Related Manuals for Lantronix PNT-SG3FS
Summary of Contents for Lantronix PNT-SG3FS
- Page 1 PNT-SG3FS GNSS Module Hardware User Guide Part Number PMD-00144 Revision A October 2022...
- Page 2 Technical Support Online: www.lantronix.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,...
- Page 3 Revision History Date Rev. Comments October 2022 Initial release. For the latest revision of this product document, please check our online documentation at www.lantronix.com/support/documentation. PNT-SG3FS GNSS Module Hardware User Guide...
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Page 4: Table Of Contents
Passive Antenna __________________________________________________________ 17 External LNA _____________________________________________________________ 17 Active Antenna ___________________________________________________________ 18 7. Reference Schematic and BOM Schematic _______________________________________________________________ 21 Bill of Materials ___________________________________________________________ 22 8. Layout Recommendations 9. Antenna Recommendations Patch Antenna ____________________________________________________________ 24 PNT-SG3FS GNSS Module Hardware User Guide... - Page 5 Chip Antenna _____________________________________________________________ 27 Remote Antenna __________________________________________________________ 27 PNT-SG3FS GNSS Module Hardware User Guide...
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Page 6: List Of Figures
Figure 15: Antenna and PNT-SG3FS - Opposite Placement ___________________________ 24 Figure 16: Patch Antenna and PNT-SG3FS, Opposite Side Placement Example ___________ 25 Figure 17: 25×25mm SMD Antenna and PNT-SG3FS, Same Side Placement Example ______ 26 Figure 18: Chip Antenna and PNT-SG3FS, Same Side Layout Example __________________ 27... -
Page 7: List Of Tables
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 PNT-SG3FS GNSS Module Hardware User Guide... -
Page 8: Introduction
Introduction Overview This document is relevant to PNT-SG3FS, a Global Navigation Satellite System (GNSS) standalone module with an integrated Teseo III receiver from ST Microelectronics. The multi- constellation receiver can track up to 32 satellite signals in view across GPS L1C/A, BeiDou B1, Galileo E1B/C, GLONASS L1OF, SBAS L1C/A (WAAS, EGNOS, MSAS, GAGAN), and QZSS L1C/A bands. -
Page 9: Power
2. Power Power The PNT-SG3FS is supplied with 3 power pins: VCC (pin 8), VCC_IO (pin 7), and VBAT (pin 6). VCC (pin 8) is the main supply. The VCC voltage range differs depending on the voltage of VCC_IO, as shown in Table 1 below. -
Page 10: Vcc_Rf
VCC_IO must be equal to or lower than VCC and VBAT. Refer to Table 14-1 and Table 14-2 in PNT-SG3FS datasheet for associated limits. Figure 2 below shows the minimum functional connections needed for the PNT-SG3FS. Figure 2: PNT-SG3FS Minimum Functional Connections... -
Page 11: Figure 3: Vcc_Rf Output Supply Filtering
2. Power Figure 3: VCC_RF Output Supply Filtering PNT-SG3FS GNSS Module Hardware User Guide... -
Page 12: Power Supply Design Reference
85%. MODE 2.3V – 5.5V ST1S15J18R 4.7µF 470nH LQM21PNR47MC0D 4.7µF Figure 5: Example of SMPS to Improve Current Consumption If VCC_IO is also supplied via an SMPS, this will enable the lowest current consumption. PNT-SG3FS GNSS Module Hardware User Guide... -
Page 13: Interfaces
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 ♦... -
Page 14: I/O Pins
PPS (pin 4) is the time pulse every one second. It can be configured with different conditions of pulses. WakeUP WakeUP (pin 5) is an external interrupt used to wake up the PNT-SG3FS for asynchronous wake- up during standby. If not used, leave it floating. -
Page 15: Rf_In
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. PNT-SG3FS GNSS Module Hardware User Guide... -
Page 16: Standby Modes
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 guide for more information on these standby modes. -
Page 17: Front End Management
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. -
Page 18: Active Antenna
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. PNT-SG3FS GNSS Module Hardware User Guide... -
Page 19: Figure 9: Active Antenna With Current Switch Control
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 PNT-SG3FS GNSS Module Hardware User Guide... - Page 20 # 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 PNT-SG3FS GNSS Module Hardware User Guide...
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Page 21: Reference Schematic And Bom
7. Reference Schematic and BOM Reference Schematic and BOM Schematic Figure 11: General Schematic PNT-SG3FS GNSS Module Hardware User Guide... -
Page 22: Bill Of Materials
GNSS Receiver - Low power Teseo III flash-based GPS Galileo Lantronix PNT-SG3FS SG3FS GLONASS BeiDou QZSS Receiver BGA725L6 Low Noise Amplifier for GPS, GLONASS, Galileo and Compass Infineon BGA725L6 BGA725L6 B4327 Automotive SAW RF filter for GPS+COMPASS+GLONASS Epcos B39162B4327P810 PNT-SG3FS GNSS Module Hardware User Guide... -
Page 23: Layout Recommendations
PNT-SG3FS. Figure 12: PNT-SG3FS PCB layout example It is important to have a whole ground plane below the PNT-SG3FS module. For RF-passive components, 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. -
Page 24: Antenna Recommendations
Larger antennas provide better performance. Patch Antenna on the Opposite Side of the PNT-SG3FS Patch 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. -
Page 25: Figure 16: Patch Antenna And Pnt-Sg3Fs, Opposite Side Placement Example
Figure 16 below shows an example layout with the 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. -
Page 26: Figure 17: 25×25Mm Smd Antenna And Pnt-Sg3Fs, Same Side Placement Example
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 Placement Example PNT-SG3FS GNSS Module Hardware User Guide... -
Page 27: Figure 18: Chip Antenna And Pnt-Sg3Fs, Same Side Layout Example
If using a passive remote antenna, it is recommended to mount the external LNA + SAW filter in front of the PNT-SG3FS, and to use a short coaxial cable. Each dB lost in the cable will in turn result in lost sensitivity capability.
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