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AsteRx-m2 Product Group
Hardware Manual

Version 1.5.0

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Summary of Contents for AsteRx-m2

Page 1: ...AsteRx m2 Product Group Hardware Manual Version 1 5 0 ...

Page 2: ...ware Manual Version 1 5 0 June 12 2020 Copyright 2000 2020 Septentrio nv sa All rights reserved Septentrio Greenhill Campus Interleuvenlaan 15i 3001 Leuven Belgium http www septentrio com Phone 32 16 300 800 Fax 32 16 221 640 septentrio ...

Page 3: ... 1 30 pin Connector 12 2 5 2 60 pin connector 13 2 6 External Frequency Reference Input REF IN 15 2 7 Event TimeSync inputs 15 2 8 General Purpose Output GPx 15 2 9 Standby Mode 16 2 10 SD Memory Card Usage 16 2 11 USB Interface 17 2 12 Ethernet 17 3 DEVELOPMENT KIT 19 3 1 Header Types 19 3 2 Powering the DevKit 19 3 3 Antenna Connectors 20 3 4 LEDs and General Purpose Output Pins 21 3 5 COM Ports...

Page 4: ...4 4 4 3 8 USB Dev 23 3 9 USB Host 23 3 10 REF IN 23 3 11 Buttons 23 3 12 SD Card Socket 24 APPENDIX A LED STATUS INDICATORS 25 APPENDIX B EMC CONSIDERATIONS 27 ...

Page 5: ...o see www septentrio com en environmental compliance ESD PRECAUTIONS The OEM module is sensitive to electrostatic discharge ESD Although it has a limited protection it should only be manipulated in an ESD safe environment and using ESD safe tools and equipment These tools are typically marked with the following symbol ...

Page 6: ... AsteRx m2 OEM 6 2 AsteRx m2 OEM All dimensions in millimeters Weight 28 g RF connectors u FL type are mounted on top side of the PCB The 30 and 60 pin Hirose I O connectors are mounted on the bottom side ...

Page 7: ... 3 3V 5 The power consumption depends on the set of GNSS signals enabled with the setSignalTracking command The following table shows the typical power consumption for selected sets of signals when computing a standalone position at a 1 Hz rate Signals enabled with setSignalTracking Power consumption Measurement conditions GPSL1CA 620 mW 12 sats in tracking GPSL1CA GPSL2P 740 mW 12 sats in trackin...

Page 8: ...etAntennaConnector command Note that in the command line interface the ANTA u FL connector is referred to as Int for internal antenna and the ANTB connector is referred to as Ext for external antenna The table below summarizes the different configurations Setting in setAntennaConnector command RF signal source auto default ANTB if current 6mA ANTA otherwise Ext ANTB Int ANTA If the antenna is not ...

Page 9: ...4 2 System Noise Figure and C N0 The system noise figure in dB can be calculated as NFsys 10 log10 10NFant 10 10NFrx 10 1 10Gpreamp 10 where NFant is the antenna LNA noise figure in dB NFrx is the receiver noise figure in dB See table above Gpreamp is the net gain in front of the receiver in dB For example with a 2 5 dB antenna LNA noise figure 30 dB antenna LNA gain and 15 dB cable loss Gpreamp 3...

Page 10: ...10 10 AsteRx m2 OEM 10 Note that when connecting the receiver directly to a GNSS simulator the applicable value for NFrx is that of a passive antenna 4 5dB Tant 290K NFant 0dB and Gpreamp 0dB ...

Page 11: ...the first 300 ms after these states The IO_EN pin of the 60 pin connector indicates when the board is ready to accept input and can be used to enable the drivers driving the input pins Designs not using the 60 pin connector must either keep the input pins in hi Z mode for at least 300 ms after applying power or drive the nRST pin low for at least 300 ms after applying power When not using the IO_E...

Page 12: ...ging status indicator Max output current 10 mA output impedance 20 Ohms See Appendix A 29 GND Gnd 0 Ground Pin Name Type Level Description Comment 2 Vin P 3 3V 5 Main power supply input Both Vin pins pin 1 and pin 2 must be tied together 4 GND Gnd 0 Ground 6 USB_D I O USB USB data signal negative D 8 nRST Ctrl PU LVTTL Reset input active negative Receiver resets when driven low 10 RX1 I K LVTTL Se...

Page 13: ...when ready to receive data 15 TX4 O LVTTL Serial COM 4 transmit line inactive state is high 17 Reserved 19 Reserved 21 Reserved 23 Reserved 25 Reserved 27 Reserved 29 GND Gnd Ground 31 RMII_TXEN O LVTTL LAN PHY transmit enable See section 2 12 33 RMII_TXD1 O LVTTL LAN PHY transmit data 1 See section 2 12 35 RMII_CRS_DV I LVTTL LAN PHY CRS See section 2 12 37 RMII_RXER I LVTTL LAN PHY RX error See ...

Page 14: ...8 Reserved 30 GND Gnd Ground 32 RMII_CLK O LVTTL LAN PHY Clock See section 2 12 34 RMII_TXD0 O LVTTL LAN PHY transmit data 0 See section 2 12 36 GND Gnd Ground 38 RMII_RXD0 I LVTTL LAN PHY receive data 0 See section 2 12 40 RMII_RXD1 I LVTTL LAN PHY receive data 1 See section 2 12 42 GND Gnd Ground 44 GP2 O LVTTL General purpose output GP2 in setGPIOFunctionality command See section 2 8 46 Reserve...

Page 15: ...olarity Note that this feature requires the TimedEvent permission to be enabled in the receiver If the TimeSync permission is enabled the event inputs can also be configured as TimeSync source using the setTimeSyncSource command When an event pin is configured as TimeSync source the AsteRx m2 expects to see a one pulse per second 1PPS signal on that pin It will then synchronize its internal time b...

Page 16: ...rMode StandBy user command To wake up the nPDN pin should be shortly driven low at least for 50ms It is also possible to schedule automatic standby wakeup periods using the setWakeUpInterval command Note that entering standby mode takes a few seconds during which all running processes are shutdown 2 10 SD Memory Card Usage The receiver can interface to an external SD memory card through the SD car...

Page 17: ...eiver 2 By driving the button pin pin 25 low for at least 5 seconds before turning off the receiver 2 11 USB Interface The user can configure the USB device interface in either USB 1 1 full speed mode or in USB 2 0 high speed mode USB 2 0 allows higher bandwidth 480 Mbps vs 12 Mbps but may not be supported by all host hardware By default USB is configured in USB 1 1 mode The update files AsteRx m2...

Page 18: ...18 18 AsteRx m2 OEM 18 ...

Page 19: ...re two ways to power the DevKit 1 From the USB Dev connector J205 This allows powering the board from a PC or from a standard phone charger adapter The supported USB voltage range is 4 5V 5 5V 2 Using the POWER connector J203 The supported voltage range is 5 36V When powering from the USB Dev connector it is recommended to use the USB cable provided with the DevKit Low quality USB cables often suf...

Page 20: ... and connect the two pins to the probes of a multimeter in current sensing mode Measure the current flowing between the two pins and multiply it by 3 3V to obtain the power consumption It is recommended to set the multimeter in high ampere setting to keep the voltage drop as low as possible 3 3 Antenna Connectors There is no antenna connector on the DevKit The antenna must be connected directly to...

Page 21: ... pins of the 30 pin connector of the AsteRx m2 board See section 2 5 1 for the pinout and Appendix A for a description of the LED behavior The 3 3V GP1 and GP2 outputs are available on the J501 header 3 5 COM Ports By default the four COM ports of the AsteRx m2 are routed to the four DB9 connectors Electrical levels on the BD9 conform to the RS232 standard RTS CTS lines are supported only on COM2 ...

Page 22: ...o the 6 pin header The other COM ports are still routed to the DB9 connectors using the RS232 levels 3 6 PPS Out and Event Inputs The PPSout pin of header J500 is directly connected to the PPSOut pin of the AsteRx m2 see section 2 5 1 The PPS level is 3 3V The EVENTA and EVENTB pins of J500 are connected to the EventA and EventB pins of the AsteRx m2 through a buffer The voltage level at the heade...

Page 23: ...l 10 MHz sinusoidial frequency reference See section 2 6 Input impedance 50 Input level between 10dBm and 14dBm 0 2Vpp to 3 2Vpp 3 11 Buttons Pressing the nRST button drives the nRST pin of the AsteRx m2 low which resets the receiver Pressing the LOGGING button drives the Button pin of the AsteRx m2 low This can be used to enabled and disable logging as described in section 2 10 The buttons are al...

Page 24: ...24 24 Development Kit 24 3 12 SD Card Socket The receiver can log files on the micro SD Card in this socket See section 2 10 for a description of the SD Card logging ...

Page 25: ...or which differential corrections have been provided in the last received differential correction message RTCM or CMR LED behaviour Number of satellites with corrections LED is off No differential correction message received blinks fast and continuously 10 times per second 0 blinks once then pauses 1 2 blinks twice then pauses 3 4 blinks 3 times then pauses 5 6 blinks 4 times then pauses 7 8 blink...

Page 26: ... activity LED LED Behaviour LOGLED LED is off when the SD card is not present or not mounted LED is on when the SD card is present and mounted Short blinks indicate logging activity During boot i e during the first seconds after powering the receiver the state of the LEDs is not defined ...

Page 27: ...ions the C N0 values should reach up to 50 dB Hz for the strong signals on L1 and L5 and up to 45 dB Hz on L2 as illustrated below If the maximum C N0 is lower than expected interference and cross talk from nearby electronics is likely and the source of the problem needs to be identified This is where the RF spectrum monitor built in the AsteRx m2 comes in handy The spectrum monitor can be accesse...

Page 28: ...band and slightly degrades the L1 C N0 of some GLONASS satellites Try to keep personal computers and other equipment more than 2 meters away from the antenna while assessing electromagnetic compatibility of the integration RxControl also allows to observe the time domain signal This should look like white Gaussian noise as illustrated below ...

Page 29: ... and the system frequencies For example peaks at 1200 and 1248 MHz are an indication of an interfering source at 48 MHz as this maps to the 25th and 26th harmonic of a 48 MHz signal This may correspond to the frequency of a microcontroller in the application Integration cross talk can be solved in a number of ways Shift the clock frequency of the interfering signal to avoid the GNSS bands Use shie...

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