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WIRELESS, SENSING & TIMING PRODUCTS
SX1276 Development KitUSER GUIDE
Revision 1.1 – May 2014 Page 2 of 53 www.semtech.com ©2014 Semtech Corporation
Table of Contents
Table of Contents .......................................................................................................................................... 2 Index of Figures ............................................................................................................................................ 3 1 Preamble ................................................................................................................................................ 4 2 Introduction ............................................................................................................................................ 4 3 Getting Started ....................................................................................................................................... 5
3.1 Evaluation Kit Contents ................................................................................................................. 5 3.2 Ordering information ..................................................................................................................... 6 3.3 Updating the firmware ................................................................................................................... 6
4 Eiger Platform Presentation ................................................................................................................... 6 4.1 Platform Description .................................................................................................................... 10 4.2 SX1276 Module Hardware .......................................................................................................... 11
4.2.1 SX1276RF1IAS ....................................................................................................................... 11 4.2.2 SX1276RF1JAS ...................................................................................................................... 12 4.2.3 SX1276RF1KAS...................................................................................................................... 13 4.2.4 Module Antenna ...................................................................................................................... 14
5 Eiger platform for PER Testing ............................................................................................................ 15 5.1 Menu Description ........................................................................................................................ 15 5.2 Using the Eiger platform .............................................................................................................. 15
5.2.1 System Window....................................................................................................................... 16 5.2.2 PER Demo Window ................................................................................................................ 19 5.2.3 PER Rx Bar-graph .................................................................................................................. 28
6 SX1276SKA Software Description ....................................................................................................... 29 6.1 SX1276SKA Quick start Guide ................................................................................................... 29 6.2 LoRa Mode .................................................................................................................................. 32
6.2.1 LoRa Menu .............................................................................................................................. 32 6.2.2 LoRa Common Window .......................................................................................................... 33 6.2.3 LoRa Parameters Window ...................................................................................................... 34
6.3 FSK Mode ................................................................................................................................... 35 6.3.1 FSK Menu ............................................................................................................................... 35 6.3.2 Common window ..................................................................................................................... 36 6.3.3 Transmitter window ................................................................................................................. 37 6.3.4 Receiver window ..................................................................................................................... 38 6.3.5 IRQ and Map window .............................................................................................................. 39 6.3.6 Packet Handler window ........................................................................................................... 40 6.3.7 Sequencer window .................................................................................................................. 41 6.3.8 Temperature window ............................................................................................................... 42
7 How to... ............................................................................................................................................... 43 7.1 … perform a simple transmission / reception in LoRa ................................................................ 43 7.2 … perform a simple transmission / reception in FSK .................................................................. 45 7.3 … perform Continuous transmission and Reception in LoRa ..................................................... 49 7.4 … Log the Transmitted or Received packets .............................................................................. 50 7.5 … perform a CW or PN9 Tx test on the SX1276 ........................................................................ 51 7.6 … check the frequency accuracy of the SX1276 module ........................................................... 51
8 Troubleshooting ................................................................................................................................... 52 8.1 The Eiger platform indicates very high PER even in short range ............................................... 52 8.2 The communication range in Lora is very poor ........................................................................... 52 8.3 The SX1276SKA do not detect the device through the USB ...................................................... 52 8.4 The Eiger platform does not seem to work anymore .................................................................. 52 8.5 The Eiger platform touch screen is not accurate ........................................................................ 52
WIRELESS, SENSING & TIMING PRODUCTS
SX1276 Development KitUSER GUIDE
Revision 1.1 – May 2014 Page 3 of 53 www.semtech.com ©2014 Semtech Corporation
Index of Figures
Figure 1: SX1276 Development Kit ............................................................................................................... 5 Figure 2: Eiger platform description ............................................................................................................ 10 Figure 3: SX1276RF1IAS Module Schematic ............................................................................................. 11 Figure 4: SX1276RF1JAS Module Schematic ............................................................................................ 12 Figure 5: SX1276RF1KAS Module Schematic ........................................................................................... 13 Figure 6: LF and HF Antenna Connection .................................................................................................. 14 Figure 7: Frequency Band Targeted Antenna............................................................................................. 14 Figure 8: Connect both USB ports to use the SX1276SKA ........................................................................ 29 Figure 9: SX1276 window organization ...................................................................................................... 30 Figure 10: Register table ............................................................................................................................. 31 Figure 11: SX1276SKA Boot-up windows .................................................................................................. 33 Figure 12: LoRa Radio parameters window ................................................................................................ 34 Figure 13: FSK window structure ................................................................................................................ 35 Figure 14: FSK Common window ............................................................................................................... 36 Figure 15: FSK Transmitter window ............................................................................................................ 37 Figure 16: FSK Receiver window ................................................................................................................ 38 Figure 17: FSK IRQ and Map window ........................................................................................................ 39 Figure 18: FSK Packet Handler window ..................................................................................................... 40 Figure 19: FSK Sequencer window ............................................................................................................ 41 Figure 20: FSK Temperature window ......................................................................................................... 42
WIRELESS, SENSING & TIMING PRODUCTS
SX1276 Development KitUSER GUIDE
Revision 1.1 – May 2014 Page 4 of 53 www.semtech.com ©2014 Semtech Corporation
1 Preamble This document describes how to use the SX1276 Evaluation kit. This document describes especially the SX1276 Eiger platform and the SX1276SKA User Interface. We strongly recommend for the user to read thoroughly the datasheet of the SX1276 prior to start working on the device. Most of this document assumes a general knowledge on the SX1276 and modern RF communications.
2 Introduction The SX1276 is a single-chip integrated circuit ideally suited for today's high performance ISM band RF applications. Added to the renowned, high-performance and low-cost, FSK / OOK RF transceiver modem, the SX1276 is also equipped with the LoRa proprietary transceiver modem. This advanced feature set, including a state of the art packet engine, greatly simplifies system design whilst the high level of integration reduces the external BOM to a handful of passive decoupling and matching components. It is intended for use as high-performance, long range, half-duplex bi-directional RF links, and where stable and constant RF performances are required over the full operating range of the device down to 1.8V. The SX1276 is intended for applications over a wide frequency range and it is covering all available sub-1GHz frequency bands (168MHz, 434MHz, 470MHz, 868MHz and 902MHz). Coupled with a link budget in excess of 135 dB in FSK in excess of 155 dB in LoRa, the SX1276 really offers the possibility of two modems in one single package. The SX1276 complies with both ETSI and FCC regulatory requirements and is available in a 5x5 mm QFN 28 lead free package. The SX1276 Evaluation kit, based around the Eiger platform, allows the user to test every aspect of the radio, both from the system and RF point of view. On one hand, the Eiger platform is a touch screen portable device which has been design to enable quick and easy testing of the PER performances of the SX1276. On the other hand, the SX1276SKA is a PC based evaluation tool which allows in depth testing of the radio. This document is therefore divided in two parts: the first part present the SX1276 Eiger module and how to perform PER test in LoRa and FSK; the second part of this document present the SX1276 SKA and how it can be used to test every single aspect of the radio.
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WIRELESS, SENSING & TIMING PRODUCTS
SX1276 Development KitUSER GUIDE
Revision 1.1 – May 2014 Page 51 of 53 www.semtech.com ©2014 Semtech Corporation
7.5 … perform a CW or PN9 Tx test on the SX1276 The SX1276 does not have a dedicated CW or PN9 Tx test mode implemented. However, it is possible to perform this test manually by setting the device in Tx continuous mode, and feed PN9/15 data stream to the DATA pin (DIO2/DATA), from a signal generator.
7.6 … check the frequency accuracy of the SX1276 module There is a very simple way to get the frequency error of the sx1276 modules. The core idea is to set the device in FSK and to set the frequency deviation to 0. In this case, the device will only emit a signal at the center frequency. The difference between the measured value and the set value gives you the frequency error.
WIRELESS, SENSING & TIMING PRODUCTS
SX1276 Development KitUSER GUIDE
Revision 1.1 – May 2014 Page 52 of 53 www.semtech.com ©2014 Semtech Corporation
8 Troubleshooting Each Eiger platform, radio module or software kit has been thoroughly tested before to be released for customer evaluation. The section below highlights some of the common issues faced by users and how it can be fixed.
8.1 The Eiger platform indicates very high PER even in short range There are several reasons which can have a dramatic influence over the performance of the platform. One of the common reasons is that the frequency selected is in the GSM or in another already used frequency band. If the frequency you have selected is already used by another RF system, the communication will obviously be affected. We therefore recommend to the user to check the RF band usage in his location before to start any PER testing.
8.2 The communication range in Lora is very poor There are two aspects which can limit the LoRa performances: the emission power and the antenna. Please, make sure that we are using enough power to reach the distance you want to achieve. The Eiger platform can output up to 20dBm signals. The other aspect is the antenna, please, make sure the antenna you are using is designed to operate at the frequency region you are transmitting in.
8.3 The SX1276SKA do not detect the device through the USB This issue is usually caused by a wrong connection of the USB The step below should fix the issue.
1- Make sure the Eiger Platform is powered down (Battery switch set to 0) and is not connected to the PC through the USB.
2- Reconnect the side USB to the PC, the red LED on the left side should light up 3- Connect the bottom USB to the PC. 4- Power the device up (Battery switch set to 1) 5- Press the five-way central push button until the screen light up. 6- Launch the SX1276SKA on the PC
8.4 The Eiger platform does not seem to work anymore The battery is probably empty and you should connect the device through the side USB to a computer for a few hours, time for the battery to charge.
8.5 The Eiger platform touch screen is not accurate This is probably due to a miss-calibration of the touch screen. In this situation, the user should reset the touch screen calibration and perform an accurate calibration using the stylus provided.
WIRELESS, SENSING & TIMING PRODUCTS
SX1276 Development KitUSER GUIDE
Revision 1.1 – May 2014 Page 53 of 53 www.semtech.com ©2014 Semtech Corporation
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© Semtech 2014 All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation outside the specified range. SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF SEMTECH PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER’S OWN RISK. Should a customer purchase or use Semtech products for any such unauthorized application, the customer shall indemnify and hold Semtech and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs damages and attorney fees
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