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Revision 2.0 – July 2010

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© Semtech 2010

SX1231-31SKB

USER GUIDE

SX1231SKB

USER GUIDE

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Summary of Contents for SX1231SKB

Page 1: ...Revision 2 0 July 2010 Page 1 of 24 www semtech com Semtech 2010 SX1231 31SKB USER GUIDE SX1231SKB USER GUIDE ...

Page 2: ...on Registers Tabs 12 5 1 Common Configuration Registers Tab 12 5 1 1 Modulation Mode Window 14 5 2 Transmitter Configuration Register Tab 14 5 3 Receiver Configuration Register Tab 15 5 3 1 Rx Bandwidth 15 5 3 2 LNA Gain Window 16 5 3 3 AFC FEI 16 5 3 4 RSSI 16 5 4 Irq Mapping Configuration Register Tab 17 5 5 Packet Handler Configuration Register Tab 19 5 5 1 Sync Word 19 5 5 2 AutoMode Operation...

Page 3: ...dicator 12 Figure 13 Common Configuration Register Tab 13 Figure 14 Dialog Box Error Message 13 Figure 15 Modulation Mode and Shaping Options 14 Figure 16 Transmitter Configuration Register Tab 14 Figure 17 Receiver Configuration Register Tab 15 Figure 18 Rx Bandwidth Window 15 Figure 19 LNA Gain Window 16 Figure 20 AFC FEI Window 16 Figure 21 RSSI Window 17 Figure 22 Irq Mapping Configuration Reg...

Page 4: ...8V The SX1231 is intended for applications over a wide frequency range including the 433 MHz and 868 MHz European and the 902 928 MHz North American ISM bands Coupled with a link budget in excess of 135 dB the advanced system features of the SX1231 include a 66 byte TX RX FIFO configurable automatic packet handler listen mode temperature sensor and configurable DIOs which greatly enhance system fl...

Page 5: ...KB USER GUIDE 2 Getting Started 2 1 Evaluation Kit Contents The SX1231 31SKB evaluation kit consists of 2 x SM1231 modules 2 x USB bridge modules 2 x wave monopole antennas Installation CD or insert sheet 2 x USB cables Figure 2 SM1231 Module Mounted on USB Bridge LED 2 LED 3 ...

Page 6: ...is also interfaced via the FTDI USB Bridge to the USB type A interface of a host PC Transmission and reception is indicated by a pair of LEDs on the USB Bridge 3 SX1231 Quick Start Guide It is recommended that this user guide is read in conjunction with the SX1231 datasheet 1 Plug the SX1231SKB into the USB port of the computer The USB power LED on the bridge should be illuminated 2 Run the SX1231...

Page 7: ...This functionality may also be accessed through the short cut buttons of the Window Toolbar see Section 4 3 Open Config allows for the opening of SX1231SKB configuration files cfg This is implemented through a standard Windows file dialog box and may also be accessed through the short cut buttons of the Window Toolbar Save Config allows for SX1231SKB configuration files cfg to be saved This is imp...

Page 8: ...ed through the short cut buttons of the Window Toolbar The register display window indicates the status of SX1231 configuration registers as detailed in the SX1231 datasheet Refer to Section for further information Monitor ON allows the GUI to constantly scan the status of the Irq registers RegIrqFlags1 and RegIrqFlags2 at addresses 0x27 and 0x28 respectively and displays the status on the right h...

Page 9: ... an online description of GUI commands User s Guide opens a PDF version of this document About provides details of the GUI revision The latest version of the SX1231 GUI can be downloaded from the Semtech website Figure 7 Help Menu Options 4 3 Window Toolbar The Windows Toolbar provides three buttons that provide shortcuts to some of the functions accessed from the File drop down menu Figure 8 Wind...

Page 10: ... Connect Disconnect button allows the user to manage manually connection and disconnection of the kit Reset resets the SX1231 configuration registers to the recommended default values Refresh reads the status of all registers Register Window Toggle toggles the SX1231 Registers display window and may also be accessed through the short cut buttons of the Window Toolbar The register display window in...

Page 11: ... to the desired mode Note that the transition between modes is applied as soon as the radio button is accessed When the SX1231 is configured to RX operating mode LED 2 on the USB Bridge is illuminated When the SX1231 is configured to TX mode both LED 2 and LED 3 are illuminated Figure 11 Operating Modes Control Window 4 6 Irq Status Indicator The Irq Status Flag indicator provides an indication of...

Page 12: ...d all registers are updated as soon as they are written It is recommended to cycle through Standby Mode when changing the contents of configuration registers 5 1 Common Configuration Registers Tab The Common Configuration Registers tab is illustrated on the following page in Figure 13 Please refer to the SX1231 for a full description of the configuration register functions ...

Page 13: ...l be highlighted by a red background and the GUI will automatically flag a warning exclamation and the dialog box will be highlighted in red Hovering a mouse or cursor over the warning provides an explanation for the flag as illustrated in Figure 14 Values entered manually that do not coincide with an exact configuration will be automatically updated by the GUI to the next valid register configura...

Page 14: ...be selected from the drop down menus within the tab or entered manual within the tab fields If values are entered manually that do not coincide with an exact configuration the GUI will automatically update the displayed value to the next valid register configuration and write that value to the appropriate configuration register It should be noted that the output power settings are the nominal valu...

Page 15: ...lly update the displayed value to the next valid register configuration and write that value to the appropriate configuration register Figure 17 Receiver Configuration Register Tab Note that with Auto threshold enabled the RSSI threshold is influenced by the double sideband receiver bandwidth as detailed in the SX1231 datasheet 5 3 1 Rx Bandwidth The Rx Bandwidth RxBw window is illustrated below F...

Page 16: ...C FEI The AFC FEI Frequency Error Indicator window is illustrated below Note that when AFC is activated either AFC auto ON or manually the RF frequency in the General window of the Common Configuration Register Tab does not update although a measure of frequency error can be obtained by clicking on the FEI Read button to verify correct AFC operation Enabling AFC low beta implements a double AFC fu...

Page 17: ...re configure DIO mappings i e Packet Handler operation Please refer to Table 1 and Table 2 below for the available DIO mappings of the SX1231 in continuous and packet mode respectively Mode DIOx Mapping DIO5 DIO4 DIO3 DIO2 DIO1 DIO0 00 01 10 LowBat LowBat AutoMode LowBat LowBat Sleep 11 ModeReady ModeReady 00 ClkOut 01 10 LowBat LowBat AutoMode LowBat Standby 11 ModeReady LowBat ModeReady 00 ClkOu...

Page 18: ...oLevel 01 FifoFull 10 LowBat LowBat LowBat LowBat FifoNotEmpty LowBat FS 11 ModeReady PllLock PllLock AutoMode PllLock PllLock 00 Clkout Timeout FifoFull FifoNotEmpty FifoLevel CrcOk 01 Data Rssi Rssi Data FifoFull PayloadReady 10 LowBat RxReady SyncAddr LowBat FifoNotEmpty SyncAddr RX 11 ModeReady PllLock PllLock AutoMode Timeout Rssi 00 Clkout ModeReady FifoFull FifoNotEmpty FifoLevel PacketSent...

Page 19: ...one byte Note that 0x00 can not be set as for the first byte of the sync word The GUI will prompt with an error message should the user attempt to set 0x00 in the first byte of the sync word 5 5 2 AutoMode Operation Auto Modes defines the enter conditions to start the packet handler and exit conditions to terminate packet handler operation as defined in the SX1231 datasheet 5 5 3 Packet Handler GU...

Page 20: ...w in Figure 25 Note that user is prompted to calibrate the SX1231 temperature sensor by clicking on the Calibrate button to access the temperature calibration dialog box Figure 24 Temperature Calibration Dialog Box When the temperature sensor has been calibrate the temperature as computed by the SX1231 will be displayed Figure 25 Calibrated Temperature Sensor Tab Enter ambient temperature here ...

Page 21: ...s of RegOpMode at Addr 0x01 have changed to 0x04 indicating that the SX1231 has been set to Receiver Mode operation Figure 26 SX1231 Registers Display Window 7 Advanced Operating Modes 7 1 Packet Communications Test To configure the SX1231 to enable a wireless packet communications transfer follow the procedure outlined below 7 1 1 Transmitter Mode Configuration 1 Ensure that the SX1231 is in Stan...

Page 22: ...sters for the payload you wish receive Note that the packet can be configured with Address and or Broadcast nodes enabled or disabled DC free mechanisms CRC and or AES may also be selected The packet handler parameters must be identical for those selected for the transmitter for correct operation The only limitation is that he maximum payload size for the purposes of GUI operation is 66 bytes 4 Cl...

Page 23: ...with Earlier Silicon Revisions The SX1231 GUI is backwards compatible with Rev 2 1 Silicon SX1231 datasheet Revision 2 0 The GUI automatically detects the silicon revision number displaying the chip version in the status bar at the bottom of the GUI Configuration Register Tabs are automatically updated to display register contents pertinent to the chip version Semtech s policy of continual improve...

Page 24: ...andling 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 I...

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