PDF UC530 Data sheet ( Hoja de datos )

Número de pieza	UC530
Descripción	OEM GPS Antenna Module
Fabricantes	Fastrax
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No Preview Available ! Rev. 1.1 Data Sheet Fastrax UC530 This document describes the electrical connectivity and functionality of the Fastrax UC530 OEM GPS Receiver. May 3, 2012 Fastrax Ltd 1 page Page 5 of 39 5.1 Absolute Maximum Ratings ...................................................................................................................... 20 5.2 DC Electrical specifications........................................................................................................................ 20 5.3 AC Electrical characteristics ...................................................................................................................... 21 6 Manufacturing ................................................................................................................................................... 22 6.1 Assembly and Soldering ............................................................................................................................ 22 6.2 Moisture sensitivity................................................................................................................................... 22 6.3 Marking ..................................................................................................................................................... 22 6.4 Tape and reel ............................................................................................................................................ 23 6.5 Environmental Specification ..................................................................................................................... 23 7 Reference design ............................................................................................................................................... 24 7.1 Reference circuit diagram ......................................................................................................................... 24 7.2 Reference circuit diagram, external antenna connectivity ....................................................................... 25 7.3 PCB layout suggestion ............................................................................................................................... 26 7.3.1 Other electronics on mother board...................................................................................................... 28 7.3.2 Avoiding EMI ......................................................................................................................................... 29 7.4 Embedded antenna operation .................................................................................................................. 29 8 AC530 Application board for UC530 .................................................................................................................. 32 8.1 Board Terminal I/O-connector .................................................................................................................. 32 8.2 Bill of materials ......................................................................................................................................... 33 8.3 AC530 Circuit diagram............................................................................................................................... 35 8.4 AC530 layout and assembly ...................................................................................................................... 36 2012-05-03 UC530_Datasheet 5 Page Page 11 of 39 Note that when using an external VDD power switch in low power modes the host needs to enable GPS operation after initial power up by controlling GPS_ON signal (see reference circuit in chapter 7.1) to high state. The module can control the VDD power switch autonomously via TIMER signal only after the UC530 is set to Periodic, Backup or to AlwaysLocate™ mode by a NMEA command. Note also that first fix position accuracy can be somewhat degraded in Power Management Modes when compared to Full Power operation. User can improve the position accuracy by taking the 2nd or 3rd fix after waking up. User can exit low power Modes 3… 4 to Full Power by sending NMEA command $PMTK,225,02B just after the module has woke up from previous sleep cycle. 3.4 Self-Assistance EASY™ usage The UC530 module self-assistance uses EASY™ (Embedded Assist System) ephemeris extension, which is embedded in the software without any resources required from the host. The EASY™ data is stored on internal flash memory and allows fast TTFF typ. 3 seconds over 3 days and is enabled by default. Allow the receiver to navigate at least for 5 minutes with good GPS satellite visibility in order to collect broadcast ephemeris and to process necessary information. 3.5 Server Assistance EPO™ usage The UC530 module supports also input from server generated EPO™ file (Extended Prediction Orbit, i.e. ephemeris extension), which can be transferred from a FTP server and allows fast TTFF typ. 10 seconds over 7/14 days. Contact Fastrax support for details on EPO FTP server usage. 3.6 Logger LOCUS usage The UC530 module supports embedded logger function called LOCUS and when enabled it can log position information to internal flash memory; default log interval is 15 seconds that provides typically > 16 h log capacity. The LOCUS can be enabled by NMEA command $PMTK185,022. Contact Fastrax support for details on Locus usage. 3.7 DGPS usage By default DGPS navigation mode is disabled. The host may enable DGPS/SBAS navigation mode by sending commands ‘Enable Search of SBAS Satellites’ $PMTK313,12E followed by ‘Set DGPS Data Source to SBAS’ $PMTK301,22E. The search for suitable SBAS satellite signal is automatic. The host may either enable DGPS/RTCM navigation mode by sending command ‘Set DGPS Data Source to RTCM’ $PMTK301,1*2D. The UART Port1 is used for RTCM message input at 9600 baud. Note that DGPS usage is only supported at 1Hz navigation rate in Full Power mode. Note also that acquiring necessary DGPS correction parameters may take up to 1 minute prior DGPS fix status is achieved, which is indicated in the $GPGGA message, Fix Valid Indicator. Note also that DGPS corrections do not provide corrections against multipath errors that are local; thus accuracy is not necessary improved in urban environments. 3.8 Standby Mode Standby Mode means a low quiescent (200 µA typ. at VDD) power state where receiver operation is stopped; both the main supply VDD and the backup supply VDD_B are powered on. The Standby Mode is entered by NMEA command $PMTK161, see chapter 3.3. Waking up from Standby state to Full Power is controlled by host by sending any byte via host communication port. 2012-05-03 UC530_Datasheet 11 Page

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