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Maestro A1084 User Manual

Summary of A1084

  • Page 1

    Gps receivers a1084 a description of maestro’s gps receiver modules a1084-a/-b user’s manual version 1.4.

  • Page 2: Revision History

    V1.4 – mar-11 user’s manual page 2 of 39 revision history rev. Date description 1.0 01-26-09 first release 1.1 06-30-09 clear differentiation between a and b; extended note on definition of tracking sensitivity; corrected soldering profile; extended temperature range specification with slightly decr...

  • Page 3: Disclaimer

    V1.4 – mar-11 user’s manual page 3 of 39 disclaimer this document contains proprietary information of maestro wireless solutions limited. 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 maestro or its authorized...

  • Page 4: Table of Contents

    V1.4 – mar-11 user’s manual page 4 of 39 table of contents 1 introduction ........................................................................................................ 6 1.1 label ................................................................................................................

  • Page 5

    V1.4 – mar-11 user’s manual page 5 of 39 9 quality and reliability...................................................................................... 30 9.1 environmental conditions ............................................................................... 30 9.2 product qualification .........

  • Page 6: 1 Introduction

    V1.4 – mar-11 user’s manual page 6 of 39 1 introduction maestro’s gps modules a1084-a and a1084-b are highly integrated gps receiver modules that can be used as smt components. They are capable of receiving sig- nals from up to 20 gps satellites and transferring them into position and timing in- for...

  • Page 7

    V1.4 – mar-11 user’s manual page 7 of 39 1.1 label the a1084-a label (size: 9.5 x 9.5 mm²) contains the following information: figure 1: a1084-a label the label is placed on the shield of the module. The data matrix code holds the product type, software version, software release, hardware release, f...

  • Page 8

    V1.4 – mar-11 user’s manual page 8 of 39 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 (= 1,575 mhz) tracking sensitivity (1) -159 dbm position accuracy stand alone horizon...

  • Page 9: 2 Ordering Information

    V1.4 – mar-11 user’s manual page 9 of 39 2 ordering information 2.1 gps receivers a1084 the order number is built as follows: • a1084-axxx • a1084-bxxx a1084-a for the a1084-a module, a1084-b for the a1084-b module. The “xxx” refers to the current firmware version on the module. If no firmware versi...

  • Page 10

    V1.4 – mar-11 user’s manual page 10 of 39 figure 3: a1084 tape specifications (2) figure 4: a1084 tape specifications (3) one complete reel holds 900 a1084 modules. One box holds three reels, so a total of 2700 a1084 modules..

  • Page 11

    V1.4 – mar-11 user’s manual page 11 of 39 2.3 additional equipment eva1084a evaluation kit (including one module a1084a) table 4: additional equipment a detailed description of the eva1084-a evaluation kit can be found in the appro- priate manual. Note : there is no specific evaluation kit for the a...

  • Page 12: 3 Quick Start

    V1.4 – mar-11 user’s manual page 12 of 39 3 quick start in order to allow an easy and quick start with the a1084-a and a1084-b modules, this chapter provides a short overview on the important steps to be taken to receive nmea messages with position information on a serial port. Furthermore this mini...

  • Page 13

    V1.4 – mar-11 user’s manual page 13 of 39 a1084-a gsc3f/lpx serial vbak tx rx gnd 3.3v a b vbak gnd vbak gnd s upe rc ap ba tt er y c 6 + + back-up supply options (a) supercap, charged through gps module (b) primary cell, decoupled with diode nsr0310 ant_ext ant_gnd vant ant_sw* vcc * ant_sw on high...

  • Page 14

    V1.4 – mar-11 user’s manual page 14 of 39 for completeness the following pictures show the use of an rs232 level shifter. Gnd 1 2 3 4 5 6 7 8 9 c1 0.1µ f c2 0.1µ f c3 0.1µ f c4 0.1µ f c5 0.1µ f rs232 level shifter rs232 out db 9 f em al e 3.3v vcc gnd t1o r1i r1o t1i t2i r2o c1+ v+ c1- c2+ c2- v- t2...

  • Page 15

    V1.4 – mar-11 user’s manual page 15 of 39 3.2 antennas generally, the quality of the gps antenna chosen (passive or active) is of paramount importance for the overall sensitivity of the gps system. Losses through a bad an- tenna, long cables or tracks or a bad antenna position can’t be compensated a...

  • Page 16: 4 Mechanical Outline

    V1.4 – mar-11 user’s manual page 16 of 39 4 mechanical outline 4.1 details component side a1084 all dimensions in [mm, (inch)] figure 8: mechanical outline component side a1084-a/-b.

  • Page 17

    V1.4 – mar-11 user’s manual page 17 of 39 4.2 details solder side a1084 solder pad size (outer pads): 1.0 x 0.8 solder pad size (inner pads): 1.5 x 1.5 all dimensions in [mm] figure 9: mechanical outline solder side a1084.

  • Page 18: 5 Pin-Out Information

    V1.4 – mar-11 user’s manual page 18 of 39 5 pin-out information 5.1 layout a1084 figure 10: pin-out information (bottom view) a1084 pin one marker.

  • Page 19

    V1.4 – mar-11 user’s manual page 19 of 39 5.2 description a1084 signals 5.2.1 description a1084-a signals pin symbol function description 1 nrst input reset input (open / high – no reset, low - reset); see “10.5 reset signal ” 2 bootsel input special boot mode – leave open for normal operation; (hig...

  • Page 20

    V1.4 – mar-11 user’s manual page 20 of 39 5.2.2 description a1084-b signals pin symbol function description 1 nrst input reset input (open / high – no reset, low - reset); see “10.5 reset signal ” 2 bootsel input special boot mode – leave open for normal operation; (high – boot loader active) 3 vcc ...

  • Page 21

    V1.4 – mar-11 user’s manual page 21 of 39 note (1): in the event that an active antenna is connected to pin 12, ant_int the antenna supply voltage has to be fed separately (see chapter “8.2.3 active antennas on ant_int”). Note (2): an active antenna connected to pin 12, ant_int must not exceed a gai...

  • Page 22: 6 Electrical Characteristics

    V1.4 – mar-11 user’s manual page 22 of 39 6 electrical characteristics 6.1 operating conditions pin description min typical max v bak 1.8v 3.6v 15 standby current (4) 20µa v cc 3.0v 3.3v 3.6v peak acquisition current (1) 35ma average acquisition current (2) 31ma 3 tracking current (3) 26ma table 7: ...

  • Page 23

    V1.4 – mar-11 user’s manual page 23 of 39 6.3 dc electrical characteristics symbol parameter min max unit 1pps, tx1, tx0,rfpwup, nwakeup, gpio 0 voh 2.6 vcc v vol 0.2 v rx1, rx0 vih 2.0 vcc v vil 0.8 v nrst for safe reset 0.2 v on_off vih 0.84 1.5 v vil -0.3 0.36 v bootsel vih 2.3 vcc v ant_sw vih 2...

  • Page 24: 7 Mounting

    V1.4 – mar-11 user’s manual page 24 of 39 7 mounting this chapter describes the suggested mounting process for the a1084-a and a1084-b receiver modules. In a rohs compliant product with a rohs compliant process it is recommended to use chemical tin as the counter-part to the module’s pins. This will...

  • Page 25: 8 Use of Gps Antennas

    V1.4 – mar-11 user’s manual page 25 of 39 8 use of gps antennas 8.1 connecting a gps antenna to the gps receiver the ant_ext or ant_int pin is used to connect a gps antenna to the receiver. The design of the antenna connection has to be done strictly according to rf design rules. A 50 Ω pcb strip li...

  • Page 26

    V1.4 – mar-11 user’s manual page 26 of 39 in order to achieve the impedance of 50 Ω , 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 ...

  • Page 27

    V1.4 – mar-11 user’s manual page 27 of 39 8.2 antenna connections 8.2.1 active antennas 8.2.1.1 on external / active antenna input (ant_ext) general gps active antenna specification: limitations: • supply voltage (voltage fed into vant pin) 5v (max.) • supply current 50ma (max.) recommendations: • g...

  • Page 28

    V1.4 – mar-11 user’s manual page 28 of 39 8.2.1.2 on internal / passive antenna input (ant_int) this schematic is a part of the eva1084-a (evaluation kit) schematics. It shows how an antenna supply voltage can be fed to an active antenna connected to ant_int and how the antenna supply voltage can be...

  • Page 29

    V1.4 – mar-11 user’s manual page 29 of 39 8.2.2 passive antennas a passive antenna connected to ant_int should be placed as close as possible to the gps receiver. The signal power lost by the antenna cable or lost by the strip line on the pcb can not be recovered by the lna (low noise amplifier) int...

  • Page 30: 9 Quality and Reliability

    V1.4 – mar-11 user’s manual page 30 of 39 9 quality and reliability 9.1 environmental conditions operating temperature -40°c … +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 6: environmental con...

  • Page 31: 10 Applications and Hints

    V1.4 – mar-11 user’s manual page 31 of 39 10 applications and hints 10.1 minimum configuration please refer to chapter “3.1 minimum configuration” for details. In addition, for op- timized start-up behavior it is strongly recommended to continuously supply vcc and use on_off pin to go to hibernate m...

  • Page 32

    V1.4 – mar-11 user’s manual page 32 of 39 figure 15: application note: antenna sensor adaptation 10.2.2 antenna sensor with 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 the g...

  • Page 33

    V1.4 – mar-11 user’s manual page 33 of 39 10.3 vant pin (antenna voltage input pin) the vant pin is an input pin. The supply voltage for an active gps antenna on the ant_ext input has to be fed into the vant pin. The easiest way to do that is to connect vcc to vant. The maxi- mum current is 50 ma. N...

  • Page 34

    V1.4 – mar-11 user’s manual page 34 of 39 10.5 reset signal the nrst pin is an input pin. The nrst pin can be used to generate a reset on the a1084-a/-b 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 internal...

  • Page 35

    V1.4 – mar-11 user’s manual page 35 of 39 10.6 battery back-up this application note describes how to back-up the rtc and the sram of the gps receiver module. The basics of the first example addresses providing a back-up power supply by using a separate battery or a “supercap”. While the “supercap” ...

  • Page 36

    V1.4 – mar-11 user’s manual page 36 of 39 10.7 push-to-fix mode push-to-fix mode is designed for the application that requires infrequent position reporting. The receiver generally stays in a low-power mode, up to 2 hours, but wakes up periodically to refresh position, time, ephemeris data and rtc c...

  • Page 37: 11 Evaluation Kit Eva1084-A

    V1.4 – mar-11 user’s manual page 37 of 39 11 evaluation kit eva1084-a for demonstration and easy evaluation of gps performance maestro offers an evaluation kit (including one gps a1084-a module). It contains a usb interface with according drivers to connect easily to a pc. The usb interface is an ex...

  • Page 38: 12 Related Information

    V1.4 – mar-11 user’s manual page 38 of 39 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. Inputs regarding errors or mistaken verbalizations and comments or proposals to maestro, hongko...

  • Page 39

    V1.4 – mar-11 user’s manual page 39 of 39 13 list of figures figure 1: a1084-a label ........................................................................................... 7 figure 2: a1084 tape specifications (1).................................................................... 9 figure 3: a...