Lantronix PNT-SG3FS Manuale di installazione

PNT-SG3FS GNSS Module

Hardware User Guide

Part Number PMD-00144

Revision A October 2022

PNT-SG3FS GNSS Module Hardware User Guide 2

Intellectual Property

transmitted or reproduced in any form or by any means without the written permission of

Lantronix.

Lantronix is a registered trademark of Lantronix, Inc. in the United States and other countries.

Patented: www.lantronix.com/legal/patents/. Additional patents pending.

Warranty

For details on the Lantronix warranty policy, please go to our web site at

www.lantronix.com/support/warranty/

Contacts

Lantronix, Inc.

48 Discovery, Suite 250

Irvine, CA 92618, USA

Toll Free: 800-526-8766

Phone: 949-453-3990

Fax: 949-453-3995

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,

all warranties of any kind (express, implied or otherwise) regarding title, non-infringement,

fitness, quality, accuracy, completeness, usefulness, suitability or performance of the

information provided herein. Lantronix shall have no liability whatsoever to any user for any

damages, losses and causes of action (whether in contract or in tort or otherwise) in

connection with the user’s access or usage of any of the information or content contained

herein. The information and specifications contained in this document are subject to change

without notice.

PNT-SG3FS GNSS Module Hardware User Guide 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 4

Table of Contents

List of Figures _____________________________________________________________ 6

List of Tables ______________________________________________________________ 7

1. Introduction 8

Overview _________________________________________________________________ 8

2. Power 9

VCC _____________________________________________________________________ 9

VBAT ____________________________________________________________________ 9

VCC_IO __________________________________________________________________ 9

VCC_RF ________________________________________________________________ 10

Power Supply Design Reference______________________________________________ 12

Current Consumption Optimization ____________________________________________ 12

3. Interfaces 13

I2C _____________________________________________________________________ 13

UART ___________________________________________________________________ 13

4. I/O Pins 14

PPS ____________________________________________________________________ 14

WakeUP_________________________________________________________________ 14

nRESET_________________________________________________________________ 14

RF_IN __________________________________________________________________ 15

AntOFF _________________________________________________________________ 15

Reserved ________________________________________________________________ 15

5. Standby Modes 16

6. Front End Management 17

Passive Antenna __________________________________________________________ 17

External LNA _____________________________________________________________ 17

Active Antenna ___________________________________________________________ 18

7. Reference Schematic and BOM 21

Schematic _______________________________________________________________ 21

Bill of Materials ___________________________________________________________ 22

8. Layout Recommendations 23

9. Antenna Recommendations 24

Patch Antenna ____________________________________________________________ 24

PNT-SG3FS GNSS Module Hardware User Guide 5

Chip Antenna _____________________________________________________________ 27

Remote Antenna __________________________________________________________ 27

PNT-SG3FS GNSS Module Hardware User Guide 6

List of Figures

Figure 1: PNT-SG3FS Pin Out____________________________________________________ 8

Figure 2: PNT-SG3FS Minimum Functional Connections ______________________________ 10

Figure 3: VCC_RF Output Supply Filtering _________________________________________ 11

Figure 4: Power Supply Filtering _________________________________________________ 12

Figure 5: Example of SMPS to Improve Current Consumption __________________________ 12

Figure 6: WakeUP Internal Circuitry ______________________________________________ 14

Figure 7: PNT-SG3FS Passive Antenna Connection _________________________________ 17

Figure 8: External LNA Connection _______________________________________________ 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: Parallel Component Pads Position _______________________________________ 23

Figure 14: Bypass Component Pads Position _______________________________________ 23

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

PNT-SG3FS GNSS Module Hardware User Guide 7

List of Tables

Table 1. VCC Voltage Characteristics Against VCC_IO ________________________________ 9

Table 2. VBAT Voltage Characteristics 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

1. Introduction

PNT-SG3FS GNSS Module Hardware User Guide 8

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. The module supports Differential GPS (DGPS) data according to RTCM

10402.3. Assisted GNSS algorithms support extended ephemeris data using local autonomous

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 assisted GNSS, and firmware updates. The PNT-SG3FS module further

integrates a temperature compensated crystal oscillator (TXCO) for navigation performance

and stability, and a real-time clock (RTC) oscillator with a clock-trimming feature to

compensate for the accuracy of the 32.768 kHz crystal in timing applications.

Figure 1 shows the pin out of the module.

Figure 1: PNT-SG3FS Pin Out

2. Power

PNT-SG3FS GNSS Module Hardware User Guide 9

Power

The PNT-SG3FS is supplied with 3 power pins: VCC (pin 8), VCC_IO (pin 7), and VBAT (pin 6).

VCC

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.

Table 1. VCC Voltage Characteristics Against VCC_IO

Symbol Parameter VCC_IO Min Typ Max Unit

VCC Digital supply voltage 1.8 1.755 1.8 4.2 V

VCC Digital supply voltage 3.3 3.0 3.3 4.2 V

During startup or low power application, current can change suddenly. It is important that supply

IC can provide this current variability.

VBAT

VBAT (pin 6) is the supply for the low-power domain backup: backup 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 voltage of VCC_IO, as shown in Table 2 below.

Table 2. VBAT Voltage Characteristics Against VCC_IO

Symbol Parameter VCC_IO Min Typ Max Unit

VBAT Backup input supply

voltage

1.8 1.755 1.8 4.2 V

VBAT Backup input supply

voltage

3.3 3.0 3.3 4.2 V

VCC_IO

The VCC_IO (pin 7) voltage range is shown in Table 3 below.

Table 3. VCC_IO Supported Voltage Range

Symbol Parameter Min Typ Max Unit

VCC_IO IO supply voltage 1.755 1.8 1.98 V

VCC_IO IO supply voltage 3.0 3.3 3.6 V

2. Power

PNT-SG3FS GNSS Module Hardware User Guide 10

Note: 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.

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

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