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Summary of Contents for Telit Wireless Solutions SC872-A
- Page 1 SC872-A Product User Guide 1VV0301202 Rev. 6 2019-12-05...
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Page 2: Notices
SC872-A Product User Guide Notices SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE NOTICES While reasonable efforts have been made to ensure the accuracy of this document, Telit assumes no liability resulting from any inaccuracies or omissions in this document, or from use of the information obtained herein. -
Page 3: Usage And Disclosure Restrictions
SC872-A Product User Guide Notices USAGE AND DISCLOSURE RESTRICTIONS License Agreements The software described in this document is the property of Telit and its licensors. It is furnished by express license agreement only and may be used only in accordance with the terms of such an agreement. -
Page 4: Product Applicability Table
SC872-A Product User Guide Product Applicability Table PRODUCT APPLICABILITY TABLE PRODUCT SC872-A Table 0-1 Product Applicability Table 1VV0301202 Rev. 6 Page 4 of 53 2018-12-21... -
Page 5: Table Of Contents
Related Documents Requiring a Non-Disclosure Agreement ........10 PRODUCT DESCRIPTION ................... 11 Product Overview ...................... 11 Block Diagram ......................12 SC872-A Block Diagram ..................12 Product Pictures ......................13 EVALUATION KIT ......................14 PRODUCT FEATURES ....................16 Multi-Constellation Navigation ................... 16 Quasi-Zenith Satellite System (QZSS) .............. - Page 6 Proprietary Output Messages ................. 28 NMEA Input Commands.................... 29 NMEA Commands List .................... 29 FLASH UPGRADABILITY .................... 30 ELECTRICAL INTERFACE ..................31 Module Pinout – SC872-A ..................31 DC Power Supply ...................... 32 VCC ........................32 Battery ........................32 DC Power Requirements ..................32 DC Power Consumption ..................
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Page 7: Tables
SC872-A Product User Guide Contents MECHANICAL DRAWINGS ..................39 Ground Plane ......................39 SC872-A Mechanical Drawings ................. 40 PACKAGING & HANDLING ..................41 Product Marking and Serialization ................41 Product Packaging ....................42 Moisture Sensitivity ....................43 Disposal ........................45 Safety........................ -
Page 8: Figures
Figure 2-1 SC872-ABlock Diagram ...................12 Figure 2-2 SC872-A Pictures ....................13 Figure 3-1 Evaluation Kit contents ....................14 Figure 3-2 SC872-A Evaluation Unit ..................15 Figure 4-1Jamming Rejection ....................18 Figure 4-2 GNSS Low Power (GLP) mode diagram ..............20 Figure 4-3 Periodic Modes diagram ..................21 Figure 4-4 Periodic Mode example 1 ..................21... -
Page 9: Introduction
SC872-A Product User Guide Introduction 1 INTRODUCTION Purpose The purpose of this document is to provide information regarding the function, features, and usage of the Telit products listed in Table 0-1 Product Applicability Table Contact and Support Information For general contact, technical support services, technical questions, and to report documentation errors contact Telit Technical Support at: TS-EMEA@telit.com... -
Page 10: Related Publications And Downloads
SC872-A Product User Guide Introduction Related Publications and Downloads Please see http://www.telit.com/gnss/ for current documentation and downloads Related Documents and downloads Datasheets • Product User Guides • • EVK User Guides Software User Guides • • Application Notes TelitView installation and documentation •... -
Page 11: Product Description
Product Description 2 PRODUCT DESCRIPTION The SC872-A is an integrated GNSS receiver module using a state of the art GNSS engine (MT3333) and includes a built-in GNSS antenna. It features a 4-pin connector for easy installation. It provides a complete position, velocity, and time (PVT) engine featuring high performance, high sensitivity, and low power consumption. -
Page 12: Block Diagram
SC872-A Product User Guide Product Description Block Diagram SC872-A Block Diagram Figure 2-1 SC872-ABlock Diagram 1VV0301202 Rev. 6 Page 12 of 53 2018-12-21... -
Page 13: Product Pictures
SC872-A Product User Guide Product Description Product Pictures Top (antenna) Bottom Figure 2-2 SC872-A Pictures 1VV0301202 Rev. 6 Page 13 of 53 2018-12-21... -
Page 14: Evaluation Kit
SC872-A Product User Guide Evaluation Kit EVALUATION KIT The SC872-A Evaluation Kit (EVK) is available to assist in the evaluation and integration of the receiver module in custom applications. The EVK contains the necessary items to complete an evaluation of the module. -
Page 15: Figure 3-2 Sc872-A Evaluation Unit
SC872-A Product User Guide Evaluation Kit Figure 3-2 SC872-A Evaluation Unit 1VV0301202 Rev. 6 Page 15 of 53 2018-12-21... -
Page 16: Product Features
SC872-A Product User Guide Product Features 4 PRODUCT FEATURES Multi-Constellation Navigation GPS and GLONASS constellations are enabled by default. If BeiDou is enabled, GLONASS and Galileo are disabled. The user may enable or disable constellations via the $PMTK353 command Quasi-Zenith Satellite System (QZSS) -
Page 17: Server-Generated Agps - Extended Prediction Orbit (Epo)
SC872-A Product User Guide Product Features Server-generated AGPS - Extended Prediction Orbit (EPO) Server-generated ephemeris predictions are maintained on Telit AGPS servers. The predicted ephemeris file is obtained from the AGPS server and is transmitted to the module over a serial port. -
Page 18: Internal Lna
SC872-A Product User Guide Product Features levels (e. g. –90 to –80 dBm), the RF signal sampling ADC starts to become saturated after which the GNSS signal levels start to diminish. Jamming rejection is enabled by default, but can be disabled with the PMTK286 command. -
Page 19: Power Management Modes
SC872-A Product User Guide Product Features Power Management Modes The receiver supports operating modes that reduce overall current consumption with less frequent position fixes. Availability of GNSS signals in the operating environment will be a factor in choosing power management modes. The designer can choose a mode that provides the best trade-off of navigation performance versus power consumption. -
Page 20: Backup Mode (Perpetual)
Product Features Backup Mode (Perpetual) Do not enter the Perpetual Backup mode. The SC872-A modules do not have a Force_On pin, and a power cycle will be required to return to normal operation. Standby Modes In these modes, the receiver stops navigation, the internal processor enters the standby state, and the current drain at main supply VCC_IN is substantially reduced. -
Page 21: Periodic Modes
SC872-A Product User Guide Product Features Periodic Modes These modes allow autonomous power on/off control with reduced fix rate to decrease average power consumption. The main power supply pin VCC_ON is still powered, but power distribution to internal circuits is internally controlled by the receiver. -
Page 22: Alwayslocate™ Modes
SC872-A Product User Guide Product Features To enter a Periodic mode, send the following NMEA command(s): $PMTK223 ,<SV>,<SNR>,<Extension threshold>,<Extension gap>*<checksum> ( Optional) Where: SV = 1 to 4, default = 1 SNR = 25 to 30, default = 28 Ext. threshold = 40 000 to 180 000 ms, default = 180 000 Ext. -
Page 23: Data Retention
SC872-A Product User Guide Data Retention 5 DATA RETENTION The receiver is capable of retaining data elements under the various initialization types. If Vcc is maintained, no data will be lost. If Vcc is removed, the battery will maintain power until it is exhausted. If the battery is exhausted Vcc may need an additional power cycle to properly boot. -
Page 24: Product Performance
SC872-A Product User Guide Product Performance 6 PRODUCT PERFORMANCE Performance – SC87x-A Horizontal Position Accuracy Horizontal Position Accuracy Constellation(s) CEP (m) Glonass GPS + Glonass Test Conditions: 24-hr Static, -130 dBm, Full Power mode. Table 6-1 Horizontal Position Accuracy Time to First Fix... -
Page 25: Sensitivity
SC872-A Product User Guide Product Performance Sensitivity Constellation State Signal Level (dBm) Acquisition -145 Navigation -156 Tracking -157 Acquisition -143 GLONASS Navigation -153 Tracking -157 Acquisition -143 GPS + GLO Navigation -153 Tracking -156 Test Conditions: Internal LNA used GNSS radiating antenna at 50cm distance. -
Page 26: Jamming Mitigation Performance Example
SC872-A Product User Guide Product Performance Jamming Mitigation Performance example Figure 6-1 Jamming with AIC Disabled Figure 6-2 Jamming with AIC Enabled 1VV0301202 Rev. 6 Page 26 of 53 2018-12-21... -
Page 27: Message Interface
SC872-A Product User Guide Message Interface 7 MESSAGE INTERFACE Serial I/O port (RX and TX pins) supports full duplex communication between the receiver and the user. The default serial configuration is: NMEA, 9600 bps, 8 data bits, no parity, 1 stop bit. -
Page 28: Proprietary Output Messages
SC872-A Product User Guide Message Interface The following table shows the Talker IDs used: Talker ID Constellation BeiDou Galileo GLONASS QZSS Table 7-3 NMEA Talker IDs Proprietary Output Messages The modules support several proprietary NMEA output messages which report additional receiver data and status information. -
Page 29: Nmea Input Commands
SC872-A Product User Guide Message Interface NMEA Input Commands The modules use NMEA proprietary messages for commands and command responses. This interface provides configuration and control over selected firmware features and operational properties of the module. Wait time is about 50 to 100 ms. -
Page 30: Flash Upgradability
SC872-A Product User Guide Flash Upgradability 8 FLASH UPGRADABILITY Please refer to the product EVK User Guide for more detailed information. The firmware stored in the internal Flash memory of the module may be upgraded via the serial port TX/RX pins. In order to update the FW, the following steps should be performed to re- program the module. -
Page 31: Electrical Interface
SC872-A Product User Guide Electrical Interface 9 ELECTRICAL INTERFACE Module Pinout – SC872-A Connector (Input / Output & Power): 1.25 mm (0.049”) pitch, surface mount type PN: Yeonho Electronics Co., Ltd. www.yeonho.com Wafer12505WR-04 Housing 12505HS-04 Matching terminal 12505TS Figure 9-1 SC872-A Pin-out 1VV0301202 Rev. -
Page 32: Dc Power Supply
Electrical Interface DC Power Supply SC872-A modules have one power supply pin – Vcc.. The modules require a Vcc main DC power supply as specified below. Power must be within specification within 10ms of initial application. Slower ramping may cause the module to fail to start up. -
Page 33: Dc Power Consumption
SC872-A Product User Guide Electrical Interface DC Power Consumption State & Constellation Units Acquisition GPS Only Glonass Only GPS and Glonass Navigation/Tracking GPS Only Glonass Only GPS and Glonass Low Power - Always Locate (Standby) GPS Only GPS and (Glonass or BeiDou) Table 9-2 Power Consumption 1VV0301202 Rev. -
Page 34: Digital Interface Signals
SC872-A Product User Guide Electrical Interface Digital Interface Signals UART TX Usage TX: NMEA message output RX: NMEA proprietary commands, RTCM SC-104 input and EPO data. TX/RX is also used to Re-flash the module UART Port Operation The UART port is full-duplex and supports configurable baud rates. -
Page 35: Built-In Antenna
SC872-A Product User Guide Electrical Interface Built-in Antenna The SC872-A contains built-in RF front-end with integrated GPS antenna, LNA and SAW filter. No external antenna is supported. In order to optimize antenna performance, it is strongly recommended to design a 70 mm x 70 mm ground plane around the module into the application PCB. -
Page 36: Rf Signal Requirements
SC872-A Product User Guide Electrical Interface RF Signal Requirements The receiver can achieve Cold Start acquisition with a signal level above the specified minimum at its input. This means that it can acquire and track visible satellites, download the necessary navigation data (e.g. -
Page 37: Gnss Antenna Polarization
SC872-A Product User Guide Electrical Interface Multipath interference results when the signal from a particular satellite is reflected from a surface (e.g. a building or the roof of a car) and is received by the GNSS antenna either in addition to or in place of the line of sight signal. The reflected signal has a path length that is... -
Page 38: Reference Design
GNSS engine, LNA, and integrated SAW filter. A patch antenna is optimized for good performance. Figure 10-1 SC872-A Reference Design VCC: 0.1 uF or higher by-pass cap connected to Vcc is recommended. TX: Connect a 33 to 100 Ω external resistor in series to minimize overshoot and undershoot RX: Connect a 33 to 100 Ω... -
Page 39: Mechanical Drawings
11 MECHANICAL DRAWINGS Ground Plane In order to optimize antenna performance, a 70mm by 70mm ground plane should be included on the PCB around the module as shown below. Figure 11-1 SC872-A Ground Plane 1VV0301202 Rev. 6 Page 39 of 53 2018-12-21... -
Page 40: Sc872-A Mechanical Drawings
SC872-A Product User Guide Mechanical Drawings SC872-A Mechanical Drawings The SC872-A module has advanced miniature packaging including a passive antenna with a base metal of copper and an Electro less Nickel Immersion Gold (ENIG) finish. Figure 11-3 SC872- Figure 11-2 Mechanical Drawings 1VV0301202 Rev. -
Page 41: Packaging & Handling
Packaging & Handling 12 PACKAGING & HANDLING Product Marking and Serialization The SC872-A modules have a 2D barcode label identifying the and its serial number. Contact a Telit representative for information on specific module serial numbers. The label format is as follows:... -
Page 42: Product Packaging
Moisture Barrier Bag (MBB) with two silica gel packs and placed in a carton. All packaging is ESD protective lined. The SC872-A receivers are Moisture Sensitive Devices (MSD). Please follow the MSD and ESD handling instructions on the labels of the MBB and exterior carton. -
Page 43: Moisture Sensitivity
SC872-A Product User Guide Packaging & Handling Moisture Sensitivity Precautionary measures are required in handling, storing and using these devices to avoid damage from moisture absorption. If localized heating is required to rework or repair the device, precautionary methods are required to avoid exposure to solder reflow temperatures that can result in performance degradation. -
Page 44: Figure 12-3 Moisture Sensitive Devices Label
SC872-A Product User Guide Packaging & Handling Figure 12-3 Moisture Sensitive Devices Label 1VV0301202 Rev. 6 Page 44 of 53 2018-12-21... -
Page 45: Disposal
SC872-A Product User Guide Packaging & Handling Please note that the JEDEC document includes important information in addition to the above figure. Please see: http://www.jedec.org/sites/default/files/docs/jstd020d-01.pdf Disposal We recommend that this product should not be treated as household waste. For more detailed information about recycling this product, please contact your local waste management authority or the reseller from whom you purchased the product. -
Page 46: Environmental Requirements
SC872-A Product User Guide Environmental Requirements 13 ENVIRONMENTAL REQUIREMENTS Operating Environmental Limits Operating Environmental Limits Temperature -20°C to +60°C Temperature Rate of Change ±1°C / minute maximum Up to 95% non-condensing or a wet bulb temperature Humidity of +35°C, whichever is less... -
Page 47: Compliances
(RoHS) • Manufactured in an ISO 9001: 2008 accredited facility • Manufactured to TS 16949:2009 requirements • EU RED Certification Figure 14-1 SC872-A RED Declaration of Conformity 1VV0301202 Rev. 6 Page 47 of 53 2018-12-21... -
Page 48: Safety Recommendations
SC872-A Product User Guide Safety Recommendations 15 SAFETY RECOMMENDATIONS PLEASE READ CAREFULLY Be sure that the use of this product is allowed in the country and in the environment required. The use of this product may be dangerous and must be avoided in the following areas: •... -
Page 49: Glossary And Acronyms
SC872-A Product User Guide Glossary and Acronyms 16 GLOSSARY AND ACRONYMS AGPS: Assisted (or Aided) GPS AGPS provides ephemeris data to the receiver to allow faster cold start times than would be possible using only broadcast data. This extended ephemeris data could be either server-generated or locally-generated. - Page 50 SC872-A Product User Guide Glossary and Acronyms GNSS: Global Navigation Satellite System Generic term for a satellite-based navigation system with global coverage. The current or planned systems are: GPS, GLONASS, BDS, and Galileo. GPS: Global Positioning System The U.S. GNSS, a satellite-based positioning system that provides accurate position, velocity, and time data.
- Page 51 SC872-A Product User Guide Glossary and Acronyms SAW: Surface Acoustic Wave filter Electromechanical device used in radio frequency applications. SAW filters are useful at frequencies up to 3 GHz. SBAS: Satellite Based Augmentation System A system that uses a network of ground stations and geostationary satellites to provide differential corrections to GNSS receivers.
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Page 52: Document History
SC872-A Product User Guide Document History 17 DOCUMENT HISTORY Revision Date Changes 2015-04-29 First issue 2015-06-15 Updated voltage range §9.3 2016-12-07 Corrected format 2016-12-28 Added BDS support 2018-03-12 Changed QZSS default to “disabled” 2018-12-21 Changed to new template Clarified V max. - Page 53 Mod. 0815 2016-08 Rev.1...
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