73 Block Diagram ............................................................................................................................10
Figure 2. Pin Diagram ...................................................................................................................................................11
Figure 3. Package Marking ...........................................................................................................................................13
Figure 4. Simplified SX1272 Block Schematic Diagram ...............................................................................................21
Figure 5. LoRaTM Modem Connectivity .......................................................................................................................24
Figure 6. LoRaTM Packet Structure .............................................................................................................................27
Figure 7. Interrupts generated in the case of successful frequency hopping communication. .....................................30
Figure 8. LoRaTM data buffer ......................................................................................................................................31
Figure 9. Applied versus measured frequency offset and influence on PER. ..............................................................34
Figure 10. LoRaTM modulation transmission sequence. .............................................................................................35
Figure 11. LoRaTM receive sequence. ........................................................................................................................36
Figure 12. LoRaTM CAD flow .......................................................................................................................................40
Figure 13. Channel activity detection (CAD) time as a function of spreading factor. ...................................................41
Figure 14. Consumption Profile of the LoRa CAD Process ..........................................................................................42
Figure 15. OOK Peak Demodulator Description ...........................................................................................................45
Figure 16. Floor Threshold Optimization ......................................................................................................................46
Figure 17. Bit Synchronizer Description .......................................................................................................................47
Figure 18. Startup Process ...........................................................................................................................................51
Figure 19. Time to Rssi Sample ...................................................................................................................................52
Figure 20. Tx to Rx Turnaround ...................................................................................................................................53
Figure 21. Rx to Tx Turnaround ...................................................................................................................................53
Figure 22. Receiver Hopping ........................................................................................................................................54
Figure 23. Transmitter Hopping ....................................................................................................................................54
Figure 24. Timer1 and Timer2 Mechanism ...................................................................................................................58
Figure 25. Sequencer State Machine ...........................................................................................................................60
Figure 26. SX1272/73 Data Processing Conceptual View ...........................................................................................62
Figure 27. FIFO and Shift Register (SR) ......................................................................................................................63
Figure 28. FifoLevel IRQ Source Behavior ...................................................................................................................64
Figure 29. Sync Word Recognition ...............................................................................................................................65
Figure 30. Continuous Mode Conceptual View ............................................................................................................67
Figure 31. Tx Processing in Continuous Mode .............................................................................................................67
Figure 32. Rx Processing in Continuous Mode ............................................................................................................68
Figure 33. Packet Mode Conceptual View ...................................................................................................................69
Figure 34. Fixed Length Packet Format .......................................................................................................................70
Figure 35. Variable Length Packet Format ...................................................................................................................71
Figure 36. Unlimited Length Packet Format .................................................................................................................71
Figure 37. Manchester Encoding/Decoding .................................................................................................................75
Figure 38. Data Whitening Polynomial .........................................................................................................................76
Figure 39. SPI Timing Diagram (single access) ...........................................................................................................77
Rev. 3 - March 2015
©2015 Semtech Corporation
Page 8
www.semtech.com







SX1273 equivalent, schematic
WIRELESS, SENSING & TIMING
SX1272/73
DATASHEET
BRF
BRO
BRA
FDA
Bit rate, FSK
Bit rate, OOK
Bit Rate Accuracy
Frequency deviation, FSK (1)
Programmable values (1)
Programmable
ABS(wanted BR - available BR)
Programmable
FDA + BRF/2 =< 250 kHz
1.2 -
300 kbps
1.2 - 32.768 kbps
- - 250 ppm
0.6 -
200 kHz
Note For Maximum Bit Rate the maximum modulation index is 0.5.
2.5.3. FSK/OOK Mode Receiver
All receiver tests are performed with RxBw = 10 kHz (Single Side Bandwidth) as programmed in RegRxBw, receiving a
PN15 sequence. Sensitivities are reported for a 0.1% BER (with Bit Synchronizer enabled), unless otherwise specified.
Blocking tests are performed with an unmodulated interferer. The wanted signal power for the Blocking Immunity, ACR,
IIP2, IIP3 and AMR tests is set 3 dB above the receiver sensitivity level.
Table 8 Receiver Specification
Symbol
RFS_F
RFS_O
CCR
ACR
BI
AMR
Description
Conditions
Direct tie of RFI and RFO pins,
shared Rx, Tx paths FSK sensitiv-
ity, highest LNA gain.
FDA = 5 kHz, BR = 1.2 kbps
FDA = 5 kHz, BR = 4.8 kbps
FDA = 40 kHz, BR = 38.4 kbps*
FDA = 20 kHz, BR = 38.4 kbps**
FDA = 62.5 kHz, BR = 250 kbps***
Split RF paths, LnaBoost is turned
on, the RF switch insertion loss is
not accounted for.
FDA = 5 kHz, BR = 1.2 kbps
FDA = 5 kHz, BR = 4.8 kbps
FDA = 40 kHz, BR = 38.4 kbps*
FDA = 20 kHz, BR = 38.4 kbps**
FDA = 62.5 kHz, BR = 250 kbps***
OOK sensitivity, highest LNA gain
shared Rx, Tx paths
Co-Channel Rejection
Adjacent Channel Rejection
BR = 4.8 kbps
BR = 32 kbps
FDA = 2 kHz, BR = 1.2 kbps,
RxBw = 5.2 kHz
Offset = +/- 25 kHz
FDA = 5 kHz, BR=4.8kbps
Offset = +/- 25 kHz
Offset = +/- 50 kHz
Blocking Immunity
Offset = +/- 1 MHz
Offset = +/- 2 MHz
Offset = +/- 10 MHz
AM Rejection, AM modulated
interferer with 100% modulation
depth, fm = 1 kHz, square
Offset = +/- 1 MHz
Offset = +/- 2 MHz
Offset = +/- 10 MHz
Min Typ Max Unit
- -119 - dBm
- -115 - dBm
- -105 - dBm
- -106 - dBm
- -92 - dBm
- -123 - dBm
- -119 - dBm
- -110 - dBm
- -110 - dBm
- -97 - dBm
- -117 - dBm
- -108 - dBm
- -9 - dB
- 54 - dB
- 50 - dB
- 50 - dB
- 73 - dB
- 78 - dB
- 87 - dB
- 73 - dB
- 78 - dB
- 87 - dB
Rev. 3 - March 2015
©2015 Semtech Corporation
Page 16
www.semtech.com










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