Tyco Electronics A1080-A User Manual

GPS Receivers A1080-A
A description of Tyco Electronics’
User’s Manual
Version 2.3
Hardware Revision 01
This page was intentionally left blank.
Revision History
Revision History
Rev. Date Description
1.0 10-18-06 Initial Draft.
1.1 12-04-06 First released revision
1.2 12-08-06 Application note: Antenna current limiter
1.4 03-13-07 Some minor changes and updates
2.0 03-23-07 New design, adjustments
2.1 06-01-07 Correction solder pads size
2.2 07-03-07 Minor updates serial port configuration
2.3 06-07-07 Application note: reset pin mm-dd-yy
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Disclaimer
Disclaimer
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF TYCO ELEC­TRONICS CORPORATION/POWER SYSTEMS (TYCO ELECTRONICS). IT MAY NOT BE COPIED OR TRANSMITTED BY ANY MEANS, PASSED TO OTHERS, OR STORED IN ANY RETRIEVAL SYSTEM OR MEDIA, WITHOUT PRIOR CONSENT OF TYCO ELECTRONICS OR ITS AUTHORIZED AGENTS.
THE INFORMATION IN THIS DOCUMENT IS, TO THE BEST OF OUR KNOWLEDGE, ENTIRELY CORRECT. HOWEVER, TYCO ELECTRONICS CAN NEITHER ACCEPT LIABILITY FOR ANY INACCURACIES, OR THE CONSEQUENCES THEREOF, NOR FOR ANY LIABILITY ARISING FROM THE USE OR APPLICATION OF ANY CIRCUIT, PRODUCT, OR EXAMPLE SHOWN IN THE DOCUMENT.
THE PRODUCT (HARD- AND SOFTWARE) DESCRIBED IN THIS DOCUMEN­TATION IS NOT AUTHORIZED FOR USE IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF TYCO ELEC­TRONICS.
THIS DOCUMENT MAY PROVIDE LINKS TO OTHER WORLD WIDE WEB SITES OR RESOURCES. BECAUSE TYCO ELECTRONICS HAS NO CONTROL OVER SUCH SITES AND RESOURCES, TYCO ELECTRONICS SHALL NOT BE RESPONSIBLE FOR THE AVAILABILITY OF SUCH EXTERNAL SITES OR RESOURCES, AND DOES NOT ENDORSE AND IS NOT RESPONSIBLE OR LIABLE FOR ANY CONTENT, ADVERTISING, PRODUCTS, OR OTHER MATERIALS ON OR AVAILABLE FROM SUCH SITES OR RESOURCES. TYCO ELECTRONICS SHALL NOT BE RESPONSIBLE OR LIABLE, DIRECTLY OR INDIRECTLY, FOR ANY DAMAGE OR LOSS CAUSED OR ALLEGED TO BE CAUSED BY OR IN CONNECTION WITH USE OF OR RELIANCE ON ANY SUCH CONTENT, GOODS OR SERVICES AVAILABLE ON OR THROUGH ANY SUCH SITE OR RESOURCE.
TYCO ELECTRONICS RESERVES THE RIGHT TO CHANGE, MODIFY, OR IMPROVE THIS DOCUMENT OR THE PRODUCT DESCRIBED HEREIN, AS SEEN FIT BY TYCO ELECTRONICS WITHOUT FURTHER NOTICE.
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Table of Content
Table of Contents
1 Introduction........................................................................................................7
1.1 Label ................................................................................................................. 7
1.2 Characteristics ..................................................................................................8
1.2.1 GPS Characteristics ................................................................................................... 8
1.2.2 Mechanical Characteristics......................................................................................... 8
1.3 Handling Precautions ........................................................................................8
2 Ordering Information.........................................................................................9
2.1 GPS Receiver A1080-A ....................................................................................9
2.2 Packing ............................................................................................................. 9
2.2.1 Packaging of the A1080-A.......................................................................................... 9
2.3 Additional Equipment ...................................................................................... 10
3 Quick Start........................................................................................................11
3.1 Minimum Configuration ................................................................................... 11
3.2 Antenna........................................................................................................... 12
3.3 Serial Port Settings .........................................................................................12
3.4 Improved TTFF ...............................................................................................12
4 Mechanical Outline ..........................................................................................13
4.1 Details Component Side A1080-A................................................................... 13
4.2 Details Solder Side A1080-A........................................................................... 14
5 Pin-out Information..........................................................................................15
5.1 Layout A1080-A ..............................................................................................15
5.2 Description A1080-A Signals .......................................................................... 15
5.3 General Comments .........................................................................................16
6 Electrical Characteristics................................................................................17
6.1 Operating Conditions ......................................................................................17
6.2 Absolute maximum ratings.............................................................................. 17
7 Mounting...........................................................................................................18
7.1 Proposed Footprint for Soldering ....................................................................18
7.2 Recommended Profile for Reflow Soldering ...................................................18
8 Use of Antenna.................................................................................................19
8.1 Connection of RF Signal ................................................................................. 19
8.2 Active Antenna................................................................................................ 20
9 Quality and Reliability......................................................................................21
9.1 Environmental Conditions ............................................................................... 21
9.2 Product Qualification .......................................................................................21
9.3 Production Test ............................................................................................... 21
10 Applications and Hints ..................................................................................22
10.1 Minimum Configuration ................................................................................. 22
10.2 Antenna Status Adaptation ...........................................................................22
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Table of content
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10.2.1 Antennas with Different Current Draw .................................................................... 22
10.2.2 Antennas with Different Current Draw incl. Current Limiter.................................... 23
10.3 VANT Pin (antenna voltage input pin) ...........................................................24
10.4 1PPS pin (1 pulse per second pin)................................................................ 25
10.5 Reset Signal.................................................................................................. 25
10.5.1 Reset Sources ........................................................................................................ 25
10.6 Battery Back-up............................................................................................. 27
11 Demonstration Kits........................................................................................28
11.1 Evaluation Kit A1080-A ................................................................................. 28
12 Related Information .......................................................................................29
12.1 Contact.......................................................................................................... 29
12.2 Related Documents....................................................................................... 29
13 List of Tables..................................................................................................31
14 List of Figures ................................................................................................31
GPS receiver A1080-A
1 Introduction
Tyco Electronics’ GPS module A1080-A is a highly integrated GPS receiver module that can be used as an SMT component. It is capable to receive signals from up to 20 GPS satellites and transferring them into position and timing information that can be read over a serial port. This new generation of GPS module combines small size and high-end GPS functionality at low power consumption:
Operable at 3.3V / 36mA (typ.) @ 1fix per second
Small form factor of 19 x 16.2 mm (0.75” x 0.64”)
Cost-effective antenna input
Single-sided SMD component, for reflow soldering
Tape & reel packaging
The A1080-A GPS receivers are available as off-the-shelf component, 100% tested and shipped in standard tape-and-reel package.
1.1 Label
The A1080-A label holds the following information:
Figure 1: A1080-A label
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GPS receiver A1080-A
1.2 Characteristics
The modules are characterized by the following parameters.
1.2.1 GPS Characteristics
Channels 20, parallel tracking Correlators 200.000 plus Frequency L1 (= 1575 MHz) Tracking Sensitivity -159dBm Position Accuracy Stand alone < 10m CEP (SA off) Horizontal Position Accuracy Stand alone < 2,5m CEP (SA off)
Obscuration recovery
(1)
0.1s
Hot start
(2)
< 1s
Warm
(3)
< 32s
Time To First Fix – TTFF (theoretical minimum values; values in real world may differ)
Cold
(4)
< 35s
Table 1: A1080 GPS characteristics
(1) The calibrated clock of the receiver has not stopped, thus it knows precise time (to the µs level). (2) The receiver has estimates of time/date/position and valid almanac and ephemeris data. (3) The receiver has estimates of time/date/position and recent almanac. (4) The receiver has no estimate of time/date/position, and no recent almanac.
1.2.2 Mechanical Characteristics
A1080-A Mechanical dimen­sions
Length Width Height
19mm, 0.75”
16.2mm, 0.64”
2.4mm, 0.095”
A1080-A Weight 1g, < 0.05oz
Table 2: A1080-A dimensions and weight
1.3 Handling Precautions
The GPS receiver module A1080-A is sensitive to electrostatic discharge (ESD). Please handle with appropriate care.
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GPS receiver A1080-A
2 Ordering Information
2.1 GPS Receiver A1080-A
The order number is built as follows:
V23993A1080A
V23993 stands for Tyco Electronics wireless and communication products, A1080A for the A1080-A module.
2.2 Packing
2.2.1 Packaging of the A1080-A
The A1080-A GPS module comes in a tape and reel package suitable for pick and place machines.
Figure 2: A1080-A tape specifications (1)
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GPS receiver A1080-A
Figure 3: A1080-A tape specifications (2)
2.3 Additional Equipment
V23993EVA1080A Evaluation Kit (including one module V23993A1080A)
Table 3: Additional equipment
A detailed description of the additional kit can be found in the according manuals.
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GPS receiver A1080-A
3 Quick Start
In order to allow an easy and quick start with the modules A1080-A, this chapter provides a short overview on the most important steps to receive NMEA messages with position information on a serial port.
3.1 Minimum Configuration
The following picture shows a recommended minimum configuration for NMEA out­put and commands sent and received via an RS232 interface based on the GPS module A1080-A.
Figure 4: Recommended minimum configuration A1080-A
Remarks:
Place C1 to C5 (here: 0.1µF) close to MAX3232. For capacity values see datasheet of actual component used.
Use 3.3V level shifter (MAX3232 or equivalent).
Use separate ground plane for antenna ground.
Antenna input impedance is 50Ohm. Match as close as possible.
Maximum allowed antenna current is 50mA. Consider a current limiter.
A battery back-up circuit for the RTC (Real Time Clock) should be consid-
ered (see
10.6
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GPS receiver A1080-A
Battery Back-up)!
NOTE: Please make sure that the A1080-A is either within an enclosure or addi­tionally shielded to reduce the influence of temperature fluctuations often generated by airflow.
3.2 Antenna
It is recommended to use an active GPS antenna with supply voltage of 3 to 5VDC and a current draw of 50mA maximum. The quality of the GPS antenna chosen is of paramount importance for the overall sensitivity of the GPS system. An active an­tenna should have a gain 20dB and a noise figure 1.5dB, which applies to more than 95% of the active antennas available in the market.
3.3 Serial Port Settings
The default configuration within the standard GPS firmware is:
Serial 0 (NMEA) 4800 baud, 8 data bits, no parity, 1 stop bit, no flow control
3.4 Improved TTFF
In order to improve the TTFF (Time To First Fix), it is recommended to support the RTC with a back-up power when no system power is available.
If the system or the GPS receiver alone should not be backed-up it is possible to support the restart procedure by providing position and date/time information to the module. This is described in the firmware manual. Please refer there to chapter “Start-up Support” in the document T.E. GPS Firmware A1080.
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GPS receiver A1080-A
4 Mechanical Outline
4.1 Details Component Side A1080-A
All dimensions in [mm, (inch)]
Figure 5: Mechanical outline component side A1080-A
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GPS receiver A1080-A
4.2 Details Solder Side A1080-A
Solder pad size: 1.0 x 0.8 All dimensions in [mm]
Figure 6
: Mechanical outline solder side A1080-A
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GPS receiver A1080-A
5 Pin-out Information
5.1 Layout A1080-A
Figure 7: Pin-out information A1080-A
5.2 Description A1080-A Signals
Pin Symbol Description
1 GND Ground (power supply) 2 Vcc 3.0 – 3.6 VDC (power supply) 3 Vbak Back-up pin of module for “supercap” or battery (see below) 4 1PPS 1PPS (pulse per second) output 5 RX1 Serial input 1 – reserved for binary in (leave open) 6 TX1 Serial output 1 – reserved for binary out (leave open) 7 TX0
Serial output 0, NMEA out
8 RX0 Serial input 0, NMEA in
9 nRST Reset input 10 Res. Reserved – leave open 11 BOOTSEL Special boot mode – leave open for normal operation 12 Res. Reserved – leave open 13 Res. Reserved – leave open 14 Res. Reserved – leave open 15 Res. Reserved – leave open 16 Res. Reserved – leave open 17 Res. Reserved – leave open 18 GNDANT Antenna Ground, do not connect to GROUND, connect to
antenna shield (see below) 19 ANT Antenna signal / Z=50 Ohm 20 GNDANT Antenna Ground, see above 21 Res. Reserved – leave open 22 VANT
Power supply antenna – provide according voltage
Table 4: Pin description A1080-A
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GPS receiver A1080-A
5.3 General Comments
The following comments should be considered for a design with and use of the module:
Standard configuration of serial port (standard GPS software): Serial 0 (NMEA) 4800 baud, 8 data bits, no parity, 1 stop bit, no flow control
Antenna (Antenna connected to Antenna Pin) Use ground pins (pin 18, pin 20) close to the antenna input for RF ground.
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GPS receiver A1080-A
6 Electrical Characteristics
6.1 Operating Conditions
Pin Description Min Typical Max
V
bak
1.8V 3.6V3
Standby Current
(4)
20µA
V
cc
3.0V 3.3V 3.6V
Peak Acquisition Current
(1)
52mA
Average Acquisition Current
(2)
36mA
2
Tracking Current
(3)
31mA
Table 5: A1080 electrical characteristics
(1) Peak acquisition current is characterized by millisecond bursts above average acquisition cur-
rent (2) Average current is typically only the first two seconds of TTFF (3) Tracking current typically includes tracking and the post acquisition portion of TTFF (4) During standby state: RTC block and core powered on and clock off.
6.2 Absolute maximum ratings
Symbol Parameter Min Max Unit
Vcc power supply -0.3 +3.6 V Vin voltage to any pin -0.3 +3.6 V Iov input current on any pin -10 10 mA Itdv absolute sum of all input currents during overload condition 200 mA Tst storage temperature -55 125 °C Vant antenna supply voltage 0 5.5 V Iant antenna supply current 0 50 mA
Table 6: Absolute maximum ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause per­manent damage to the device. This is a stress rating only. Functional operation of the device at these or any other conditions beyond those indicated in the opera­tional sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
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GPS receiver A1080-A
7 Mounting
This chapter covers the mounting of the A1080-A.
7.1 Proposed Footprint for Soldering
The following proposal of a footprint for soldering is assuming a stencil thickness of 150µm. ³ marks the center of the through holes.
Figure 8: Soldering footprint proposal A1080-A
Please note that copper and solder paste footprint are identical. The final footprint has to be evaluated and qualified by the manufacturer according to the specific processes.
7.2 Recommended Profile for Reflow Soldering
Typical values for reflow soldering of the module in convection or IR/convection ov­ens are as follows:
Peak temperature (RoHS compliant process)
245°C Average ramp up rate to Peak (183°C to Peak) 3°C / second max. Preheat temperature 125 (±25°C)
120 seconds max. Temperature maintained above 183°C
60 … 150 seconds Time within 5°C of actual peak temperature
10 … 20 seconds Ramp Down rate
6°C / second max. Time 25°C to peak temperature
6 minutes max.
Table 7: Reflow soldering profile A1080-A
As results of soldering may vary among different soldering systems and types of solder and depend on additional factors like density and types of components on board, the values above should be considered as a starting point for further optimi­zation.
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GPS receiver A1080-A
8 Use of Antenna
8.1 Connection of RF Signal
The ANT pin is used to connect the receiver with the GPS antenna. The design of the antenna connection has to be done strictly according to RF design rules. A 50Ω PCB strip line is required. The following drawings shall explain the guidelines. A major rule is to keep the strip line as short as possible. Additionally, antenna ground (GNDANT) should be routed to the ground plane of the PCB (the ground plane is on a lower PCB layer) by via as demonstrated in the drawing.
Figure 9: Antenna connector strip line A1080-A
In order to gain the impedance of 50Ω, the width of the strip line needs to be calcu­lated. It depends on the thickness or height of the PCB layer (both parameters are shown in following drawing). For the calculation, it is assumed that the PCB mate­rial is FR4.
Figure 10: Strip line parameters A1080-A
In this case, the width should be about 1.8 times the height of the PCB:
W = 1.8 x H
In the example, one would get a width of W = 1.8 x 0.8mm = 1.44mm.
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GPS receiver A1080-A
8.2 Active Antenna
General GPS active antenna specification:
Limitations:
Supply voltage according to voltage fed into VANT pin (5V max.)
Supply current 50mA (max.)
Recommendations:
Gain 20dB (should not exceed 35dB)
Noise figure 1.5dB
The recommendations apply to the majority of active antennas that can be found in the market. Anyhow, the quality of the GPS antenna chosen is of paramount impor­tance for the overall sensitivity of the GPS system.
The system design needs to reflect the supply voltage of the antenna. If the supply voltage is equal to Vcc, Vcc can be connected to VANT. If the antenna requires a different supply voltage, the antenna bias can be provided through the VANT pin.
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GPS receiver A1080-A
9 Quality and Reliability
9.1 Environmental Conditions
Operating temperature
-30 … +85°C
Operating humidity
Max. 85% r. H., non-condensing, at 85°C MSL JEDEC (Moisture Sensitivity Level)
3
Storage 6 months in original package.
Table 8: Environmental conditions
9.2 Product Qualification
Prior to product qualification the GPS receiver is preconditioned according to EIA/JEDEC standard JESD22-A113-B / Level 3.
Basic qualification tests:
MSL Classification according to J-STD-020C (MSL3 @ 245°C)
MSL Rework Compatibility according to J-STD-020C
Temperature Cycling –30°C … +85°C
Temperature Humidity Bias 70°C / 85% RH
High / Low Temperature Operating –30° / +85°C
High Temperature Operating Life +85°C
Vibration Variable Frequency
Mechanical Shock
Please contact Tyco Electronics for detailed information.
9.3 Production Test
Each module is electrically tested prior to packing and shipping to ensure state of the art GPS receiver performance and accuracy.
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GPS receiver A1080-A
10 Applications and Hints
10.1 Minimum Configuration
Please refer to chapter 3.1 Minimum Configuration for details. In addition, for opti­mized start-up behavior it is strongly recommended to add a battery back-up circuit (see chapter 3.4)!
10.2 Antenna Status Adaptation
This chapter shall give assistance in designing a circuit for detecting if an antenna is connected to the module. The information about the antenna status can be de­rived from the ANTSTAT signal generated by this circuit. The examples use values for components that roughly result in the following ANTSTAT output:
Logic low when: Iant < 9mA
Logic high when: 9mA > Iant < 16mA
Logic low when: Iant > 16mA
10.2.1 Antennas with Different Current Draw
The following circuit is a proposal on how you can feed an antenna with 3.3V and provide an output for the ANTSTAT pin. The value of the components may need an adaptation in the final application. For example, the input current of the chosen comperator goes into that equation. The thresholds defined in this circuit are quite close to the ones described above. Their value is determined by resistors R4, R5, and R3.
We strongly recommend simulating and testing your realized version before using it. In any case, it is the responsibility of the designer to test and verify the implemen­tation.
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GPS receiver A1080-A
Figure 11: Application note: Antenna sensor adaptation
10.2.2 Antennas with Different Current Draw incl. Current Limiter
This proposal is similar to the first one, but includes a current limiter. Comments and notes as above apply.
We strongly recommend simulating and testing your realized version before use. In any case it is the responsibility of the designer to test and verify the implementation.
Figure 12: Application note: Antenna sensor adaptation with current limiter
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GPS receiver A1080-A
10.3 VANT Pin (antenna voltage input pin)
The VANT pin is an input pin.
The supply voltage for an active GPS antenna has to be fed into the Vant pin. The easiest way to do that is to connect Vcc to VANT. The maximum current is 50mA.
Note: Shortcut between ANT and GND may damage the A1080-A GPS receiver
module. This should be avoided by using an antenna current limiter.
Please find proposal for simple current limiter below. If other transistors are used, other resistor values may be necessary as well. We strongly recommend simulating and testing your realized version before using it.
The little schematics below work for Vcc from 3V to 5V. The antenna current will be limited to around 50mA.
Figure 13: Application note: Antenna current limiter
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GPS receiver A1080-A
10.4 1PPS pin (1 pulse per second pin)
The 1PPS pin is an output pin.
In addition to precise positioning, GPS also allows for accurate timing due to the synchronized atomic clocks in the GPS satellites. While the current date and time is transmitted in NMEA sentences, an exact and accurate timing signal is provided via the 1PPS pin of the A1080 modules.
10.5 Reset Signal
The nRST pin is an input pin.
The nRST pin can be used to generate a reset on the A1080-A module. Resetting the module will result in a restart of the complete firmware. All information stored in SRAM will still be valid.
10.5.1 Reset Sources
10.5.1.1 Internal reset circuit
The A1080 is already equipped with a voltage monitoring device that generates a proper power-on reset at the appropriate threshold and delay. Additionally it takes care about the brown-out protection. Usually there is no need to deal with the reset input externally, thus the general advice is to leave this pin open.
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GPS receiver A1080-A
10.5.1.2 External reset circuit
If – for some reasons – an external reset input is really desired, the use is subject to following restrictions:
(1) Never ever connect a capacitor of any size to the nRESET pin. (2) Never ever pull the nRESET pin actively high. (3) Only use an open drain/collector device (e.g. a bipolar NPN transistor to
ground, see Fig. 1) to pull the nRESET pin low in order to issue a reset.
(4) Make sure that the nRESET pulse is absolutely glitch free with sharp edges
and lasts at least 100ms.
Figure 14: Application note: External reset circuit
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GPS receiver A1080-A
10.6 Battery Back-up
This application note describes on how to back-up the RTC and the SRAM of the GPS receiver module. The basic of the first examples is to provide a back-up by a separate battery or a “supercap”.
While the “supercap” is charged thru the module during normal operation, the bat­tery (primary cell) is decoupled thru a diode!
Figure 15: Application note: Module back-up
An alternative to this solution is to switch the supply voltage from the Vcc pin to the Vbak pin. Care needs to be taken that the there is no voltage outage during the switch-over phase!
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GPS receiver A1080-A
11 Demonstration Kits
11.1 Evaluation Kit A1080-A
For demonstration and easy evaluation of GPS performance Tyco Electronics offers a Demonstration Kit (including one GPS A1080-A module). It contains a USB inter­face with according drivers to connect easily to a PC. The USB interface is an ex­tension of the serial port 0, therefore sending NMEA sentences and accepting commands. At the same time it provides power to the module. Accompanied by an antenna it offers a ready-to-go set. For the development of new software and applications the Evaluation Kit also pro­vides NMEA messages on C-MOS level via a terminal plug.
For further information please contact Tyco Electronics.
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GPS receiver A1080-A
12 Related Information
12.1 Contact
This manual was created with due diligence. We hope that it will be helpful to the user to get the most out of the GPS module.
Anyway, inputs about errors or mistakable verbalizations and comments or propos­als to TYCO Electronics, Power Systems in Munich, Germany, for further improve­ments are highly appreciated.
Hans Wiedemann Product Marketing Manager Positioning Products Tel.: +49 89 6089 838 Fax: +49 89 6089 835
Tyco Electronics Corporation Power Systems Finsinger Feld 1 85521 Ottobrunn, Germany
Email to gps@tycoelectronics.com.
Please visit our website at www.tycoelectronics.com/gps.
12.2 Related Documents
Manual: T.E. GPS Firmware A1080-A (TYCO)
Manual: T.E. GPS EvaluationKit EVA1080-A (TYCO)
Application note: GPS AN A1080-A – EDLC as Backup Supply V1.0
Application note: GPS AN A1080-A – Backup V1.0
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GPS receiver A1080-A
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GPS receiver A1080-A
13 List of Tables
Table 1: A1080 GPS characteristics ........................................................................ 8
Table 2: A1080-A dimensions and weight................................................................ 8
Table 3: Additional equipment................................................................................ 10
Table 4: Pin description A1080-A........................................................................... 15
Table 5: A1080 electrical characteristics................................................................ 17
Table 6: Absolute maximum ratings....................................................................... 17
Table 7: Reflow soldering profile A1080-A ............................................................. 18
Table 8: Environmental conditions ......................................................................... 21
14 List of Figures
Figure 1: A1080-A label ........................................................................................... 7
Figure 2: A1080-A tape specifications (1) ................................................................ 9
Figure 3: A1080-A tape specifications (2) .............................................................. 10
Figure 4: Recommended minimum configuration A1080-A.................................... 11
Figure 5: Mechanical outline component side A1080-A ......................................... 13
Figure 6: Mechanical outline solder side A1080-A ................................................. 14
Figure 7: Pin-out information A1080-A ................................................................... 15
Figure 8: Soldering footprint proposal A1080-A ..................................................... 18
Figure 9: Antenna connector strip line A1080-A..................................................... 19
Figure 10: Strip line parameters A1080-A .............................................................. 19
Figure 11: Application note: Antenna sensor adaptation........................................ 23
Figure 12: Application note: Antenna sensor adaptation with current limiter.......... 23
Figure 13: Application note: Antenna current limiter .............................................. 24
Figure 14: Application note: External reset circuit .................................................. 26
Figure 15: Application note: Module back-up ......................................................... 27
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