LoRasx1276\77\78\79调制模块数据手册资源-CSDN文库

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标题中提到的“LoRa sx1276/77/78/79 调制模块数据手册”指的是Semtech公司推出的SX1276/77/78/79系列LoRa调制器的数据手册，这些调制器是支持长距离、低功耗通信的无线射频收发器。LoRa是一种专利扩频调制技术，主要针对需要远距离通信的物联网(IoT)应用，它能够在极低的功耗下实现远距离传输，并具有较高的抗干扰能力。SX1276/77/78/79系列芯片因其在远程通讯领域中的优异表现，特别适合于需要高灵敏度和广泛传播距离的应用场景。描述中所述功能强大，特别适合物联网远程低功耗连接，反映了SX1276/77/78/79芯片的强项。SX1276/77/78/79通过LoRa调制技术，实现了低功耗的同时，还能保持远距离的数据传输。在物联网中，这种性能至关重要，因为物联网设备通常需要通过电池供电并且需要在广泛的区域中保持可靠的通信能力。 SX1276/77/78/79系列支持的LoRa调制模块支持137MHz到1020MHz的频率范围，这使得它们能够适应多种无线通信应用。数据手册中描述的“168dB最大链路预算”、“+20dBm-100mW的恒定射频输出”、“+14dBm高效率功率放大器”等特性，进一步确保了这种模块在低功耗和长距离通信方面的卓越性能。 SX1276/77/78/79芯片还集成了高灵敏度的接收机，其灵敏度可达-148dBm，这意味着即使在信号非常微弱的环境下，它们仍然能够进行有效通信。这种高灵敏度对于在城市地区、建筑物密集区或是受到干扰的环境中实现长距离通信尤为重要。在应用方面，SX1276/77/78/79系列的LoRa模块特别适合于各种需要远程无线通讯的场景，比如自动抄表、智能家居控制、无线安防系统、工业监测与控制以及远程灌溉等。它们的多功能性和灵活性满足了不同领域和场景对无线通讯的需求。在硬件设计方面，SX1276/77/78/79芯片采用QFN28封装，并且符合无铅、无卤素、RoHS/WEEE标准，这表明该产品在生产过程中对环境保护给予了充分考虑，同时也符合全球多数地区的环保法规要求。此外，SX1276/77/78/79芯片还具备一系列先进的通信特性，例如可编程的数据传输速率最高可达300kbps，内置时钟恢复功能的位同步器，以及用于前导码检测和自动射频检测(CAD)的高速自动频率控制(AFC)。这些功能为构建可靠的无线通信链路提供了强大的技术支撑。数据手册中还提到的“+127dB动态范围RSSI”和内置温度传感器及低电池指示器等功能，让这些芯片不仅仅适用于通信传输，还能够为环境监测、设备维护和电池管理提供辅助信息。在选择和采购这些芯片时，制造商提供了一系列的产品订购信息，包括产品型号、最小订货数量以及封装类型，以便制造商或设计师能够方便地根据自己的需要进行采购。

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SX1276/77/78/79

www.semtech.comPage 1

WIRELESS, SENSING & TIMING DATASHEET

SX1276/77/78/79 - 137 MHz to 1020 MHz Low Power Long Range Transceiver

Rev. 4 - March 2015

The SX1276/77/78/79 transceivers feature the LoRa

long

range modem that provides ultra-long range spread

spectrum communication and high interference immunity

whilst minimising current consumption.

Using Semtech’s patented LoRa

modulation technique

SX1276/77/78/79 can achieve a sensitivity of over -148dBm

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.

LoRa

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

SX1276/77/78/79 deliver exceptional phase noise,

selectivity, receiver linearity and IIP3 for significantly lower

current consumption than competing devices.

 QFN 28 Package - Operating Range [-40;+85°C]

 Pb-free, Halogen free, RoHS/WEEE compliant product

 LoRa

Modem

 168 dB maximum link budget

 +20 dBm - 100 mW constant RF output vs. V supply

 +14 dBm high efficiency PA

 Programmable bit rate up to 300 kbps

 High sensitivity: down to -148 dBm

 Bullet-proof front end: IIP3 = -11 dBm

 Excellent blocking immunity

 Low RX current of 9.9 mA, 200 nA register retention

 Fully integrated synthesizer with a resolution of 61 Hz

 FSK, GFSK, MSK, GMSK, LoRa

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

 Automated Meter Reading.

 Home and Building Automation.

 Wireless Alarm and Security Systems.

 Industrial Monitoring and Control

 Long range Irrigation Systems

GENERAL DESCRIPTION

ORDERING INFORMATION

Part Number Delivery MOQ / Multiple

SX1276IMLTRT T&R 3000 pieces

SX1277IMLTRT T&R 3000 pieces

SX1278IMLTRT T&R 3000 pieces

SX1279IMLTRT T&R 3000 pieces

KEY PRODUCT FEATURES

APPLICATIONS

www.semtech.comPage 2

Section Page

Table of contents

SX1276/77/78/79

WIRELESS, SENSING & TIMING DATASHEET

Rev. 4 - March 2015

1. General Description ................................................................................................................................................. 9

1.1. Simplified Block Diagram ................................................................................................................................. 9

1.2. Product Versions ............................................................................................................................................10

1.3. Pin Diagram ................................................................................................................................................... 10

1.4. Pin Description ...............................................................................................................................................11

1.5. Package Marking ...........................................................................................................................................12

2. Electrical Characteristics ....................................................................................................................................... 13

2.1. ESD Notice .................................................................................................................................................... 13

2.2. Absolute Maximum Ratings ........................................................................................................................... 13

2.3. Operating Range............................................................................................................................................ 13

2.4. Thermal Properties ........................................................................................................................................ 13

2.5. Chip Specification ..........................................................................................................................................14

2.5.1. Power Consumption .................................................................................................................................. 14

2.5.2. Frequency Synthesis................................................................................................................................. 14

2.5.3. FSK/OOK Mode Receiver .........................................................................................................................16

2.5.4. FSK/OOK Mode Transmitter ..................................................................................................................... 17

2.5.5. Electrical Specification for LoRaTM Modulation ........................................................................................19

2.5.6. Digital Specification ...................................................................................................................................22

3. SX1276/77/78/79 Features.................................................................................................................................... 23

3.1. LoRaTM Modem ............................................................................................................................................ 24

3.2. FSK/OOK Modem .......................................................................................................................................... 24

4. SX1276/77/78/79 Digital Electronics ..................................................................................................................... 25

4.1. The LoRaTM Modem ..................................................................................................................................... 25

4.1.1. Link Design Using the LoRaTM Modem ....................................................................................................26

4.1.2. LoRaTM Digital Interface ...........................................................................................................................34

4.1.3. Operation of the LoRaTM Modem............................................................................................................. 36

4.1.4. Frequency Settings ...................................................................................................................................37

4.1.5. Frequency Error Indication ........................................................................................................................ 37

4.1.6. LoRaTM Modem State Machine Sequences .............................................................................................38

4.1.7. Modem Status Indicators........................................................................................................................... 46

4.2. FSK/OOK Modem .......................................................................................................................................... 46

4.2.1. Bit Rate Setting ......................................................................................................................................... 46

4.2.2. FSK/OOK Transmission ............................................................................................................................ 47

4.2.3. FSK/OOK Reception ................................................................................................................................. 48

4.2.4. Operating Modes in FSK/OOK Mode ........................................................................................................ 54

4.2.5. Startup Times ............................................................................................................................................56

4.2.6. Receiver Startup Options .......................................................................................................................... 59

4.2.7. Receiver Restart Methods......................................................................................................................... 60

4.2.8. Top Level Sequencer ................................................................................................................................ 61

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Section Page

Table of contents

SX1276/77/78/79

WIRELESS, SENSING & TIMING DATASHEET

Rev. 4 - March 2015

4.2.9. Data Processing in FSK/OOK Mode ......................................................................................................... 65

4.2.10. FIFO ........................................................................................................................................................66

4.2.11. Digital IO Pins Mapping ...........................................................................................................................69

4.2.12. Continuous Mode ....................................................................................................................................70

4.2.13. Packet Mode ........................................................................................................................................... 71

4.2.14. io-homecontrol® Compatibility Mode ...................................................................................................... 79

4.3. SPI Interface ..................................................................................................................................................80

5. SX1276/77/78/79 Analog & RF Frontend Electronics............................................................................................ 81

5.1. Power Supply Strategy .................................................................................................................................. 81

5.2. Low Battery Detector ..................................................................................................................................... 81

5.3. Frequency Synthesis ..................................................................................................................................... 81

5.3.1. Crystal Oscillator ....................................................................................................................................... 81

5.3.2. CLKOUT Output ........................................................................................................................................ 82

5.3.3. PLL ............................................................................................................................................................ 82

5.3.4. RC Oscillator ............................................................................................................................................. 82

5.4. Transmitter Description ..................................................................................................................................83

5.4.1. Architecture Description ............................................................................................................................ 83

5.4.2. RF Power Amplifiers.................................................................................................................................. 83

5.4.3. High Power +20 dBm Operation ............................................................................................................... 84

5.4.4. Over Current Protection ............................................................................................................................85

5.5. Receiver Description...................................................................................................................................... 85

5.5.1. Overview ................................................................................................................................................... 85

5.5.2. Receiver Enabled and Receiver Active States.......................................................................................... 85

5.5.3. Automatic Gain Control In FSK/OOK Mode .............................................................................................. 85

5.5.4. RSSI in FSK/OOK Mode ........................................................................................................................... 86

5.5.5. RSSI and SNR in LoRaTM Mode.............................................................................................................. 87

5.5.6. Channel Filter ............................................................................................................................................ 88

5.5.7. Temperature Measurement....................................................................................................................... 89

6. Description of the Registers................................................................................................................................... 90

6.1. Register Table Summary ............................................................................................................................... 90

6.2. FSK/OOK Mode Register Map .......................................................................................................................93

6.3. Band Specific Additional Registers .............................................................................................................. 106

6.4. LoRaTM Mode Register Map....................................................................................................................... 108

7. Application Information ........................................................................................................................................ 115

7.1. Crystal Resonator Specification................................................................................................................... 115

7.2. Reset of the Chip ......................................................................................................................................... 115

7.2.1. POR......................................................................................................................................................... 115

7.2.2. Manual Reset ..........................................................................................................................................116

7.3. Top Sequencer: Listen Mode Examples ...................................................................................................... 116

www.semtech.comPage 4

Section Page

Table of contents

SX1276/77/78/79

WIRELESS, SENSING & TIMING DATASHEET

Rev. 4 - March 2015

7.3.1. Wake on Preamble Interrupt ................................................................................................................... 116

7.3.2. Wake on SyncAddress Interrupt ..............................................................................................................119

7.4. Top Sequencer: Beacon Mode ....................................................................................................................122

7.4.1. Timing diagram........................................................................................................................................ 122

7.4.2. Sequencer Configuration......................................................................................................................... 122

7.5. Example CRC Calculation ...........................................................................................................................124

7.6. Example Temperature Reading ...................................................................................................................125

8. Packaging Information ......................................................................................................................................... 127

8.1. Package Outline Drawing ............................................................................................................................ 127

8.2. Recommended Land Pattern ....................................................................................................................... 128

8.3. Tape & Reel Information .............................................................................................................................. 129

9. Revision History................................................................................................................................................... 130

www.semtech.comPage 5

Section Page

Table of contents

SX1276/77/78/79

WIRELESS, SENSING & TIMING DATASHEET

Rev. 4 - March 2015

Table 1. SX1276/77/78/79 Device Variants and Key Parameters .................................................................................10

Table 2. Pin Description ................................................................................................................................................11

Table 3. Absolute Maximum Ratings .............................................................................................................................13

Table 4. Operating Range .............................................................................................................................................13

Table 5. Thermal Properties ..........................................................................................................................................13

Table 6. Power Consumption Specification ...................................................................................................................14

Table 7. Frequency Synthesizer Specification ..............................................................................................................14

Table 8. FSK/OOK Receiver Specification ....................................................................................................................16

Table 9. Transmitter Specification .................................................................................................................................17

Table 10. LoRa Receiver Specification .........................................................................................................................19

Table 11. Digital Specification .......................................................................................................................................22

Table 12. Example LoRaTM Modem Performances, 868MHz Band .............................................................................25

Table 13. Range of Spreading Factors ..........................................................................................................................27

Table 14. Cyclic Coding Overhead ................................................................................................................................27

Table 15. LoRa Bandwidth Options ...............................................................................................................................28

Table 16. LoRaTM Operating Mode Functionality .........................................................................................................36

Table 17. LoRa CAD Consumption Figures ..................................................................................................................45

Table 18. DIO Mapping LoRaTM Mode .........................................................................................................................46

Table 19. Bit Rate Examples .........................................................................................................................................47

Table 20. Preamble Detector Settings ...........................................................................................................................53

Table 21. RxTrigger Settings to Enable Timeout Interrupts ..........................................................................................54

Table 22. Basic Transceiver Modes ..............................................................................................................................54

Table 23. Receiver Startup Time Summary ..................................................................................................................57

Table 24. Receiver Startup Options ..............................................................................................................................60

Table 25. Sequencer States ..........................................................................................................................................61

Table 26. Sequencer Transition Options .......................................................................................................................62

Table 27. Sequencer Timer Settings .............................................................................................................................63

Table 28. Status of FIFO when Switching Between Different Modes of the Chip .........................................................67

Table 29. DIO Mapping, Continuous Mode ...................................................................................................................69

Table 30. DIO Mapping, Packet Mode ..........................................................................................................................69

Table 31. CRC Description ...........................................................................................................................................77

Table 32. Frequency Bands ..........................................................................................................................................82

Table 33. Power Amplifier Mode Selection Truth Table ................................................................................................83

Table 34. High Power Settings ......................................................................................................................................84

Table 35. Operating Range, +20dBm Operation ...........................................................................................................84

Table 36. Operating Range, +20dBm Operation ...........................................................................................................84

Table 37. Trimming of the OCP Current ........................................................................................................................85

Table 38. LNA Gain Control and Performances ..................................................................................

..........................86

Table 39. RssiSmoothing Options .................................................................................................................................86