RXM-GPS-F4-T Linx Technologies, RXM-GPS-F4-T Datasheet

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RXM-GPS-F4-T

Manufacturer Part Number
RXM-GPS-F4-T
Description
GPS Modules F4 Series GPS Recvr Module Tape and Reel
Manufacturer
Linx Technologies
Datasheet

Specifications of RXM-GPS-F4-T

Rohs
yes
Frequency Band
1575.42 MHz
Number Of Channels
48
Time To First Fix (cold Start)
32 s
Acquisition Sensitivity
- 159.5 dBm
Horizontal Position Accuracy
3 m
Operating Supply Voltage
1.8 V
Operating Supply Current
56 mA
Interface Type
Serial
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Dimensions
15 mm x 13 mm x 2.2 mm
Minimum Operating Temperature
- 30 C
F4 Series
GPS Receiver Module
Data Guide

Related parts for RXM-GPS-F4-T

RXM-GPS-F4-T Summary of contents

Page 1

... GPS Receiver Module F4 Series Data Guide ...

Page 2

... All RF products are susceptible to RF interference that can prevent communication. Lack of good sight of the GPS satellites (open sky) can affect the accuracy of a position fi prevent a fi x entirely. Do not use any Linx product over the limits in this data guide. ...

Page 3

... Description 1 Features 1 Applications 1 Ordering Information 2 Electrical Specifi cations 2 Absolute Maximum Ratings 3 Pin Assignments 4 Pin Descriptions 4 A Brief Overview of GPS 5 Client Generated Extended Ephemeris (CGEE) 5 Time To First Fix (TTFF) 6 Module Description 6 Backup Battery 7 Power Supply Requirements 7 The 1PPS Output 7 Antenna Considerations 8 ...

Page 4

NMEA Input Messages 18 19 100 – SetSerialPort 20 101 – NavigationInitialization 21 103 – Query / Rate Control 23 104 – LLANavigationInitialization 24 105 – Development Data On / Off Master Development System 25 Board Layout Guidelines 26 Pad ...

Page 5

... CGEE allows 3-day prediction • No programming necessary Applications Include • Positioning and Navigation • Location and Tracking • Security/Loss-Prevention GPS MODULE 0.512 (13.00) RXM-GPS-F4 LOT GRxxxx 0.087 (2.20) Figure 1: Package Dimensions • No external RF components needed (except an antenna) • No production tuning • Direct serial interface • ...

Page 6

... Ordering Information Ordering Information Part Number RXM-GPS-F4-x MDEV-GPS- “T” for Tape and Reel, “B” for Bulk Reels are 1,000 pieces Electrical Specifi cations Quantities less than 1,000 pieces are supplied in bulk Figure 2: Ordering Information Electrical Specifi cations F4 Series GPS Receiver Specifi ...

Page 7

Receiver Section Receiver Sensitivity Tracking Navigation Cold Start Acquisition Time Hot Start (Open Sky) Hot Start (Indoor) Cold Start Cold Start, CGEE Position Accuracy Autonomous SBAS Altitude Velocity Chipset Frequency Channels Update Rate Protocol Support 1. VCC = 1.8V 2. ...

Page 8

... Pin Assignments Figure 5: F4 Series GPS Receiver Pinout (Top View) Pin Descriptions Pin Descriptions Pin Number Name 1 GPIOD 2 GPIOE 3 1PPS GPIOC /RESET 9 RFPWRUP 10 ON_OFF 12 VCC GPIOA 15 GPIOB 16 18, 20, 21, 22 GND ...

Page 9

... Client Generated Extended Ephemeris (CGEE) CGEE is a type of assisted GPS (AGPS) where the receiver uses the ephemeris data broadcast by the satellites to calculate models of each visible satellite’s future location. This allows the receiver to store days worth of ephemeris data and results in faster TTFF. – ...

Page 10

Time To First Fix (TTFF) TTFF is often broken down into three parts: Cold: A cold start is when the receiver has no accurate knowledge of its position or time. This happens when the receiver’s internal Real Time Clock (RTC) ...

Page 11

... The 1PPS Output The 1PPS line outputs 1 pulse per second on the rising edge of the GPS second when the receiver has an over-solved navigation solution from fi more satellites. The pulse has a duration of 200ms with the rising edge on the GPS second ...

Page 12

... Passive antennas are simply an antenna tuned to the correct frequency. Active antennas add a Low Noise Amplifi er (LNA) after the antenna and before the module to amplify the weak GPS satellite signals. For active antennas, a 300 ohm ferrite bead can be used to connect the the RFIN line to an external supply for the antenna ...

Page 13

... ON_OFF Module Power Figure 7: F4 Series GPS Receiver Power Control If the module is in Full Power mode, a pulse on the ON_OFF line initiates an orderly shutdown into Hibernate mode. If the module is in Hibernate mode, a pulse transistions the module into Full Power Mode. If the module is in Push-to-fi ...

Page 14

Module Power-up Sequence The module requires a specifi c sequence to power up and begin normal operation. When power is fi rst applied the module enters a “ready-to-start” state while the Real Time Clock (RTC) starts up and settles. It ...

Page 15

Module Power-down Sequence The module requires a controlled power-down sequence. Uncontrolled removal of power while the module is operating carries the risk of data corruption. The consequences of this corruption range from longer TTFF to complete system failure. The appropriate ...

Page 16

Typical Applications VCC VCC RX TX µP 1.8V IN OUT GND GND Figure 10: Circuit Using the F4 Series Module with a Passive Antenna VCC VCC Level RX Shifter TX µP GND 1.8V 2.2k IN OUT GND GND Figure 11: ...

Page 17

... GPS development in a small command set. The SiRF Binary protocol uses BYTE data types and allows more detailed control over the GPS receiver and its functionality using a much larger command set. Although both protocols have selectable baud rates, it’s recommended that SiRF Binary use 115,200bps ...

Page 18

... Update the application with the parsed fi eld values. • Clear the receive buffer and be ready for the next set of messages. Writing NMEA input messages: • Initialize a serial interface to match the serial data structure of the GPS receiver. • Assemble the message to be sent with the calculated checksum. ...

Page 19

... Figure 13: Position Indicator Values Units Description GGA protocol header hhmmss.sss ddmm.mmmm N N=north or S=south dddmm.mmmm E E=east or W=west 1 See Figure 11 08 Range 0 to 12. 1.1 Horizontal Dilution of Precision 63.8 meters M meters 15.2 meters M meters second Null fi elds when DGPS is not used 0000 *64 End of message termination – – 15 ...

Page 20

... Figure 15: GNSS DOP and Active Satellites Example Units Description GLL protocol header ddmm.mmmm N N=north or S=south dddmm.mmmm E E=east or W=west hhmmss.sss A A=data valid or V=data not valid A=autonomous, D=DGPS, N=Data A not valid *52 End of message termination Units Description GSA protocol header A See Figure 14 3 1=No fi x, 2=2D, 3=3D 24 ...

Page 21

Mode 1 Values Value Description M Manual – forced to operate mode A Automatic – allowed to automatically switch 2D/3D Figure 16: Mode 1 Values GSV – GNSS Satellites in View Figure 17 below contains the ...

Page 22

... Description RMC protocol header hhmmss.sss A A=data valid or V=data not valid ddmm.mmmm N N=north or S=south dddmm.mmmm E E=east or W=west 2.69 knots TRUE 79.65 degrees 100106 ddmmyy degrees Not available, null fi eld E=east or W=west (not shown) A=autonomous, D=DGPS, N= Data A not valid *53 End of message termination – – 18 ...

Page 23

... Figure 19: Course Over Ground and Ground Speed Example Units Description VTG protocol header 79.65 degrees Measured heading T TRUE degrees Measured heading (N/A, null fi eld) M Magnetic 2.69 knots Measured speed N Knots 5.0 km/hr Measured speed K Kilometer per hour A=autonomous, D=DGPS, N= Data A not valid *38 End of message termination – – 19 ...

Page 24

NMEA Input Messages The following outlines the serial commands input into the module for confi guration. By default, the commands are input at 9,600bps, 8 data bits, no parity and 2 stop bits. Serial Data Structure Name Example Start Sequence ...

Page 25

Query Query Figure 21: Message ID Values 100 – SetSerialPort This command message is used to set the protocol (SiRF binary or NMEA) and/or the communication parameters (baud rate). Generally, this command is used to switch the module back to ...

Page 26

... Example Units Description PSRF101 protocol header -2686700 meters X coordinate position -4304200 meters Y coordinate position 3851624 meters Z coordinate position 96000 Hz Clock Offset 497260 seconds GPS Time Of Week 921 GPS Week Number 12 Range See Figure 24 *1F End of message termination – – ...

Page 27

Query / Rate Control This command is used to control the output of standard NMEA messages GGA, GLL, GSA, GSV, RMC and VTG. Using this command message, standard NMEA messages may be polled once, or setup for periodic ...

Page 28

MSGValues Value Description 0 GGA 1 GLL 2 GSA 3 GSV 4 RMC 5 VTG 6 MSS (not supported) 7 Not defi ned 8 ZDA 9 Not defi ned Figure 26: MSG Values – – 24 ...

Page 29

... Latitude position (Range 90 to –90) Longitude position (Range 180 to degrees –180) 0 meters Altitude position Clock Offset of the Evaluation 96000 Hz Receiver1 237759 seconds GPS Time Of Week Extended GPS Week Number (1024 1946 added) 12 Range See Figure 28 *07 End of message termination – – 25 ...

Page 30

... Default setting is debug mode off. Figure 29: Development Data On / Off Example 117 – System Turn Off This message requests that the GPS receiver perform an orderly shutdown and switch to hibernate mode. Figure 30 below contains the values for the following example: $PSRF117,16*0B ...

Page 31

PowerManagement This command sets the power mode to Full Power, Adaptive Trickle Power, or Push-to-Fix mode. The table below contains the values for the following example to set the receiver to Adaptive Trickle Power mode: $PLSC,200,2,200,3000,300000,30000*0D Power Management ...

Page 32

The receiver outputs a response to this command. Figure 33 below contains the response for the above command: $PLSR,200,1,2,300,1000,300000,30000*02 Power Management Response Example Name Example MID $PLSC,200 Valid Mode OnTime 200 LP Interval 3000 MaxAcqTime 300000 MaxOffTime 30000 PushToFixPeriod Checksum ...

Page 33

Poll Software Version Figure 34 below contains the values for the following example to poll the SiRF and Linx software versions: $PLSC,201*13 Poll Software Version Command Example Name Example MID $PLSC,201 Checksum *0D <CR> <LF> Figure 34: Poll ...

Page 34

StaticNavigation This command is used to query, enable, and disable static navigation. Figure 36 below contains the values for the following example to disable static navigation: $PLSC,202,2*0E StaticNavigation Example Name Example MID $PLSR,202 Command 2 Checksum *0E <CR> ...

Page 35

SetIO Figure 38 below contains the values for the following example to get GPIOA as an input: $PLSC,211,A,0,0*7F SetIO Example Name Example MID $PLSC,211 GPIO Number A Direction 0 State 0 Checksum *7F <CR> <LF> Figure 38: SetIO ...

Page 36

ReadInput Figure 40 below contains the values for the following example to read the state of an input: $PLSC,212,A*7C ReadInput Example Name Example MID $PLSC,212 GPIO Number A Checksum *7C <CR> <LF> Figure 40: ReadInput Example The receiver ...

Page 37

WriteOutput Figure 42 below contains the values for the following example to write the state of GPIOA to low: $PLSC,213,A,0*61 WriteOutput Example Name Example MID $PLSC,213 GPIO Number A State 0 Checksum *61 <CR> <LF> Figure 42: WriteOutput ...

Page 38

Query: Get Confi guration and GPIO Last State Figure 44 below contains the values for the following example to read the confi guration and state of all of the GPIO lines: $PLSC,214*17 Query Example Name Example MID $PLSC,214 ...

Page 39

Query: Get Confi guration and GPIO Current State Figure 46 below contains the values for the following example to read the confi guration and state of all of the GPIO lines: $PLSC,215*16 Query Example Name Example MID $PLSC,215 ...

Page 40

For some further examples of this command: Set GPIO 1 to low Input command: Output response: $PLSC,215*16 $PLSR,215,5,1,0,0,10,0,1,13,0,1,14,0,1,15,0,1*00 – – 36 ...

Page 41

... Figure 48: The F4 Series Master Development System The development board includes a power supply, a prototyping area for custom circuit development, and an OLED display that shows the GPS data without the need for a computer. A USB interface is also included for use with a PC running custom software or the included development software ...

Page 42

Board Layout Guidelines The module’s design makes integration straightforward; however still critical to exercise care in PCB layout. Failure to observe good layout techniques can result in a signifi cant degradation of the module’s performance. A primary layout ...

Page 43

Each of the module’s ground pins should have short traces tying immediately to the ground plane through a via. Bypass caps should be low ESR ceramic types and located directly adjacent to the pin they are serving. A 50-ohm coax ...

Page 44

Microstrip Details A transmission line is a medium whereby RF energy is transferred from one place to another with minimal loss. This is a critical factor, especially in high-frequency products like Linx RF modules, because the trace leading to the ...

Page 45

Production Guidelines The modules are housed in a hybrid SMD package that supports hand and automated assembly techniques. Since the modules contain discrete components internally, the assembly procedures are critical to ensuring the reliable function of the modules. The following ...

Page 46

Automated Assembly For high-volume assembly, most users will want to auto-place the modules. The modules have been designed to maintain compatibility with refl ow processing techniques; however, due to their hybrid nature, certain aspects of the assembly process are far ...

Page 47

... For more complex RF solutions, Apex Wireless, a division of Linx Technologies, creates optimized designs with RF components and fi rmware selected for the customer’s application. Call +1 800 736 6677 (+1 541 471 6256 if outside the United States) for more information ...

Page 48

... Disclaimer Linx Technologies is continually striving to improve the quality and function of its products. For this reason, we reserve the right to make changes to our products without notice. The information contained in this Data Guide is believed to be accurate as of the time of publication. Specifi cations are based on representative lot samples. ...

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