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SC872-A

Product User Guide

Product Features

1VV0301202 Rev. 6

Page 22 of 53

2018-12-21

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. gap = 0 to 3 600 000 ms, default = 180 000

$PMTK225

,<Type>,<Run_time>,<Sleep_time>,<2

_run_time>,<2

_sleep_time>*<checkum>

Where:

Type = 1 for Periodic (backup) mode or 2 for Periodic (standby) mode

Run_time = Full Power period (ms)

Sleep_time = Standby period (ms)

_run_time = Full Power period (ms) for extended acquisition if GNSS acquisition fails

during Run_time

_sleep_time = Standby period (ms) for extended sleep if GNSS acquisition fails during

Run_time

Example:

$PMTK225,1,3000,12000,18000,72000*16

for periodic mode with 3 s navigation and 12 s sleep in backup state.

The acknowledgement response for the command is:

$PMTK001,225,3*35

To exit Periodic Sleep mode, send the NMEA command

$PMTK225,0*2B

just after the module wakes up from a previous sleep cycle.

AlwaysLocate™ Modes

AlwaysLocate™ is an intelligent controller of the Periodic mode where the main supply pin

VCC_IN is still powered, but power distribution is controlled internally. Depending on the

environment and motion conditions, the module can autonomously and adaptively adjust the

parameters of the Periodic mode, e.g. RF on/off ratio and fix rate, to achieve a balance in

positioning accuracy and power consumption. The average current drain will vary based on

conditions.

To enter an AlwaysLocate mode, send the following NMEA command:

$PMTK225,<mode>*<checksum><CR><LF>

Where mode = 8 for AlwaysLocate (standby) mode or 9 for AlwaysLocate (backup) mode

Example:

$PMTK225,9*22

The acknowledgement response for the command is:

$PMTK001,225,3*35

To exit AlwaysLocate mode, send the NMEA command:

$PMTK225,0*2B

just after the module wakes up from its previous sleep cycle.

Содержание SC872-A

Страница 1: ...SC872 A Product User Guide 1VV0301202 Rev 6 2019 12 05...

Страница 2: ...for copyrighted material including the exclusive right to copy reproduce in any form distribute and make derivative works of the copyrighted material Accordingly any copyrighted material of Telit and...

Страница 3: ...ivities IV Trademarks TELIT and the Stylized T Logo are registered in the Trademark Office All other product or service names are the property of their respective owners V Third Party Rights The softw...

Страница 4: ...SC872 A Product User Guide Product Applicability Table 1VV0301202 Rev 6 Page 4 of 53 2018 12 21 PRODUCT SC872 A Table 0 1 Product Applicability Table PRODUCT APPLICABILITY TABLE...

Страница 5: ...Requiring a Non Disclosure Agreement 10 2 PRODUCT DESCRIPTION 11 Product Overview 11 Block Diagram 12 SC872 A Block Diagram 12 Product Pictures 13 3 EVALUATION KIT 14 4 PRODUCT FEATURES 16 Multi Cons...

Страница 6: ...ty 25 Jamming Mitigation Performance example 26 7 MESSAGE INTERFACE 27 NMEA Output Messages 27 Standard Messages 27 Proprietary Output Messages 28 NMEA Input Commands 29 NMEA Commands List 29 8 FLASH...

Страница 7: ...49 17 DOCUMENT HISTORY 52 TABLES Table 0 1 Product Applicability Table 4 Table 4 1 Power Management Command summary 19 Table 5 1 Data Retention 23 Table 6 1 Horizontal Position Accuracy 24 Table 6 2...

Страница 8: ...ow Power GLP mode diagram 20 Figure 4 3 Periodic Modes diagram 21 Figure 4 4 Periodic Mode example 1 21 Figure 4 5 Periodic Mode example 2 21 Figure 6 1 Jamming with AIC Disabled 26 Figure 6 2 Jamming...

Страница 9: ...ere you can buy the Telit modules or for recommendations on accessories and components visit http www telit com Our aim is to make this guide as helpful as possible Keep us informed of your comments a...

Страница 10: ...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 install...

Страница 11: ...y Based on the MT3333 engine with ARM7 core 99 search channels and 33 tracking channels Constellations GPS L1 QZSS and either Glonass L1 or BeiDou B1 or Galileo SBAS corrections capable WAAS EGNOS MSA...

Страница 12: ...SC872 A Product User Guide Product Description 1VV0301202 Rev 6 Page 12 of 53 2018 12 21 Block Diagram SC872 A Block Diagram Figure 2 1 SC872 ABlock Diagram...

Страница 13: ...SC872 A Product User Guide Product Description 1VV0301202 Rev 6 Page 13 of 53 2018 12 21 Product Pictures Top antenna Bottom Figure 2 2 SC872 A Pictures...

Страница 14: ...2018 12 21 3 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 t...

Страница 15: ...SC872 A Product User Guide Evaluation Kit 1VV0301202 Rev 6 Page 15 of 53 2018 12 21 Figure 3 2 SC872 A Evaluation Unit...

Страница 16: ...S in the same L1 band Enabling the SBAS feature limits the maximum fix rate to 5 Hz Otherwise the maximum is 10 Hz The module is enabled for SBAS by default but can be disabled by command PTMK313 SBAS...

Страница 17: ...Mask Angle The default elevation mask angle is 5 It can be changed via the PMTK311 command Static Navigation Static Navigation is an operating mode in which the receiver will freeze the position fix...

Страница 18: ...turated after which the GNSS signal levels start to diminish Jamming rejection is enabled by default but can be disabled with the PMTK286 command Figure 4 1Jamming Rejection Internal LNA The modules i...

Страница 19: ...be enabled by sending the desired command using the host serial port RX Table 4 1 Power Management Command summary Full Power Continuous Mode The module starts in full power continuous mode when powe...

Страница 20: ...d PMTK161 0 28 STOP Mode PMTK161 1 29 SLEEP Mode To exit a Standby mode send any byte to the host port RX GLP Mode In the GNSS Low Power GLP mode power consumption is reduced for some time during a on...

Страница 21: ...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 STANDBY SLEEP ARM baseband and RF are...

Страница 22: ...backup state The acknowledgement response for the command is PMTK001 225 3 35 To exit Periodic Sleep mode send the NMEA command PMTK225 0 2B just after the module wakes up from a previous sleep cycle...

Страница 23: ...ble shows which data elements are saved under each type of initialization To erase EPO data use the PMTK127 command Data Retention 1 Initialization Almanac Ephemeris EPO Host EPO EASY Position Time Po...

Страница 24: ...Conditions 24 hr Static 130 dBm Full Power mode Table 6 1 Horizontal Position Accuracy Time to First Fix Constellation s Start Type Max TTFF s GPS Hot 1 Warm 32 Cold 33 Glonass Hot 1 4 Warm 28 Cold 29...

Страница 25: ...Acquisition 145 Navigation 156 Tracking 157 GLONASS Acquisition 143 Navigation 153 Tracking 157 GPS GLO Acquisition 143 Navigation 153 Tracking 156 Test Conditions Internal LNA used GNSS radiating ant...

Страница 26: ...SC872 A Product User Guide Product Performance 1VV0301202 Rev 6 Page 26 of 53 2018 12 21 Jamming Mitigation Performance example Figure 6 1 Jamming with AIC Disabled Figure 6 2 Jamming with AIC Enabled...

Страница 27: ...hich contains additional proprietary information NMEA Output Messages Some sentences may exceed the NMEA length limitation of 80 characters Default GPS and GLONASS constellations enabled Default fix r...

Страница 28: ...nstellation BD BeiDou GA Galileo GL GLONASS GP GPS QZ QZSS Table 7 3 NMEA Talker IDs Proprietary Output Messages The modules support several proprietary NMEA output messages which report additional re...

Страница 29: ...xecuted NMEA Commands List See Table 4 1 Power Management Command summary for power management commands Command Description PMTK000 Test This command will be echoed back to the sender for testing the...

Страница 30: ...to update the FW the following steps should be performed to re program the module 1 Remove all power to the module 2 Connect serial port USB cable to a PC 3 Apply main power 4 Clearing the entire flas...

Страница 31: ...ge 31 of 53 2018 12 21 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 Hous...

Страница 32: ...nabling low power operation modes The supply must be able to handle the current fluctuation including any inrush surge current Vcc also charges the internal battery Battery If the DC supply is removed...

Страница 33: ...er Consumption State Constellation Typ Units Acquisition GPS Only 99 mW Glonass Only 83 mW GPS and Glonass 99 mW Navigation Tracking GPS Only 80 mW Glonass Only 86 mW GPS and Glonass 86 mW Low Power A...

Страница 34: ...is full duplex and supports configurable baud rates Frame is 8 bits no parity bit and 1 stop bit The idle state of UART TX is logic high The default rate of 9600 bps can be changed via a PMTK251 comma...

Страница 35: ...commended to design a 70 mm x 70 mm ground plane around the module into the application PCB See 11 1 Ground Plane for details If the ground plane size is smaller than 70x70mm a center frequency detuni...

Страница 36: ...Hz for a GPS signal level of 130 dBm at the RF input This assumes a SEN system equivalent noise of the receiver of 4 dB System Equivalent Noise includes the Noise Figure of the receiver plus signal p...

Страница 37: ...the line of sight signal such as in an urban canyon environment then the number of satellites in view could drop below the minimum needed to determine a 3D position This is a case where a bad signal m...

Страница 38: ...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 external resistor in series to minimize overshoot and und...

Страница 39: ...s 1VV0301202 Rev 6 Page 39 of 53 2018 12 21 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...

Страница 40: ...age 40 of 53 2018 12 21 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 Gol...

Страница 41: ...identifying the and its serial number Contact a Telit representative for information on specific module serial numbers The label format is as follows Label Description 1 Telit Logo 2 Module Identifica...

Страница 42: ...Each tray is dry packaged and vacuum sealed in a 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 Sen...

Страница 43: ...bag with desiccant and humidity indicator cards The module must be placed and reflowed within 168 hours of first opening the hermetic seal provided the factory ambient conditions are 30 C and 60 R H...

Страница 44: ...SC872 A Product User Guide Packaging Handling 1VV0301202 Rev 6 Page 44 of 53 2018 12 21 Figure 12 3 Moisture Sensitive Devices Label...

Страница 45: ...nd 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...

Страница 46: ...maximum Humidity Up to 95 non condensing or a wet bulb temperature of 35 C whichever is less Maximum Vehicle Dynamics 2G acceleration Table 13 1 Operating Environmental Limits Storage Environmental Li...

Страница 47: ...th the following Directive 2011 65 EU art 16 on the restriction of the use of certain hazardous substances in electrical and electronic equipment RoHS Manufactured in an ISO 9001 2008 accredited facil...

Страница 48: ...th components external to the module as well as for any project or installation issue Should there be any doubt please refer to the technical documentation and the regulations in force The integrator...

Страница 49: ...ensitivity The lowest signal level at which a GNSS receiver is able to reliably acquire satellite signals and calculate a navigation solution from a Cold Start Cold start acquisition sensitivity is li...

Страница 50: ...MSD Moisture sensitive device MTSAT Multifunctional Transport Satellites The Japanese system of geosynchronous satellites used for weather and aviation control Navigation Sensitivity The lowest signa...

Страница 51: ...rystal Oscillator Tracking Sensitivity The lowest signal level at which a GNSS receiver is able to maintain tracking of a satellite signal after acquisition is complete TTFF Time to First Fix The elap...

Страница 52: ...5 Updated voltage range 9 3 2 2016 12 07 Corrected format 3 2016 12 28 Added BDS support 4 2018 03 12 Changed QZSS default to disabled 5 2018 12 21 Changed to new template Clarified VIH max Deleted Ma...

Страница 53: ...Mod 0815 2016 08 Rev 1...

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