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Lantronix PNT-SG3FS, Hardware User'S Manual

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Lantronix PNT-SG3FS Hardware User'S Manual Download Page 19

 

 

6. Front End Management 

PNT-SG3FS GNSS Module Hardware User Guide 

19 

 

Figure 9: Active Antenna with Current Switch Control 

 
To improve the functionality, a current limiter like that shown in Figure 10 below can be used.  
 

 

Figure 10: Active Antenna Current Sense Without On-Module Antenna Sensing 

 

 

Summary of Contents for PNT-SG3FS

Page 1: ...PNT SG3FS GNSS Module Hardware User Guide Part Number PMD 00144 Revision A October 2022 ...

Page 2: ... com support Sales Offices For a current list of our domestic and international sales offices go to the Lantronix web site at www lantronix com about us contact Disclaimer All information contained herein is provided AS IS Lantronix undertakes no obligation to update the information in this publication Lantronix does not make and specifically disclaims all warranties of any kind express implied or...

Page 3: ...le Hardware User Guide 3 Revision History Date Rev Comments October 2022 A Initial release For the latest revision of this product document please check our online documentation at www lantronix com support documentation ...

Page 4: ..._______________________________________ 13 4 I O Pins 14 PPS ____________________________________________________________________ 14 WakeUP_________________________________________________________________ 14 nRESET_________________________________________________________________ 14 RF_IN __________________________________________________________________ 15 AntOFF __________________________________...

Page 5: ...PNT SG3FS GNSS Module Hardware User Guide 5 Chip Antenna_____________________________________________________________ 27 Remote Antenna __________________________________________________________ 27 ...

Page 6: ...___________________________________________ 18 Figure 9 Active Antenna with Current Switch Control_________________________________ 19 Figure 10 Active Antenna Current Sense Without On Module Antenna Sensing____________ 19 Figure 11 General Schematic ___________________________________________________ 21 Figure 12 PNT SG3FS PCB layout example _______________________________________ 23 Figure 13 Pa...

Page 7: ...s Against VCC_IO _______________________________ 9 Table 3 VCC_IO Supported Voltage Range _________________________________________ 9 Table 4 PNT SG3FS Carrier BOM _______________________________________________ 22 Table 5 PNT SG3FS Compatible Patch Antennas Opposite Side Mount ________________ 24 Table 6 PNT SG3FS Compatible Patch Antennas Same Side Mount ___________________ 26 ...

Page 8: ...nomous or server assisted based solutions for fast Time to First Fix TTFF operation The module can output measurement data carrier phase supporting RTK PPP client algorithms for precise positioning applications The module supports 1 8V or 3 3V power supply domains and an embedded 16Mb flash memory that enables support for many features including data logging geofencing odometer 5 day autonomous as...

Page 9: ...RAM and RTC VBAT can be either connected to VCC or it can be connected to a dedicated always on power supply Supplying power to VBAT during low power mode enables fast recovery of GNSS fix VBAT prevents current flow when VBAT is lower than VCC This is important when VBAT is supplied with a small battery especially if the battery is not rechargeable The VBAT voltage range differs depending on the v...

Page 10: ...or associated limits Figure 2 below shows the minimum functional connections needed for the PNT SG3FS VCC_RF VCC_RF pin 14 is an output image of VCC with filtering for LNA or active antenna supply as shown in Figure 3 below It can be filtered to remove high frequency noise This filtering can be planned and not mounted Figure 2 PNT SG3FS Minimum Functional Connections ...

Page 11: ...2 Power PNT SG3FS GNSS Module Hardware User Guide 11 Figure 3 VCC_RF Output Supply Filtering ...

Page 12: ... capacitor footprint and not the inductor Figure 4 Power Supply Filtering Current Consumption Optimization Use of an SMPS at 1 8V to supply VCC is recommended to optimize current consumption Figure 5 is an application example with an external switching voltage regulator in order to achieve an efficiency around 85 Figure 5 Example of SMPS to Improve Current Consumption If VCC_IO is also supplied vi...

Page 13: ... mode UART The UARTs Universal Asynchronous Receiver Transmitter pins 2 3 support many of the same functions as the industry standard 16C650 UART The PNT SG3FS UARTs vary from the 16C650 on some minor points Receive FIFO trigger levels Internal register map address space and bit function of each register Deltas of modem status signals are not available 1 5 stop bits are not supported Independent r...

Page 14: ... asynchronous wake up during standby If not used leave it floating Internal circuitry shown in Figure 6 below is done with resistor bridge to ensure 1V 0 25V level Take care to not change the resistor bridge value to be outside of this 0 75V 1 25V range Figure 6 WakeUP Internal Circuitry nRESET nRESET pin 9 can force a PNT SG3FS under reset Reset signal is active low The host processor must have f...

Page 15: ...resent in the RF input Decoupling capacitor inside AntOFF AntOFF pin 13 is a GPIO used to switch OFF external LNA or switch OFF current for the active antenna A 10kOhm pull down is necessary to ensure a low level during standby period Reserved Pins 15 and 18 are reserved and both must be left floating ...

Page 16: ...eacquisition at the end of the standby time due to RTC The PNT SG3FS offers three different standby modes Hardware OFF standby Hardware standby Software standby As IO buffers are not supplied during standby mode it is important to keep all IO without external voltage to avoid any current leakage UART RX is an exception that can be left high Please refer to the PNT SG3FS datasheet and software user...

Page 17: ...close to the module In addition an impedance matching component might be necessary to match the antenna Figure 7 PNT SG3FS Passive Antenna Connection External LNA External LNA means a passive antenna used with an LNA on the same PCB as the PNT SG3FS module To optimize power consumption during low power mode if needed the LNA should have an enable pin compatible with VCC_IO to be switched OFF ON Fi...

Page 18: ...re User Guide 18 Figure 8 External LNA Connection Active Antenna PNT SG3FS Module Without Current Sensing To optimize current during low power operating mode the active antenna can be used with a switch to cut the current flow as shown in Figure 9 below ...

Page 19: ...le Hardware User Guide 19 Figure 9 Active Antenna with Current Switch Control To improve the functionality a current limiter like that shown in Figure 10 below can be used Figure 10 Active Antenna Current Sense Without On Module Antenna Sensing ...

Page 20: ...on the antenna use the antenna detect configuration script GPIO High Low status 206 fffffeff 207 00000000 Activate and configure antenna sensing 226 3483F01F Antenna status message 228 00020010 Configure GPIO 242 18140008 243 01030001 244 00000101 GPIO alternate function 253 FFF7C3F0 254 00100000 ...

Page 21: ...7 Reference Schematic and BOM PNT SG3FS GNSS Module Hardware User Guide 21 7 Reference Schematic and BOM Schematic Figure 11 General Schematic ...

Page 22: ...21PNR47MC0D L2 5n6H Surface mount wire wound inductor 5n6H 3 0 76A Coilcraft 0402CS 5N6XJLU Murata LQW15AN5N6G80D 00 21 L3 27nH Unshielded Multilayer Inductor 27nH 350mA 460 mOhm Max 0402 1005 Metric Murata LQG15HS27NJ02 TDK MLG1005S27NJT000 C6 C8 C9 C10 C11 NM 56pF surface mount general purpose multilayer ceramic chip capacitor COG 0201 50V 2 Murata GRM0335C1H560GA01 TDK CGA1A2C0G1H560J030BA R1 1...

Page 23: ...nts use of 0402 1 x 0 5mm components is recommended Please choose the RF ground layer to be able to get 50ohms RF line width as close as possible to the component pads On 50ohms RF line it is important to avoid all possible stubs For parallel components place one pad on the RF line 50Ω line 50Ω line 50Ω line Figure 13 Parallel Component Pads Position If a bypass is needed superimpose the two pads ...

Page 24: ... antennas can be pin soldered on the opposite side of the PCB as the PNT SG3FS and other RF components as shown in Figure 15 below Figure 15 Antenna and PNT SG3FS Opposite Placement Table 5 below provides information on compatible patch antennas opposite side mount Manufacturer Part Number Constellation Size Taoglas CGGBP 25 4 A 02 GPS Glonass Beidou 25 25mm Taoglas CGGBP 25 2 A 02 GPS Glonass Bei...

Page 25: ...e antenna mounted on the opposite side of the components Figure 16 Patch Antenna and PNT SG3FS Opposite Side Placement Example On the antenna side there is only a ground pad as large as the antenna with one big via for the antenna pin Antenna performance will improve if the ground plane is larger than the antenna size ...

Page 26: ...out example with the antenna and components mounted on the same side Table 6 PNT SG3FS Compatible Patch Antennas Same Side Mount Manufacturer Part Number Constellation Size Taoglas SGGP 25 4 A 02 GPS GLONASS 25 25mm Taoglas SGGP 18 4 A 02 GPS GLONASS 18 18mm Yageo ANT1818B00BT1516S GPS GLONASS 18 18mm Yageo ANT2525B00BT1516S GPS GLONASS 25 25mm Figure 17 25 25mm SMD Antenna and PNT SG3FS Same Side...

Page 27: ...A 01 A GPS Glonass Beidou mounted on the edge of the PCB Figure 18 Chip Antenna and PNT SG3FS Same Side Layout Example Follow the Layout Recommendationsin Chapter 8 for better performance Remote Antenna A remote antenna installation means the antenna is connected to the PNT SG3FS via an RF connector If using an active antenna there is no need to mount LNA on the PCB If using a passive remote anten...

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