Semtech SX1272 User Manual Download Page 21

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WIRELESS, SENSING and TIMING PRODUCTS

LoRaMote

USER GUIDE

Revision 2.0

– July 2014

Page 21 of 23

www.semtech.com

The figure below highlights the power consumption of the WiMOD during a successful reception.

Figure 7: Power Consumption with successful Rx

Here the Rx Window is only opened once

and its duration is longer as it is staying

active for the length of the packet

The Rx Window 2 is not present

as a packet has been received

Summary of Contents for SX1272

Page 1: ...WIRELESS SENSING and TIMING PRODUCTS LoRaMote USER GUIDE Revision 2 0 July 2014 Page 1 of 23 www semtech com 2014 Semtech Corporation LoRaMote USER GUIDE ...

Page 2: ...nsor MPL3115A2 8 4 3 4 SAR proximity sensor SX9500 9 4 3 5 GPS module UP501 9 4 3 6 IO Expander 9 4 3 7 EEPROM 9 5 LoRaMote Demo Software 10 5 1 Updating the LoRaMote Firmware 10 5 1 1 Programming the LoRaMote through the JTAG connector 10 5 1 2 Programming the LoRaMote through the USB Bootloader 13 5 2 Payload Format 17 5 3 PER Analysis 18 6 WiMOD iM880A Energy profile 19 Index of Figures Figure ...

Page 3: ...l RF links and where stable and constant RF performances are required over the full operating range of the device down to 1 8V The SX1272 is intended for applications over a wide frequency range including the 868 MHz European and the 902 928 MHz North American ISM bands Coupled with a link budget in excess of 135 dB in FSK in excess of 155 dB in LoRa the SX1272 really offers the possibility of two...

Page 4: ...into a single user friendly battery powered handheld device While not being a real turn key solution the use of the WiMOD iM880A allows the software developer to re use all the development work into another final product Figure 1 LoRaMote Hardware Description USB Connector Power Switch GPS JTAG Connector 868 MHz ISM PCB Antenna WiMOD iM880A SAR Controller EEPROM Header Connector IO expander Accele...

Page 5: ...M are available upon request Figure 2 LoRaMote Schematics The LoRaMote can either be supplied with a 9V alkaline battery of through the USB connector The internal circuitry is however powered at 3 3V The power switch allows to user to select whether the board is powered from the USB or from the battery When both a battery and the USB connector are power supplied the switch is rendered useless and ...

Page 6: ... a STM32L151Cx MCU from ST Microelectronics As equipped with the SX1272 the modules operates in the license free 868 MHz ISM frequency band and includes all necessary passive components for wireless communication The modules is therefore ideal for any user who would like to shorten the time to market of its final product This module the WiMOD iM880A is fully certified and is fitted with the STM32L...

Page 7: ... 20 dBm in the 868 MHz ISM band All the antenna design parameters are freely available upon request Figure 4 PCB Antenna This antenna has been tested and a range of over 10km has been reached with the adequate setup For more information on the LoRa parameters allowing achieving this range please refer to the datasheet of the SX1272 It is also possible to remove the breakable antenna and connect a ...

Page 8: ...main in a low power mode during periods of inactivity The MMA841Q is accessible through the I2C bus at the address 0x1C Please consult Freescale website for more detailed information on the device 4 3 2 3 Axis Magnetometer sensor MAG3110 The MAG3110 is a small low power digital 3 D magnetic sensor with a wide dynamic range to allow operation in PCBs with high extraneous magnetic fields The MAG3110...

Page 9: ...vice 4 3 5 GPS module UP501 The u blox UP501 GPS receiver module with embedded GPS antenna enables high performance navigation in the most stringent applications and solid fix even in harsh GPS visibility environments The UP501 is implemented with a Deep Sleep mode allowing reducing the power consumption while the positioning of the device is not mandatory Connected to the UART of the WiMOD iM880A...

Page 10: ...version of the software programmed in the LoRaMote or if the software has been corrupted it may be necessary to re flash the platform using a JTAG programmer 5 1 1 Programming the LoRaMote through the JTAG connector Semtech provide an updater which can operate either with the Raisonance R Link or with the standard STM ST Link In both case the process is the following Download the zip file LoRaMote...

Page 11: ...isplayed with the option to select whether the code to be programmed must have the ADR Adaptative Data Rate enable or disable In case of doubt please select ADR OFF This is the last point to which it is still possible to cancel the upload of a new firmware in the LoRaMote The user is thus asked to press any key to continue or to press Ctrl C to cancel the operation ...

Page 12: ... semtech com 2014 Semtech Corporation Once the programming is complete the following window should be displayed At this stage the firmware programmed is equipped with the USB Bootloader and it should not be necessary to do this operation again unless the code is corrupted due to wrong manipulations ...

Page 13: ...ttery Connect the USB cable to the mote Then to enter in bootloader mode it is necessary to have a finger pressed against the SAR sensor present on the back of the RF antenna Please refer to the picture below The user can then power up the mote through the side switch while keeping its finger pressed on the SAR sensor as shown below The user should then see the three LEDs flashing at a one second ...

Page 14: ...plication provided by ST The executable is located in the zip file downloaded under LoRaMote eu868 fw Updater DfuSe 3 0 0 BIN and it is necessary to launch the application DfuSeDemo exe You can then click on Choose to select the file you want to program into the board If necessary change the directory to LoRaMote eu868 fw Updater LoRaMote Capacitive Antenna Select both options ...

Page 15: ...sion 2 0 July 2014 Page 15 of 23 www semtech com 2014 Semtech Corporation Once the file is selected it is simply a matter of selecting the Upgrade button You should see a warning window from the Application but the user simply needs to click on Yes Select Upgrade ...

Page 16: ...E Revision 2 0 July 2014 Page 16 of 23 www semtech com 2014 Semtech Corporation The DfuSe Application will start with erasing the FLASH memory and then it will upgrade the firmware Once successful the user needs to quit the application and reboot the board ...

Page 17: ...emperature Byte 3 and 4 represent the signed value of the temperature x 100 as it is measured through the MPL3115A2 This value can easily be divided by 100 to get the temperature with decimal values Byte 5 Value MSB of the MPL3115A2 measured Altitude Byte 6 Value LSB of the MPL3115A2 measured Altitude Byte 5 and 6 represent the signed value of the altitude x 10 as it is measured through the MPL311...

Page 18: ...ude as defined by the LoRaMAC specification The east west longitude is encoded using a signed 24 bit word where corresponds to 180 west and 1 corresponds to 180 east The Greenwich meridian corresponds to 0 Byte 14 Value MSB of the UP501 received Altitude Byte 15 Value LSB of the UP501 received Altitude Byte 14 and 15 represent the value of the altitude in meters as it is received through the UP501...

Page 19: ...als are in sleep mode most of the time The purple line shows the current consumption of the WiMOD across a 100 ohm resistor R40 on the schematics is a 0 ohm resistor which can be removed to allow measuring the current Figure 5 WiMOD Energy Profile For details information on the LoRa protocol it is advised to read the LoRaMAC specifications The principal aspect of the protocol is the opening of two...

Page 20: ... duration is SF dependent The Rx Window 1 is opened exactly 1s after the end of the Tx The Rx Window 1 is opened for 5 symbols at SF12 The Rx Windows are 5 symbols at SF12 Depending on the SF the Rx Windows are thus changing Delay between Tx Sensor power consumption duration and power consumption is sensor dependent The Rx Window 2 is opened exactly 2s after the end of the Tx if no packet was rece...

Page 21: ...poration The figure below highlights the power consumption of the WiMOD during a successful reception Figure 7 Power Consumption with successful Rx Here the Rx Window is only opened once and its duration is longer as it is staying active for the length of the packet The Rx Window 2 is not present as a packet has been received ...

Page 22: ...Rate is active the Gateway can send the information to the Node to switch to a lower SF Here the power consumption is greatly reduced during the transmission and reception as the SF is much lower Figure 8 Power Consumption at SF12 The difference is transmission time and thus power consumption is greatly reduced as the SF goes lower The same goes for the Rx Windows ...

Page 23: ...mproper 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 O...

Page 24: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Semtech SX1272LM1BAP ...

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