µ-blox GPS-MS1E
GPS Receiver Module bad on SiRFstar I/LX TM
-Datasheet-
March9,
2000
1Features
S Full Implementation of the SiRFstar I/LX TM Architecture,Including:
-GRF1/LX Low-power RF front-end IC
-GSP1/LX Low-power GPS DSP with
Integrated Real Time Clock(RTC)
-Hitachi RISC CPU SH-7020
-1MBit SRAM
-8MBit FLASH memory
-Low Noi Amplifier
-Filter,Crystals,etc.
S SiRFstar I/LX TM TricklePower TM enhanced power management modes(3stage)
S Differential GPS(RTCM-SC104)input
S PLCC-84pinout compatible package, Dimensions:30.2mm × 29.5mm × 7.55mm
S M/A-Com SSMT coax connector for RF-Input S12General purpo I/Os and4bi-directional
Serial Interfaces
S IRQ inputs plus NMI
S System clock output
S Operating voltage3.3Volts,0.5Watt(max.)
四级计算器S Industrial operating temperature range
(−40-+85°C)
S External requirements:
-
无准考证号查四级成绩入口 3.3Volt power supply,0.5Watt
-Backup battery for real time clock and SRAM
-Serial interface for NMEA or SiRF binary data
-Passive or active Antenna
-Antenna bias voltage for active antenna
S Customer specific code can be implemented
on the Hitachi SH-1processor using theµ-blox Software Customization
Kit.
µ-blox ag
Bertastras1
CH-8003Zürich
Switzerland
www.u-blox.ch
Revision History
Date Section Changes
bypass是什么意思
8.3.00Initial version
Table1:Revision History
All Trademarks mentioned in this document are property of their respective owners.
©µ-blox ag,2000
T HIS DATASHEET CONTAINS INFORMATION ONµ-blox PRODUCTS IN THE SAMPLING AND INITIAL PRODUCTION PHASES OF DEVELOPMENT.T HE SPECIFICATIONS IN THIS DATASHEET ARE SUBJECT TO CHANGE ATµ-BLOX'DISCRETION.µ-blox ASSUMES NO RESPONSIBILITY FOR ANY CLAIMS OR DAMAGES ARISING OUT OF THE USE OF THIS DATASHEET,OR FROM THE USE OF MODULES BASED ON THIS DATASHEET,INCLUDING BUT NOT LIMITED TO CLAIMS OR DAMAGES BASED ON INFRINGEMENT OF PATENTS,COPYRIGHTS OR OTHER INTELLECTUAL PROPERTY RIGHTS.µ-blox MAKES NO WARRANTIES, EITHER EXPRESSED OR IMPLIED WITH RESPECT TO THE INFORMATION AND SPECIFICATIONS CONTAINED IN THIS DATASHEET.P ERFORMANCE CHARACTERISTICS LISTED IN THIS DATASHEET ARE ESTIMATES ONLY AND DO NOT CONSTITUTE A WARRANTY OR GUARANTEE OF PRODUCT PERFORMANCE.
2Overview
GPS-MS1E is a fully lf-contained receiver module for the Global Positioning System(GPS).Bad on the SiRFstar I/LX TM chip t manufactured by SiRF Technology,Inc.,the module supports all features,and maintains the technical specifications of the SiRFstar I/LX TM architecture.
Figure1:Blockdiagram of GPS-MS1E
Fitting the footprint of a PLCC-84package(30.2mm×29.5mm board area),the module provides complete GPS signal processing from antenna input to rial data output(NMEA or SiRF proprietary data format).A cond rial port accepts differential GPS data(RTCM).
Operating at a nominal operating voltage of3.3Volts,the module consumes less than0.5Watts in continuous operation mode.The implementation of the patent pending TricklePower tm Mode allows an additional drastic reduction of power consumption for applications where power consumption is of primary concern(e also theµ-blox Trickle Power Mode application note).Using a third crystal the GPS-MS1E offers extended TricklePower Mode capabilities.It can shut off the RF part and the signal processor of the chipt(GSP1/LX)independently from the processor.The GPS-MS1E is fully backward compatible to the GPS-MS1.adversity
Featuring the GRF1/LX RF front-end chip and an integrated Low-Noi Amplifier(LNA),the module connects amlessly to low-cost passive antennas.Active antennas can be connected to the GPS-MS1E as well,if the antenna bias voltage is supplied externally.General purpo I/Os and sufficient CPU power of the module's Hitachi SH-1RISC CPU allow integration of additional customer specific f
compatibleunctionality.For many applications,the functionality of an external micro-controller can be transferred to GPS-MS1E.The µ-blox Software Customization Kit is required to change the firmware or implement additional functionality on the on-board microprocessor.
3Product Lineup
The GPS-MS1E is supplied in the following default start-up configuration:
-SiRF binary protocol
-19’200Baud
-8data bits,no parity,1stop bit
During a firmware up-date the default start-up configuration of the receiver can be t.Firmware up-dates as well as the up-date utility are available at theµ-blox homepage.See the firmware up-date manual for further information.
Refer to Table2for ordering information.
Option Features
None Standard version
DL Adds datalogging capability
Table2:Ordering Options
For the GPS-MS1E an integrated datalogger is available as an ordering option(GPS-MS1E-DL).This option enables the ur to take advantage of the on-board FLASH memory to store position data.Further information on the capabilities of the datalogger is available on our homepage.
Ordering example:
GPS-MS1E-DL GPS-MS1E with datalogger.
4GPS Performance Specification
4.1GPS accuracy
GPS receiver accuracy is a function of GPS receiver performance,satellite constellation and Selective Availability(S/A).GPS accuracy is not properly defined.Every manufacturer has his own means of defining, measuring and calculating position accuracy.
We define commonly ud measures and give the values for all of them in the GPS Performance app note. In Table2we focus on CEP,which gives the most intuitive feel for the accuracy of a GPS receiver.
Definition of Circular Error Probability:The radius of a circle,centered at the antenna’s true position, containing50%of the fixes.
See GPS receiver performance application note for more details.
4.2Start-up times
简快思维导图A GPS receiver knows different start-up scenarios,which differs significantly in the Time-to-first-fix(TTFF). The start-up scenarios depend on the amount of knowledge the GPS receiver has regarding its positions and the availability of satellites.Just like GPS accuracy,startup times for GPS receivers are another field where every manufacturer has his own naming scheme,and therefore,comparison between receivers is difficult.In the following a short introduction in our definitions of start-up times(e Table3for specifications)is given.Plea note that the numbers were measured with good visibility(open view to the sky).Obstructed view will result in longer start-up times.
林肯的故事Definitions:
Cold Start In Cold Start Scenario,the receiver has no knowledge on last position,approximate time or satellite constellation.The receiver starts to arch for signals blindly.This is standard
behavior,if no backup battery is connected.
Cold Start time is the longest startup time forµ-blox GPS receivers.
Warm Start In Warm Start Scenario,the receiver knows-due to a backup battery–his last position, approximate time and almanach.Thanks to this,it can quickly acquire satellites and get
a position fix faster than in cold start mode.
Hot Start In Hot Start Scenario,the receiver was off for less than2hours.It us its last Ephemeris data to calculate a position fix.
Reacquisition The reacquisition figure gives the time required to get lock on a satellite if the signal has been blocked for a short due to buildings).This is most important in urban
areas.Reacquisition time is not related with TTFF.
Parameter Specification
Receiver Type L1frequency,C/A Code,12-Channel
Max Up-date Rate1Hz
Accuracy(SA)Position
Time 21m CEP +/-180ns
Accuracy(DGPS)Position
Time 2m CEP +/-60ns
lobster
Acquisition(typical)Cold Start
Warm Start
Hot Start 60c 45c 2-6c
Signal Reacquisition100ms
Dynamics<=4g
Operational Limits Altitude<60000ft and velocity<1000knots
Either limit may be exceeded but not both(COCOM
restrictions)
Table3:GPS receiver specifications
5Operating Modes
GPS-MS1E can be operated in different operating modes.
5.1Normal Operation
小学语文阅读In Normal Mode,the module is continuously running as long as the operating voltage Vcc is supplied. Position fixes are generated at the maximum update rate.U of an external backup battery is recommended to reduce the system's startup time.If an external backup battery is connected the module keeps the internal Real Time Clock running and holds the SRAM data(ephemeris and alman汉英字典下载
ac data)during power supply interruption,this enables Warm-and Hotstart.However,under good visibility conditions cold-and warm start times do not differ significantly.
5.2TricklePower Operation
In TricklePower Mode,Vcc is continuously supplied to the module.A software configurable internal timer periodically forces the module to acquire a position fix.Between the fixes,the module remains in an ultra-low power sleep mode.This mode is recommended for applications where lowest power consumption and a periodical position up-date are of primary concern.A backup battery must be connected to enable the module to reduce startup times when recovering from a Vcc supply interruption. The GPS-MS1E supports a new enhanced TricklePower Mode.This enables to shut off the CPU
independently from the RF part and the signal processor.So in TricklePower Mode operation there are3 Modes:Track Mode(RF and CPU on),CPU Mode(CPU on)and Standby Mode(RF off,CPU in stand-by). State Current(typ.)
Track Mode140mA
CPU Mode34mA
Standby Mode0.25mA
Table4:TricklePower Mode states
The RF on time(Track Mode)depends on the length of the up-date period.The CPU on time(CPU Mode) depends also on the number of satellites in view.(See Low Power Mode Application Note for more details). The currents during the different states are given in Table4.This means that the power supply must be capable of delivering at least140mA at3.3V,regardless of the average current drawn by the module in TricklePower Mode.
During the TricklePower mode the firmware periodically schedules ephemeris collection and RTC calibration to insure that uable data is always available.Ephemeris collection occurs once within a30minutes period and whenever a new satellite ris above the horizon.
The power-on scenario in TricklePower Mode differs from the one in continuous Mode.If the module fails to acquire3satellites within a given time(due to bad visibility or very low signal levels)the module goes into an extended sleep pha.The length of this sleep pha is defined by the duty cycle(up-date rate). After this period the module wakes up and tries to acquire a position fix again.
For more detailed information on TricklePower Mode plea check the Low Power Mode Application Note.
5.3Push to Fix Mode
In Push to Fix mode the GPS-MS1E stays in sleep mode until an external request wakes it up and initiates a position fix.The TTFF1stays under6conds.The receiver has the capability to wake itlf up in order to check for new ephemeris data.Through this,low TTFF can be achieved virtually independent on the time the receiver was off.This mode is best ud for application where no periodical position fixes and low power consumption is required.Push to Fix mode operation requires special external wiring,plea refer to the Low Power Mode Application note for more detailed information.
5.4Customized Operation
The Hitachi SH-7020RISC-CPU provides enough computational power to allow the implementation of additional customer specific software into the module.The current datasheet only provides basic information on the availability of I/O signals to the customer's application.In order to implement software on the on-board processor the Software Customization Kit(GPS-SCK)is required.The Softw
are Customization Kit includes a development platform(compiler)and a sub-licen of the firmware on the receiver.Contactµ-blox for a detailed discussion of the feasibility of implementing a particular application.
6T echnical Specifications
6.1Electrical Specifications
6.1.1Absolute Maximum Ratings
Parameter Symbol Min Max Units
Power Supply Voltage Vcc-0.3 3.6V
Input Pin Voltage Vin-0.3Vcc+0.3V
Antenna Bias Current Iant300mA
Storage Temperature Tstg-55125°C
Table5:Absolute Maximum Ratings
1Time to first fix
