JP14-R/Q hardware manual
Contents
1. 6 3 Configuration and timing signals M RST This pin provides an active low reset input to the board It causes the board to reset and to start searching for satellites If not utilized this input pin may be left open T MARK This pin provides 1 pulse per second output from the board which is synchronized to within 1 microsecond of GPS time The output is a CMOS level signal BOOTSEL Set this Pin to high 33 V DC for reprogramming the flash of the JP14 R Q for instance updating a new firmware for the JP14 R Q sall 6 4 Serial communication signals The board supports two full duplex serial channels All serial connections are at CMOS level If you need different voltage levels use appropriate level shifter e g MAX 3232 from Maxim in order to obtain RS232 compatible signal levels see also chapter 9 All supported baud rates can be controlled from the appropriate screens in SiRFdemo software You can directly communicate with it through a PC serial port SDI This is the main receiving channel and is used to receive software commands to the board from SIRFdemo software or from user written software SDI2 This is the auxiliary receiving channel and is used to input differential corrections to the board to enable DGPS navigation Note that the current operating firmware does not support DGPS SDO1 This is the main transmitting channel and is used to output navigation and measurement data to SiRFdemo or user written softwa2. See chapter 5 3 1 8 page 14 Corrected 1PPP Pulse duration from 100 ms to 1 5 us See chapter 5 3 1 10 page 14 GPS operating firmware currently does not support DGPS Added chapter Appendix how to set the target device into power saving modes See chapter 5 3 1 10 page 14 The description of the pin 18 on JP14 R receiver changed from analogue ground to digital 1 0 4 F Beqiri ground 02 03 2007 Updated soldering profile see Figure 11 page 30 and read the note below 1 0 5 F Beqiri JP14 modules can accept only one reflow process 25 09 2007 This confidential document is the property of FALCOM and may not be copied or circulated without permission FALCOM Page 4 MALLES COMMPICATIONE GMIM JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 Cautions Information furnished herein by FALCOM is believed to be accurate and reliable However no responsibility is assumed for its use Also the information contained herein is subject to change without notice Please read carefully the safety precautions If you have any technical questions regarding this document or the product described in it please contact your vendor General information about FALCOM and its range of products is available at the following Internet address http www falcom de Trademarks Some mentioned products are registered trademarks of their respective companies Copyright The JP14 R Q hardware de
3. 0x 0B 11 Command Acknowledgement Successful request 0x0C 12 Command No Acknowledgement Unsuccessful request 0x0D 13 Visible List Auto Output 0x0E 14 Almanac Data Response to Poll 0 x OF 15 Ephemeris Data Response to Poll 0x10 16 Test Mode 1 For use with SiRFtest Test Mode 1 0x12 18 Ok To Send CPU ON OFF Trickle Power 0x13 19 Navigation Parameters Response to Poll 0x14 20 Test Mode 2 Additional test data Test Mode 2 0x1C 28 Nav Lib Measurement Data Measurement Data Ox1E 30 Nav Lib SV State Data Satellite State Data Ox 1F 31 Nav Lib Initialization Data Initialization Data OxFF 255 Development Data Various status messages Table 6 SiRF Output Messages Table 7 lists the message list for the SIRF input messages Hex ASCII Name Description 0x55 85 Transmit Serial Message User definable message 0 x 80 128 Initialize Data Source Receiver initialization and associated parameters 0x 81 129 Switch to NMEA Protocol Enable NMEA message output rate and baud rate 0 x 82 130 Set Almanac upload Sends an existing almanac file to the receiver 0 x 84 132 Software Version Poll Polls for the loaded software version 0 x 86 134 Set Main Serial Port Baud rate data bits stop bits and parity 0 x 87 135 Switch Protocol Obsolete 0 x 88 136 Mode Control Navigation mode configuration 0x89 137 DOP Mask Control DOP mask selection and parameters 0x 8B 139 Elevati
4. 4 4 on page 17 When ATP is enabled the receiver will maximize the navigation performance Depending on different states of the power management circuits the receiver belongs to one of three system states Full Power State Acquisition Tracking modes After initial turn on or system reset the JP14 will remain in the full power state until a series of Kalman filter navigation solution is obtained all ephemeris data is collected and the RTC is calibrated before transitioning to CPU state The receiver stays in full power state until a position solution is made and estimated to be reliable In this state all RF circuitry and the baseband are fully powered Even in this state there is a difference in power consumption during acquisition mode and tracking mode During the acquisition mode processing is more intense thus consuming more power Diagram is shown below that is simplified for ease of understanding Timing values are only examples CPU State In this state the LNA in the RF section is shut off The TCXO and fractional synthesizer from the RF section are still powered in order to provide a clock to the This confidential document is the property of FALCOM and may not be copied or circulated without permission FALCOM Page 15 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 CPU This state is entered when the satellite measurements have been collected but the navigation solution still needs to be computed thus consuming po
5. HISTORY Version Author Changes Release date 1 0 0 F Beqiri Initial version 26 07 2005 The JP14 Q is a 40 pin BGS package instead of 36 pin BGA package on the early version Due to this reason the following figures and tables are updated figures 2 3 and 4 attached Table 2 balls 37 38 39 and 40 added 1 0 1 F Bedii _ Table 1 updated JP14 R balls 13 14 15 and 17 changed from GND to NC not 12 10 2005 connected The diagram of the reflow soldering conditions added 1 0 2 F Beqiri Corrected round ball diameter from 0 6 mm to 1 mm see figures 6 and 7 09 01 2006 Corrected sensitivity of the JP14 GPS receivers see chapter 5 3 1 6 page 14 Chapter 5 4 on page 15 added The description of Adaptive TricklePower ATP and Push to Fix PTF mode is now available The new JP14 Q REV05B PCB and JP14 R REV04B PCB revisions are now available The following features have been added test points the figures throughout this document have been repleaced the Vbat signal incorporates voltage detection reset circuitry has been optimized It monitors now the VCC signal instead of the VCCGSP signal and allows the implementation of the Push to Fix mode hibernate 1 0 3 F Beqiri state 27 06 2006 Corrected size of the JP14 Q height See chapter 4 1 page 11 Updated figures 4 5 and 6 see chapter 8 page 26 Updated average power consumption to 62 mA 3 3 continuous mode
6. and may entail modifications effecting the accuracy and performance of the GPS equipment 2 2 Restricted use Certain restrictions on the use of the GPS receiver may have to be observed on board a plane in hospitals public places or government institutions laboratories etc Follow these instructions 2 3 Children Do not allow children to play with the GPS receiver It is not a toy and children could hurt themselves or others The GPS receiver consists of many small parts which can come loose and could be swallowed by small children Thoughtless handling can damage the GPS receiver 2 4 Operation antenna Operate the GPS receiver with an antenna connected to it and with no obstruction between the receiver and the satellite Make absolutely sure that the antenna socket or antenna cable is not shorted as this would render the GPS receiver disfunctional Do not use the receiver with a damaged antenna Replace a damaged antenna without delay Use only a manufacturer approved antenna Use only the supplied or an approved antenna with your GPS receiver Antennas from other manufacturers which are not authorized by the supplier can damage the GPS receiver Technical modifications and additions may contravene local radio frequency emission regulations or invalidate the type approval Authorized GPS antennas FAL ANT 3 active antenna 2 5 Electrostatic Discharge ESD The JP14 R Q GPS receivers contain class 1 devices The following El
7. to be connected to active GPS antennas with a max current 25 mA VCCRF This pin is an output which provides 2 85 V DC and can be connected to the V_ANT to supply the connected GPS antenna 2 85V active antenna Note The maximum output current on this pin should be limited upto 25 mA to protect the GPS receiver from damage This confidential document is the property of FALCOM and may not be copied or circulated without permission FALCOM Page 22 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 7 SOFTWARE INTERFACE The FALCOM JP14 R Q support NMEA 0183 and SiRF binary protocols A short description of these protocols is provided herein For more detailed information about the messages listed in tables below please refer to the SiRFstarlll message set specification available in the section Support Downloads Documentation SiIRF SiRFmessages_SSIII zip at FALCOM homepage 7 1 SIRF binary data message Table 6 lists the messages for the SIRF output Hex ASCII Name Description 0x02 2 Measured Navigation Data Position velocity and time 0x03 3 True Tracker Data Not implemented O x 04 4 Measured Tracking Data Satellite and C No information 0 x 06 6 SW Version Receiver software 0x07 7 Clock Status Current clock status 0 x 08 8 50 BPS Subframe Data Standard ICD format 0 x 09 9 Throughput Navigation complete data 0x0A 10 Error ID Error coding for message failure
8. to fix position and refresh ephemeris on the default period of 30 minutes the receiver will sleep for the 29 minutes and 45 seconds Whenever the receiver wakes up it collects almanac and ephemeris data and then goes back to the previous sleep phase again Diagram for PTF mode Hibernate state Hibernate state This period is variable and can take up to 45 qe ie a By default 30 minutes dilis yb as enS y t 30 minutes To Be Defined Remark The environment temperature may also affect the power consumption in the Hibernate state Figure 5 Three system states in the PTF mode 5 4 4 NMEA input message for ATP amp PTF Mode Power saving mode is disabled by default In order to enable it inout the NMEA message in table below The description of each parameter used for Adaptive TricklePower or Push to Fix is listed below How to send these messages to the target unit refer to chapter Appendix section 11 1 page 33 Syntax PSRF107 lt Mode gt lt OnTimeMs gt lt LPinterval gt lt MaxAcqTimeMs gt lt MaxOfffimeMs gt lt TPAdaptive gt lt CS gt lt CR gt lt LF gt PSRF107 1 400 2000 60000 60000 1 17 lt CR gt lt LF gt Examples PSRF107 2 400 60000 60000 60000 0 21 lt CR gt lt LF gt PSRF107 0 0 0 0 0 0 21 lt CR gt lt LF gt Parameter Description lt Mode gt It defines the mode to be performed It can be set to 0 Sets the target receiver back to the Continu
9. wakeup But in harsh tracking environments the receiver automatically switches to full power state to improve navigation performance When the satellites are sorted according their signal strength the fourth satellite determines if the transition will occur or not The threshold is 26 dB Hz When tracking conditions return to normal four or more satellites with C No of 30 dB Hz or higher the receiver switches back to the power saving mode 5 4 3 Push to Fix Mode The Push to Fix mode puts the FALCOM JP14 family into a background duty cycle which provides a periodic refresh of position receiver time ephemeris data and RTC calibration every 10 seconds to 2 hours The transition of receiver into the Push to Fix mode can be implemented and configured by using either the Action Set Low Power Trickle Power command available in SIRFDemo evaluation software or the input command described in chapter 5 4 4 on page 17 This confidential document is the property of FALCOM and may not be copied or circulated without permission FALCOM Page 16 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 The PTF period is 30 minutes by default but can be anywhere between 10 seconds and 2 hours When the PTF mode is enabled due to a new PTF cycle the receiver will stay on full power until the good navigation solution is computed The so called hibernate state will follow for the remainder of the period For example if the receiver took 15 seconds
10. OS This confidential document is the property of FALCOM and may not be copied or circulated without permission G FALCOM Page 19 ALLES COMMAPICATONI misi JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 omme wo I PWRCTL O Control outputs Do not use leave it open CMOS WAKEUP O Control outputs Do not use leave it open CMOS 38 MRST i Restthe unit acivelw _ emos 39 VDD_RTC 1 Contobine for production test Do not use eave topen 15VDC 140 ON OFF Controkine for production test Do notuse leave itopen CMOS Table 1 Pin assignment of the JP14 R 6 2 Interfaces balls assignment of the JP14 Q 39 18 17 16 15 14 13 12 Ni gitedse 40 30 31 32 33 34 35 36 37 Bal Name vo Description Tie GND RE Analogue grounds 2 VANT Power supply for an active antenna e poe a Dera ce 3 Analogue grounds 4 Main power supply 3 3VDC 5 5 VBAT Power for RTC and SRAM 3 V DC 5 VCCRF Rey Supply voltage of RF section 2 85 V DC max 25 mA 8 M RST i Rest the unit active low CMOS ae VCCGSP3 a e output for baseband processor Do not use leave cMos 10 PWRCTL O Control outputs Do not use leaveitopen CMOS 11 BOOTSEL _ Boots the unit into the Update mode if it is set to HIGH CMOS VCC 12 WAKEUP_ O Control outputs Do not use leave it open CMOS 13 cs2___ O Control outputs Do not use le
11. P mode Excluding sign and checksum After the message is correctly typed send the defined message to the target unit by clicking the SEND button The target device responds with Acknowledged if the target unit accepts the sent message Send Data Specify in Hex e g 55 AB 6D However use text format for NMEA and None ASCII PSRF107 1 400 2000 60000 60000 1 Send Cancel Protocol Wrapper SiRF Binary NMEA lt data gt ck rn p None HEX None ASCII Send To Aux Data Source Figure 14 Transmit a NMEA message to the target unit To set the target receiver back to the full power mode just transmit the following message PSRF107 0 0 0 0 0 0 sets the target receiver back to full power mode For more information how to send the SiRF Binary or NMEA messages to the target unit please refer to the SiRFstarlll message set specification available in the section Support Downloads Documentation SiRF SiRFmessages_SSIII zip at FALCOM homepage This confidential document is the property of FALCOM and may not be copied or circulated without permission G FALCOM Page 33
12. S and SBAS WAAS EGNOS tracking and acquisitions After initialization the receiver handles all the time critical and low latency acquisition tracking and reacquisition tasks of GPS and SBAS autonomously The on chip SRAM size is 1 Mbit 32Kx32 memory that can be used for either instructions or data The SRAM is designed for a combination of low power and high speed and can support single cycle reads for all bus speeds In many applications the 4 Mbit FLASH completely eliminates the need for external data memory RECEIVER ARCHITECTURE GPS antenna input _ SD ER lt GPS Core TTT spor spor Serial SDQ2 SDI2 E a Main Input Power 3 3 V DC BOOTSEL Figure 3 Architecture of the JP14 R Q GPS receivers Figure 3 above shows the block diagram of the JP14 R Q architecture This confidential document is the property of FALCOM and may not be copied or circulated without permission G FALCOM Page 12 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 5 2 Product applications Handheld GPS receiver applications Automotive applications Marine navigation applications Aviation applications Timing applications 5 3 Technical specifications 5 3 1 Electrical Characteristics 5 3 1 1 General Frequency C A code Channels Max update rate Processor speed Data bus 5 3 1 2 Accuracy Position Velocity Time 5 3 1 3 DGPS Accuracy P
13. THIS DOCUMENT IS AVAILABLE AT HTTP WWW FALCOM DE 6 FALCOM WIRELESS COMMUNICATIONS GMBH JP14 R JP14 Q GPS Receivers Lead free products Hardware description VERSION 1 0 5 UPDATED 25 09 2007 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 TABLE OF CONTENTS INTRODUCTION a GIOIE 6 bee e a a Me a E 6 1F24Usediabbreviatio sf ee eee TOO 7 FIRE AteAICOCUMENISE EE RR TTT 8 2SEGURIN ri gi ole Qe 9 21 Generainiomato ref e te ee pTff toto 9 22IRESICUSCEEe e RR 9 ZAR 9 24 Operatiomantenna ce e nno 9 2 gt Electrostatic DIANE EES BY en 9 SSAFETN STANDARDS GG GG 10 4 TECHNICALDATA Si 11 4A EEMIURESPTTEeTOEoREeCelIilile E nt 11 5 TECHNICAL DESCRIPTION sire resect eee 12 5aliReceiverArchite tue Eee reece e rae arene ero net arn aa Parner o o io 12 5 2 Rroduct applications eee a e a 13 SU NeCNNIGAIS PECITCAUONSEE RE o 13 58 4lRElecticaliGharacte rist EEE n 13 5ialMkGenerale n 5 3 1 2 Accuracy aaa renee 5 3 1 3 DGPS Accuracy SIAMA ie TTT ER e E O bree roa ere secret eee E NEO STEN UO 53 15 Time totFirst Posion e n RO RE E N N Sn est 13 SMESSO i 14 5317 Dynamic Condittons e a a tito 14 53 18DCPOWEN T Ei 14 529419 Seral Potete e RL RR nOn n nni 14 5341 OSMIMe NRPS PUSE aa Tee e I O IO ottici 14 5 4 Power management modes OVErview ii 15 STASIENOMmmal peratioNiMole eee el eee eee er eet rece eee A 15 5 4 2 Adapt
14. ages The digital section of both GPS receivers includes a powerful SiRFstarlll core GPS signal processor that handles all the time critical and low latency acquisition tracking and reacquisition tasks autonomously and a 50 MHz ARM7TDMI processor The JP14 R Q with the equivalent of more than 200 000 correlators used for processing signals enable extremely fast and deep GPS signal search capabilities achieving time to first fix in only seconds resulting a significant improvement on the GPS performance They come with an integrated 4 megabit flash memory and 1 megabit SRAM memory eliminating the need for an external flash component and significantly simplifying the routing associated with integrating a GPS receiver into a board design Supporting multiple reference frequencies the RF section of the JP14 R Q is the most highly integrated lowest power SiRF RF implementation to date combining RTC and monitor circuitry and is designed to bring many components that were previously on the board into the silicon while reducing RF current consumption to just 13 mA Each of units delivers major advancements in GPS performance accuracy integration computing power and flexibility The unit has an integrated temperature compensated crystal oscillator TCXO Due to the higher stability of frequency it offers a high improved GPS performance In addition higher sensitivity allows it more flexibility on its design the placement of the antenna and the selecti
15. asurement and satellite tracking The amount of time spent in the initial full power is dependent on the start conditions such as the number of satellites for which the ephemeris data must be collected and the time to calibrate the RTC When the JP3 family has been locked on to at least four satellites the receiver is able to calculate its current positions In this mode the JP14 family is fully powered and satellite searching initial acquisition initial position calculation and tracking measurement functions are always performed In order to reduce the start up time of the receiver it is preferable to connect externally a backup battery so that the RTC is running during the power interrupt The backup power is required for retention of SRAM memory and maintaining the Real Time Clock The validity of data stored in SRAM is kept due to RTC keeps running and these data will be needed on the next power up scenario 5 4 2 Adaptive TricklePower mode ATP Adaptive TricklePower ATP is a variant of TricklePower TM But only ATP and Push To Fix PTF is described in next chapter modes are supported on JP14 family ATP is best suited for applications where regular updates are required and where stronger signal levels are expected The transition of receiver into the ATP mode can be done and configured by using either the Action Set Low Power Trickle Power command available in SiRFDemo evaluation software or the input command described in chapter 5
16. ave it open CMOS SDA Serial Data Serial Data inputA OOO Serial Data inputA OOO CMOS Serial Data Output B It is not supported by default CMOS wo Sen SDO1 O Serial Data Output A CMOS VDDK o Core power at 1 5 V Do not use leave it open E 20 SDI2 Serial Data Input B It is not supported by default CMOS GSW3 1 0 22 VDDRTC___ I Control line for production test Do not use leave itopen 1 5VDC 23 TMARK O 1PPSTimeMark Output CMOS 24 ON OFF _ _Control line for production test Do not use leave itopen CMOS 25 NADC_cS___ O Control outputs Do not use leave it open CMOS This confidential document is the property of FALCOM and may not be copied or circulated without permission FALCOM Page 20 ALLES COMMAPICATONI misi JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 oor sone TO Te TIMERSYNC o Control outputs Do not use leave it open CMOS SPI_EN m Control line for production test Do not use leave it open CMOS SPI_CLK a ee ce for production test Do not use leave it TS NADC_D _ Donotuse leave it open SPI_DATA Oo Control line for production test Do not use leave it open Po NSRESET I Do not use leave it open s2 GND Digital grounds ov faa fenp dT Cd I NWS I a 135 onDRF Analogue grounds 36 RFIN 1_ GPS signal from connected antenna _ S00hms 1575 GHz an P Table 2 Pin assignment of the JP14 Q
17. eckSum 0 while index lt msgLen checkSum checkSum message index checkSum checkSum AND 2 1 Note All fields in all proprietary NMEA messages are required none are optional All NMEA messages are comma delimited This confidential document is the property of FALCOM and may not be copied or circulated without permission G FALCOM Page 25 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 8 MECHANICAL DRAW The following chapters describe the mechanical dimensions of JP14 R Q and give recommendations for integrating of the JP14 R Q or into your application platform Note that the absolute maximum dimension of the JP14 R Q module is 10 2 mm x 24 5 mm B xL The absolute maximum dimension of the modules are JP14 R 10 2 mm x 24 5 mm B x L and JP14 Q 15 7 mm x 17 2 mm B x L Figures 6 and 7 show the top view of the JP14 R Q GPS receivers and provide an overview of the mechanical dimensions of the board respectively Please note that the JP14 R Q have a dimension tolerance 0 1 mm Figure 6 The mechanical draw of the JP14 R 0 20 mm_ 000 I Tg DE le 15 7 mm Figure 7 The mechanical draw of the JP14 Q This confidential document is the property of FALCOM and may not be copied or circulated without permission 3 FALCOM Page 26 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 Recommendations for layout and soldering Figure 8 shows
18. ectrostatic Discharge ESD precautions are recommended Protective outer garments Handle device in ESD safeguarded work area Transport device in ESD shielded containers Monitor and test all ESD protection equipment Treat the JP14 R Q GPS receivers as extremely sensitive to ESD This confidential document is the property of FALCOM and may not be copied or circulated without permission FALCOM Page 9 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 3 SAFETY STANDARDS The GPS receiver meets the safety standards for RF receivers and the standards and recommendations for the protection of public exposure to RF electromagnetic energy established by government bodies and professional organizations such as directives of the European Community Directorate General V in matters of radio frequency electromagnetic energy This confidential document is the property of FALCOM and may not be copied or circulated without permission FALCOM Page 10 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 4 TECHNICAL DATA 4 1 FEATURES OEM single board 20 channel GPS receiver Size Weight Casing TCXO FLASH Memory Operating voltage Power consumption Power management Temperature range storage Protocol JP14 R 10 2 x 24 5 x 3mm B x Lx H JP14 Q 15 7 x 17 3 x 3mm Bx Lx H JP14 R 1 5 g without shielding JP14 Q 1 2 g without shielding Fully shielded 0 5 pom on chip 4 Mb
19. es supported by SiRFstarlll evaluation receiver and a brief description Option Description GGA Time position and fix type data GLL Latitude longitude UTC time of position fix and status GSA GPS receiver operating mode satellites used in the position solution and DOP values GSV The number of GPS satellites in view satellite ID numbers elevation azimuth and SNR values MSS This message can be switched on via SiRFdemo software Signal to noise ratio signal strength frequency and bit rate from a radio beacon receiver RMC Time date position course and speed data VTG Course and speed information relative to the ground Table 8 NMEA Output Messages 7 2 2 NMEA input messages Message MID Description Set Serial Port 100 Set PORT A parameters and protocol Navigation Initialization 101 Parameters required for start using X Y Z Query Rate Control 103 Query standard NMEA message and or set output rate LLA Navigation Initialization 104 Parameters required for start using Lat Lon Alt Development Data On Off 105 Development Data messages On Off MSK Receiver Interface MSK Command message to a MSK radio beacon receiver Table 9 MEA Input Messages Note 1 Message Identification MID 2 Input co ordinates must be WGS84 3 Input co ordinates must be WGS84 NMEA input messages 100 to 105 are SiRF proprietary N MEA messages The MSK NMEA string is as defined by t
20. he JP14 on the PCB secure that the connection to the antenna signals is routed In order to make it properly functional a control impedance line has to connect the RF_IN signal with antenna feed points or antenna connector respectively The routing on the PCB depends on your choice The input power is also very important as far as the minimum and maximum voltage is concerned The power supply of JP14 family has to be a single voltage source of VCC at 3 3 VDC 5 Please connect GND pins to ground and connect the lines which supply the VCC pin to 3 3 V properly If they are correctly connected the board is full powered and the unit begins obtaining its position fix Serial Interface The JP14 family provides two serial interfaces Each interface is provided with two wires the SDI and SDO1 lines for the first serial interface port A and SDI2 and SDO2 lines for the second serial interface port B The current firmware does not support DGPS correction data These pins are 3 3 V CMOS compatible In order to use different voltage levels an appropriate level shifter has to be used E g in order to provide RS232 compatible levels use the 3 V compatible MAX3232 transceiver from Maxim or others based on the required levels The GPS data will be transmitted through port A first serial port if an active antenna is connected which has a good view to sky Pull up 100 kQ to the unused SDI inputs Active Antenna Bias Voltage The outpu
21. he NMEA 0183 standard This confidential document is the property of FALCOM and may not be copied or circulated without permission FALCOM WIRRLET COMMUPECATIONS Sette Page 24 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 7 2 3 Transport Message Start Sequence Payload Checksum End Sequence PSRF lt MID gt Data CKSUM lt CR gt lt LF gt 1 Message Identifier consisting of three numeric characters Input messages begin at MID 100 2 Message specific data Refer to a specific message section for lt data gt lt data gt definition 3 CHECKSUM is a two hex character checksum as defined in the NMEA specification Use of checksums is required on all input messages 4 Each message is terminated using Carriage Return CR Line Feed LF which is r n which is hex OD OA Because r n are not printable ASCII characters they are omitted from the example strings but must be sent to terminate the message and cause the receiver to process that input message CheckSum The checksum is 15 bit checksum of the bytes in the payload data The following pseudo code defines the algorithm used Let message to be the array of bytes to be sent by the transport Let msgLen be the number of bytes in the message array to be transmitted Clearly to say the string over which the checksum has to be calculated is between the and without characters and Index first ch
22. he receiver to process that input message Note e SiRF recommends the use of 300 ms I second or 400 ms 2 second for optimum performance This confidential document is the property of FALCOM and may not be copied or circulated without permission FALCOM Page 18 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 6 HARDWARE INTERFACE AND CONFIGURATION SIGNALS 6 1 Interfaces balls assignment of the JP14 R 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 i I I A A orientation 9 10 11 12 13 14 15 16 17 cut WEI Re 10 Controk lines for production test Do not use leave it open S CTER ee e 13 14 Not connected 15 17 ne Notconnected O ra NO iat ground o EE CGN Ot NI VANT hi Power supply for an active antenna B Lee ena Gate RF_IN a GPS signal from connected antenna 50 Ohms 1 575 GHz GND_RF Analogue grounds GND_RF VCCRF O Supply voltage of RF section 2 85VDC max 25mA Digital grounds OV ee ene I 27 NSRESET Do not use leave it open 28 T MARK _ O 1PPSTimeMarkOutput CMOS 29 BOOTSEL __ Boots the unit into the Update mode if it is set to HIGH CMOS VCC 30 NADC_CS O Control outputs Do not use leaveitopen CMOS 31 TIMERSYNC O Control outputs Do not use leave it open CMOS 32 cs2 O Control outputs Do not use leave it open CMOS VCCGSP3 a one output for baseband processor Do not use leave it CM
23. ifferent ground planes The pins RF_GND to both unit should be connected to analog ground the pins GND to digital ground see tables 1 and 2 respectively The two ground planes shall be separated planes are connected inside the receiver see figure 10 aoe Digital GND Analog GND Figure 10 Ground plane of the JP14 R Q GPS receivers 9 2 RF connection The JP14 R Q GPS receivers are designed to be functional by using either a passive patch antenna or an antenna connector with standard RF cables In order to make a properly RF connection the user has to connect the antenna points to the RF pins of the JP14 R Q or RF IN see tables 1 and 2 and RF grounds RF_GND respectively This confidential document is the property of FALCOM and may not be copied or circulated without permission G FALCOM Page 29 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 9 3 Soldering profile Figure 11 shows the recommended solder profile for Pb free JP14 R Q units C A Recommended solder paste SAC Area of melting point 217 219 C 2501 Max 250 C 240 _ 180 4 Temperature 160 S 3 3 E 3 100 120 seconds T T T T T T ai SEC Time Figure 11 Typical solder conditions temperature profile reflow conditions Consider for a long time in the soldering zone with temperature higher than 217 C has to be kept as short as
24. it FLASH and 1 Mbit SRAM 3 3 VDC 5 240 mW continuous mode Adaptive TricklePower ATP Push to Fix PTF For more details see chapter 5 4 40 to 85 C operation transportation and SDI1 SDO1 NMEA 38400 baud Msg GLL GGA RMC GSV GSA VTG 8 data bits no parity 1 stop bit All options related to this serial port are available upon request This confidential document is the property of FALCOM and may not be copied or circulated without permission FALCOM Page 11 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 5 TECHNICAL DESCRIPTION 5 1 Receiver Architecture The JP14 R Q OEM GPS receivers from FALCOM are new OEM GPS receiver products that feature the SiRFstarlll single chipset The core of JP14 R Q units is comprised of the GSC3 that includes the Digital and RF in a single chip The JP14 R Q are built around re configurable high output segmented matched filter in conjunction with a FFT processor which can search all 1023 chips of the GPS code simultaneously over a wide frequency range for fast initial acquisition with large uncertainties The flexibility of the core allows the core processing engine and memory to be reconfigured to track more than 20 satellites using the same hardware This flexibility make the JP14 R Q highly efficient engines for wide variety of location applications The core of JP14 R Q contains a built in sequencer which handles all the high rate interrupts for GP
25. ive TricklePower mode AMP ETT Re nno 15 343 PUSPO EK MOJE T a a E E E A 16 5 4 4 NMEA input message for ATP amp PTF Mode 17 6 HARDWARE INTERFACE AND CONFIGURATION SIGNALS e E eee 19 6 1 Interfaces balls assignment of the JP14 R iiiiii 19 6 2 Interfaces balls assignment of the J4P14 Q_ eeeeeeeeenenteeeeeeeeeeeeeeeees 20 6 Coniiguratiprandimingsigndls sf nen 21 6 4 Serial communication signals e eee soi 21 OoPbGinpilesighiale RE 22 T SOFTWARE INTERFACE a aae e ae aaa a 23 This confidential document is the property of FALCOM and may not be copied or circulated without permission FaLcoM Page 2 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 TI SRE binary dataimessage a a a cee seers tee re E ee tee 23 T2NMEA datamessage RL 24 L2 NMEA output messages T To O 24 22 2 NMEA mpu messages aa a e NO cere nnn 24 72253 nSP MeS SAGE TO 25 8 MECHANICAL DRAW a E 26 9 LAYOUT RECOMMENDATION nn 29 9lGround planesttt n nn 29 Si2 REceonnediole ehe ie 29 S Spldermgiprol e i GG 2 30 10 FIRST STEPS TO MAKE IT WORK 31 WIARPENDDE neo 33 11 1 How to set the target GPS receiver into power saving modes 33 This confidential document is the property of FALCOM and may not be copied or circulated without permission GG FALCOM Page 3 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 VERSION
26. lapses and no GPS fix is obtained the target receiver is set into the sleep mode for up to MaxOffTime in ms It means the target receiver searches for MaxAcqTime in ms sleeps for MaxOffTime in ms searches again for MaxAcqTime in ms etc It can be set to a value between 1000 No Limit lt MaxOffTimeMs gt It specifies the Maximum Off Time in milliseconds how long the target receiver should remain off sleep mode before making another attempt to navigate This mode is enabled if the target receiver is turned on and acquires satellites but does not navigate This mode is disabled if the target receiver is turned on acquires and navigates It can be set to a value between 1000 1800000 lt TPAdaptive gt It enables disables the Adaptive TricklePower ATP mode if the value of the lt Mode gt parameter is set to 1 otherwise it does not have any effect It can be set to 0 It disables the Adaptive TricklePower ATP mode 1 It enables the Adaptive TricklePower ATP mode lt CS gt CHECKSUM is a two hex character as defined in the NMEA specification Use of checksums is required on all input messages For more detailed information refer to the chapter 7 2 3 page 25 lt CR gt lt LF gt Each message is terminated using Carriage Return CR Line Feed LF which is hex OD OA Because OD OA are not printable ASCII characters they are omitted from the example strings but must be sent to terminate the message and cause t
27. not be copied or circulated without permission FALCOM Page 6 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 The internal GSW3 software completes the package providing flexible system architecture for standalone GPS based products Please consult SIRF www sirf com for special information about the GSC8f SiRFstarlll chipset Figure 1 The FALCOM JP14 R GPS receiver top and bottom view SiRF Powered JP14 Q DANON ONINO OLII 01612012401624 Figure 2 The FALCOMJP14 Q GPS receiver top and bottom view Users are advised to proceed quickly to the chapter Security and read the hints carefully to secure its optimal use 1 2 Used abbreviations Abbreviation Description A GPS Assisted Global Positioning System BGA Ball Grid Array DGPS Differential GPS DOP Dilution of Precision GPS Global Positioning System GGA GPS Fixed Data LNA Low Noise Amplifier This confidential document is the property of FALCOM and may not be copied or circulated without permission FALCOM Page 7 WALLETS COMICATONE SMi JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 Abbreviation Description NMEA National Maritime Electronics Association PRN Pseudo Random Noise Number The Identity of GPS satellites RF Radio Frequency RP Receive Protocol RTC Real Time Clock RTCM Radio Technical Commission for Maritime Service
28. on Mask Elevation tracking and navigation masks 0x8C 140 Power Mask Power tracking and navigation masks 0x8D 141 Editing Residual Not implemented 0 x 8E 142 Steady State Detection not used Not implemented 0 x 8F 143 Static Navigation Configuration for static operation 0x90 144 Poll Clock Status Poll Polls the clock status 0x92 146 Poll Almanac Polls for almanac data 0x93 147 Poll Ephemeris Polls for ephemeris data 0x94 148 Flash Update On the fly software update 0x95 149 Set Ephemeris upload Sends an existing ephemeris to the receiver 0x96 150 Switch Operating Mode Test mode selection SV ID and period This confidential document is the property of FALCOM and may not be copied or circulated without permission GFALCOM WELLS COMMUPSCAT Page 23 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 0x97 151 Set Trickle Power Parameters Push to fix mode duty cycle and on time 0x98 152 Poll Navigation Parameters Polls for the current navigation parameters Hex ASCII Name Description OxA5 165 Set UART Configuration Protocol selection baud rate data bits stop bits and parity 0xA6 166 Set Message Rate SiRF binary message output rate OxA7 167 Low Power Acquisition Parameters Low power configuration parameters 0 x B6 182 Set UART Configuration Obsolete Table 7 SIRF Input Messages 7 2 NMEA data message 7 2 1 NMEA output messages Table 7 lists all NMEA output messag
29. on Sirf iSiIRFdemo pdf gt www falcom deiSupportiDownload iDocumentation iSirfiSiRFdemo zip This confidential document is the property of FALCOM and may not be copied or circulated without permission FALCOM Page 32 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 11 APPENDIX 11 1 How to set the target GPS receiver into power saving modes By means of SiRFdemo software version 3 81 from SIRF the user is able to configure this operation mode with desired setting The input message is accepted if the GPS receiver operates in the NMEA mode else the input message will be ignored The commands above cannot be implemented if the target receiver operates in the SIRF Binary mode In order to set the receiver into the ATP or PIF mode via input messages start the SiRFdemo software version 3 81 select the COM port where GPS receiver is connected and the baud rate to 38400 bps and then open the COM port If the receiver is operating in SIRF binary mode switch it to the NMEA mode select Switch to NMEA protocol from the Action menu of main window After the receiver has obtained a GPS fix it can be set in the ATP or PTF mode To do this open Action menu from main window and start Transmit Serial Message On the appeared dialog box select NMEA protocol from the Protocol Wrapper option and type the following command onto the memo field as shown in the Figure 14 PSRF107 1 400 2000 60000 60000 1 sets the target receiver into the AT
30. on of the kind of antenna The GPS receiver continuously tracks all satellites in view thus providing accurate satellite position data The physical interface to the unit application is made through provided balls This is required for controlling the unit receiving GPS location data transferring data and providing power supply line The JP14 R Q units incorporate 4 megabits of flash memory required for storing the GPS software and user application programs and 1 megabit of static RAM Compared to the JP14 S the JP14 R is more optimized for location applications requiring high performance in a very smaller form factor just 10 x 24 mm package ideal for devices with limited onboard processing power While the JP14 Q comes more smaller than JP14 R just 15 x 17 mm package The JP14 R Q concept builds perfect basis for the design of high sensitive low power compact and cost efficient state of the art GPS enabled system solutions for target platforms such as mobile phones automotive systems portable computing devices and embedded consumer devices The FALCOM JP14 R and JP14 Q are also designed to be entire products such as AVL tracking unit handheld GPS The core of the JP14 R and JP14 Q units is comprised of the GSC3f that comes with Digital and RF in a single chip and the GSW3 software stored into the on chip 4 megabit FLASH that is API compatible with previous GSW2 software This confidential document is the property of FALCOM and may
31. osition Velocity 5 3 1 4 Datum WGS 84 5 3 1 5 Time fo First Position GSM 3G CDMA Hot start Hot start open sky Cold start L1 1575 42 MHz 1 023 MHz chip rate 20 Hz 6 12 5 25 and 49 MHz 16 bit Autonomous 10 meters CEP without SA SBAS lt 5 meter 0 1 meters second without SA 1 microsecond synchronized to GPS time 1 to 5 meters typical 0 05 meters second typical lt 20 sec average lt 20 sec average lt 16 sec average lt 18 sec average lt 1 sec average lt 42 sec average This confidential document is the property of FALCOM and may not be copied or circulated without permission G FALCOM Page 13 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 5 3 1 6 Sensitivity GSM 3G CDMA Tracking Hot Start Cold Start 15 dBHz 15 dBHz 15 dBHz 13 dBHz 15 dBHZ 30 dBHZ The sensitivity value is specified at the correlator On a JP14 Receivers using GSW3 firmware with the supplied antenna 17 dBHz is equivalent to 155 dBm Other board and antenna characteristics will vary With SIRFLock firmware 5 3 1 7 Dynamic Conditions Altitude Velocity Acceleration Jerk 5 3 1 8 DC Power Main power Core power Continuous mode Backup battery power 5 3 1 9 Serial Port Electrical interface Protocol messages 5 3 1 10 Time 1PPS Pulse Level Pulse duration Time reference 18 000 meters 60 000 feet max lt 515 meters second 1000 kn
32. ots max 49 max 20 meters second max 3 3V DC 5 1 5V DC approx 72 mA at 3 3 V DC with an active antenna FAL ANT 3 3 V DC 5 full duplex serial communication CMOS level SIRF binary and NMEA 0183 with a baud rate selection SIRF binary position velocity altitude status and control NMEA GGA GLL GSA GSV RMC VTG CMOS 1 5 us At the pulse positive edge This confidential document is the property of FALCOM and may not be copied or circulated without permission G FALCOM Page 14 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 5 4 Power management modes overview There are three basic operating modes in which the JP14 family operates during use Each mode is used to accomplish a different task during the process of acquiring and maintaining the GPS information The JP14 family include all the functionality necessary to implement the three different modes of operation By default the JP14 family runs in normal mode continuous mode All three different operating modes are described below Additionally two of them such as Adaptive TricklePower ATP and Push to Fix PTF are designed as power saving modes This chapter describes the power management considerations of JP14 family based on the JP14_REVO4A PCB version 5 4 1 Normal Operation mode In this default implementation of normal mode the JP14 family is fully powered and performs the function of signal search acquisition me
33. ous mode full power Sets the target receiver into the Adaptive TricklePower TP mode 2 Sets the target receiver into the Push To Fix PTF mode lt OnTimeMs gt It defines the OnTime period in milliseconds the receiver will stay in full power state until a position solution is made and estimated to be This confidential document is the property of FALCOM and may not be copied or circulated without permission G FALCOM Page 17 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 reliable Please note that in harsh tracking environments the receiver automatically switches to full power state to improve navigation performance even if the defined OnTime has been expired When the satellites are sorted according their signal strength the fourth satellite determines if the transition to Standby mode hibernate state will occur or not It can be set to a value between 200 900 OnTime period in milliseconds lt LPiInterval gt It defines the complete interval of time in milliseconds the receiver will stay in full power and Standby mode hibernate state It can be set to a value between 1000 10000 The interval of time in milliseconds for Adaptive TricklePower ATP mode 10000 7200000 The interval of time in milliseconds for Push To Fix PTF mode lt MaxAcqTimeMs gt It specifies the Maximum Acquire Time in milliseconds how long the target receiver should attempt to acquire satellites and navigate If this time e
34. possible to prevent component and substrate damages Peak temperature must not exceed 250 C Please note that this soldering profile is a reference to the soldering machine FALCOM utilizes This profile can vary by using different paste types and soldering machines and it should be adapted to the customer application NO liability is assumed for any damage to the module caused while soldering Reflow profiles in tabular form Profile Feature Values Ramp Up Rate lt 3 K second Preheat zone Temperature Range 160 180 C Time 100 120 seconds Peak zone Peak Temperature 240 C 250 C max Time above 217 C 65 75 seconds Ramp Down Rate lt 3 K second Note JP14 modules can accept only one reflow process This confidential document is the property of FALCOM and may not be copied or circulated without permission FALCOM Page 30 JP14 R JP14 Q Faccom GPS Receivers 10 FIRST STEPS TO MAKE IT WORK Also connect all GNDs to ground VCC 3 3 VDC BACKUP BATTERY ACTIVE ANTENNA ANTENNA SUPPLY VOLTAGE 2 0 VDC Figure 12 The minimum hardware interface of JP14 R Q to get started The same set up connection can also be made to the GPS receiver but take into consideration the allocation of the receiver s pins refer to the Tables 1 and 2 Antenna Power The antenna connection is the most critical part of PCB routing Before placing t
35. re SDO2 For user s application It is not supported by default GSW3 1 0 This confidential document is the property of FALCOM and may not be copied or circulated without permission G FALCOM Page 21 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 6 5 DC input signals VCC This pin is the main DC power supply for 3 3 V 5 powered boards JP14 R Q RF_IN Active antennas have an integrated low noise amplifier They can be directly connected to this pin RF_IN If an active antenna is connected to RF_IN the integrated low noise amplifier of the antenna needs to be supplied with the correct voltage through pin VANT Caution Do not connect or disconnect the antenna while the JP14 R and JP14 Q are running Caution The RF_IN is always fed from the input voltage on the VANT Do not use any input voltage on the RF_IN pin VANT This pin is an input and reserved for an external DC power supply for an active antenna The antenna bias for an external active antenna can be provided in two ways to pin VANT In order to use a 5 V or 12 V active GPS antenna the VANT has to be connected to 5 V 12 V external power supply respectively The other possibility is available when you connect the VCCRF output which provides 2 85 V to VANT so that an antenna with 2 85 V supply voltage can be used Hint The input voltage on the VANT should be chosen in according to the antenna to be used Note The GPS receivers JP14 R Q have
36. s SDI Data input SDO Data output SA Selective Availability WAAS Wide Area Augmentation System MSK Minimum Shift Keying PCB Printed Circuit Board PRN Pseudo random noise IF Intermediate Frequency A D Analog Digital 1 3 Related documents 1 SIRF binary and NMEA protocol specification www falcom de Support Download Documentation Sirf SiRFmessages_SSIII zip 2 SIRF demo software and manual www falcom de Support Download Documentation Sirf SiRFdemo pdf www falcom de Support Download Software amp Tools Sirf SiRFdemo zip This confidential document is the property of FALCOM and may not be copied or circulated without permission G FALCOM Page 8 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 2 SECURITY This chapter contains important information for the safe and reliable use of the GPS receiver Please read this chapter carefully before starting to use the GPS receiver 2 1 General information The Global Positioning System uses satellite navigation an entirely new concept in navigation GPS has become established in many areas for example in civil aviation or deep sea shipping It is making deep inroads in vehicle manufacturing and before long everyone of us will use it this way or another The GPS system is operated by the government of the United States of America which also has sole responsibility for the accuracy and maintenance of the system The system is constantly being improved
37. scription is copyrighted by FALCOM WIRELESS COMMUNICATIONS GmbH with all rights reserved No part of this document may be produced in any form without the prior written permission of FALCOM WIRELESS COMMUNICATIONS GmbH FALCOM WIRELESS COMMUNICATIONS GmbH No patent liability is assumed with respect to the use of the information contained herein This confidential document is the property of FALCOM and may not be copied or circulated without permission FALCOM Page 5 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 1 INTRODUCTION 1 1 General This description is focussed on the GPS receivers of the FALCOM JP14 R and JP14 Q from FALCOM GmbH JP14 R Q a new of highly integrated low power GPS products based on a 0 13 micron CMOS process of the SiRFstarlll GSC3f architecture are single board solutions with increased to 20 parallel channel receiver Both units the JP14 R and JP14 Q for the first time combine a complete A GPS digital baseband processor RF front end and 4 megabits of flash memory in a single 10 mm x 24 mm package providing manufacturers of cell phones PDAs and other portable and wireless devices with a drop in AGPS solution they can use to deliver real time location and navigation capabilities in a simpler smaller design with extended battery life Each unit in a single package will deliver exceptional sensitivity low power consumption and extremely fast time to first fix TTFF in a compact 40 pin BGA pack
38. t voltage at the antenna cable can be used to power the bias voltage of the antenna provided can This confidential document is the property of FALCOM and may not be copied or circulated without permission FALCOM Page 31 Version 1 0 5 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 make sure that the antenna runs down to 2 7 V bias voltage and the current does not exceed 20 mA Backup Battery In case of a power interruption on pin VCC the real time clock and backed up SRAM are continually supplied through V_BAT The voltage at this pin has to be 3 V DC 5 If you do not use a backup battery connect this pin to GND or leave it open The quickest way to get first results with the JP14 R Q is to use the JP14 R Q adapter board together with the GPS Evaluation Kit and the SiRFdemo program Figure 13 Evaluation board with connected JP14 R Q GPS receiver The GPS Evaluation Kit contains Evaluation Box JP14 sample with soldered antenna cable power supply AC DC adapter Type FW738 05 Output 5VDC 1 3 A active GPS antenna FAL ANT 3 RS232 level shifter RS232 cable to your computer GPS Evaluation Kit user s manual The GPS Evaluation Kit is not included in the delivery package of the JP14 R Q GPS receiver The GPS Evaluation Kit will have to be purchased separately The SIRFdemo manual and software are available on FALCOM s Website for free download gt www falcom deiSupportiDownload iDocumentati
39. the bottom view on JP14 R and provides an overview of the mechanical dimensions of the pointed balls This confidential document is the property of FALCOM and may not be copied or circulated without permission G FALCOM ALLES COMMAPICATOND cis E E R N E N E si A s Y E E 3 E 2 I o n EN E a4 E a E S E S El m E Ci a Y E el s I E e 2 E s E E s 1 g El 4 E sl el E e I 0 0 9 10 mm 7 80 mm n 6 50 mm 5 10 mm 3 80 mm 2 50 mm 1 20 mm IO Round ball diamete Page 27 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 Figure 8 The mechanical draw of the JP14 R Figure 9 shows the bottom view on JP14 Q and provides an overview of the mechanical dimensions of the pointed balls E z Es 31 ER 1 3 a Lei 3 Tis 8 t Elo Ww 3 95 mm 265 mm T35 ete 13 85 mm 12 55 mm _1125 mm 2 259m 5 8 65 mm 7 35 mm 6 05 mm 4 75 mm _ 345 mm 2 15 mm S gt Round ball diamete Figure 9 The mechanical draw of the JP14 Q This confidential document is the property of FALCOM and may not be copied or circulated without permission G FALCOM ALLE BS COMMPICATOHI cis Page 28 JP14 R JP14 Q Faccom GPS Receivers Version 1 0 5 9 LAYOUT RECOMMENDATION 9 1 Ground planes JP14 R Q GPS receivers need two d
40. wer is less than in the full power state Standby state In the standby state power remains applied to the JP14 family but the RF section is completely powered off and the clock to the baseband is stopped About 600 UA of current is drawn in this state for the internal core regulator RTC and battery backed RAM The receiver enters this state when a position fix has been computed and reported Typically before shutting down the RTC wakeup register is programmed to wake up the system sometime in the future Diagram for ATP mode This period is vanable S and can take up to 45 seconds for ephemens collection and RTC calibration 460 ms 540 ms Remark The environment temperature may also affect the power consumption in the Standby state Figure 4 Three system states into the ATP mode The transition from Standby state back to the full power is generated through the internal RTC which transmits a wake up signal to the GPS engine to switch it on The JP14 is woken up and begins to acquire the on view satellites and to collect their data Under normal tracking conditions the receiver is set for a specific update period range from 1 to 10 seconds and a specific sampling time during each period range from 200 to 900 ms The receiver turns to full power state for the sampling time to collect data and then operates in Standby state for the remainder of the update period The next full power state is initiated by an RTC
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