Related Manuals for Maestro A1084
Summary of Contents for Maestro 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
Hibernate Mode extended (use of ON_OFF pin or Shutdown Command) 12-22-09 Corrected Vcc connection in minimum configuration (wrong pin in 1.2) 02-09-11 New style; moved to Maestro mm-dd-yy V1.4 – Mar-11 User’s Manual Page 2 of 39... - Page 3 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 AGENTS. THE INFORMATION IN THIS DOCUMENT IS, TO THE BEST OF OUR KNOWLEDGE, ENTIRELY CORRECT.
-
Page 4: Table Of Contents
1.2.2 Mechanical Characteristics..................8 1.3 Handling Precautions ..................8 2 Ordering Information ..................9 2.1 GPS Receivers A1084 ..................9 2.2 Packing of the A1084 ..................9 2.3 Additional Equipment ..................11 3 Quick Start......................12 3.1 Minimum Configuration ................... 12 3.2 Antennas...................... - Page 5 9 Quality and Reliability..................30 9.1 Environmental Conditions ................30 9.2 Product Qualification ..................30 9.3 Production Test ....................30 10 Applications and Hints .................. 31 10.1 Minimum Configuration ................. 31 10.2 Antenna Status Adaptation ................31 10.2.1 Antenna Sensor...................... 31 10.2.2 Antenna Sensor with Current Limiter..............
-
Page 6: Introduction
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- formation that can be read over a serial port. -
Page 7: 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, factory code, year & week of assembly and a 6-digit serial number. The A1084-B’s labels show a “B” instead of the “A”. -
Page 8: Characteristics
A1084 Weight 1.2 g, 0.042 oz Table 3: A1084 dimensions and weight 1.3 Handling Precautions The GPS receiver modules A1084-A/-B are sensitive to electrostatic discharge (ESD). Please handle with appropriate care. V1.4 – Mar-11 User’s Manual Page 8 of 39... -
Page 9: Ordering Information
If no firmware version is referenced in an order, the latest version will be provided. 2.2 Packing of the A1084 The A1084-A/-B GPS modules come in a tape and reel package suitable for pick and place machines. Figure 2: A1084 tape specifications (1) V1.4 –... - Page 10 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. V1.4 – Mar-11 User’s Manual Page 10 of 39...
-
Page 11: 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 A1084-B, distinct from the evaluation kit for the A1084-A, as evaluation kits are designed for demonstration purposes and testing. -
Page 12: Quick Start
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- mum configuration takes best start-up behavior into account. - Page 13 Supercap, charged through GPS module Primary cell, decoupled with diode Primary cell, decoupled with diode Figure 6: Minimum configuration A1084-A with Vbak Remarks: • Use separate ground plane for antenna ground. • External antenna input impedance is 50 Ω. Match as close as possible.
- Page 14 For completeness the following pictures show the use of an RS232 level shifter. RS232 Level Shifter RS232 Level Shifter 3.3V 3.3V RS232 Out RS232 Out MAX3232 MAX3232 Figure 7: RS232 level shifter for minimum configurations Remarks: • Place C1 to C5 (here: 0.1µF) close to MAX3232. For capacity values see datasheet of actual component used.
-
Page 15: Antennas
3.2.2 Active Antennas The A1084-A supports active antennas directly, i.e. by offering an antenna voltage feed pin (VANT – pin 8) along with a signal path without LNA on the module (con- necting point is ANT_EXT – pin 9). If this connection is used, it is recommended to use an active antenna with a supply voltage of 3 to 5 VDC and a current draw of 50 mA maximum. -
Page 16: Mechanical Outline
4 Mechanical Outline 4.1 Details Component Side A1084 All dimensions in [mm, (inch)] Figure 8: Mechanical outline component side A1084-A/-B V1.4 – Mar-11 User’s Manual Page 16 of 39... -
Page 17: Details Solder Side A1084
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 V1.4 – Mar-11 User’s Manual Page 17 of 39... -
Page 18: Pin-Out Information
5 Pin-out Information 5.1 Layout A1084 Figure 10: Pin-out information (bottom view) A1084 pin one marker V1.4 – Mar-11 User’s Manual Page 18 of 39... -
Page 19: Description A1084 Signals
-leave open if not used Output Serial output 1 – unused in current firmware (leave open) Output Serial output 0, NMEA out Input Serial input 0, NMEA in Table 5: Pin description A1084-A V1.4 – Mar-11 User’s Manual Page 19 of 39... -
Page 20: Description A1084-B Signals
-leave open if not used Output Serial output 1 – unused in current firmware (leave open) Output Serial output 0, NMEA out Input Serial input 0, NMEA in Table 6: Pin description A1084-B V1.4 – Mar-11 User’s Manual Page 20 of 39... -
Page 21: General Comments
SIRF recommendation (see chapter “8.2.3 Active Antennas on ANT_INT”). 5.3 General Comments The following comments should be considered for a design using either the A1084-A or A1084-B 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 •... -
Page 22: Electrical Characteristics
31mA Tracking Current 26mA Table 7: A1084 electrical characteristics (1) Peak acquisition current is characterized by millisecond bursts above average acquisition current (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. -
Page 23: Dc Electrical Characteristics
6.3 DC Electrical Characteristics Symbol Parameter Max Unit 1PPS, TX1, TX0,RFPWUP, nWAKEUP, GPIO 0 RX1, RX0 nRST for safe reset ON_OFF 0.84 -0.3 0.36 BOOTSEL ANT_SW Table 9: DC electrical characteristic V1.4 – Mar-11 User’s Manual Page 23 of 39... -
Page 24: Mounting
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 guarantee highest resistance against shocks. -
Page 25: Use Of Gps Antennas
Top view ANT_EXT ANT_GND ANT_EXT ANT_GND GPS Receiver GPS Receiver 50Ωstrip line Vias to Top Layer Vias to GND Layer GPS receiver solder pads Figure 11: Antenna connector strip line A1084 V1.4 – Mar-11 User’s Manual Page 25 of 39... - Page 26 For the calculation, it is assumed that the PCB material is FR4. Figure 12: Strip line parameters A1084 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 0.8 mm = 1.44 mm.
-
Page 27: Antenna Connections
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: • Gain ≥ 20dB (should not exceed 26dB + cable loss) •... - Page 28 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 switched on and off by RFPWUP. Figure 13: Antenna supply voltage for ANT_INT and antenna supply switch An active antenna connected to pin 12, ANT_INT must not exceed a gain of 10dB + antenna cable loss according to SIRF recommendation.
-
Page 29: Passive Antennas
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) integrated in the GPS receiver. -
Page 30: Quality And Reliability
• High Temperature Operating Life +85°C • Vibration Variable Frequency • Mechanical Shock Please contact Maestro 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. -
Page 31: Applications And Hints
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 mode or to use the shutdown command and add a battery back-up circuit (see chapter “10.6 Battery Back-up”) when switching off Vcc. -
Page 32: Antenna Sensor With Current Limiter
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 GPS receiver integrated in your product design before implementing the finalized product in the appropriate market ap- plication. -
Page 33: Vant Pin (Antenna Voltage Input Pin)
Vant pin. The easiest way to do that is to connect Vcc to VANT. The maxi- mum current is 50 mA. Note: Shortcut between ANT and GND may damage the A1084-A/-B GPS receiver module. This should be avoided by using an antenna current limiter. -
Page 34: Reset Signal
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. -
Page 35: Battery Back-Up
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: Push-To-Fix Mode
From firmware version 3.2.5, firmware support for ON_OFF has been included, hence, a rising pulse on the ON_OFF pin will put the A1084 GPS receiver into hi- bernate state if it is on and wake it up if it is in sleep state. During sleep state the receiver draws 20 µA typically and maintains RTC and SRAM. -
Page 37: 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 extension of the serial port 0, therefore sending NMEA sentences and accepting commands. -
Page 38: Related Information
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, Hongkong, for further improvements are highly appreciated. Maestro Wireless Solutions Limited Add:Unit 3603-09,36/F.,... -
Page 39: List Of Figures
Figure 3: A1084 tape specifications (2)..............10 Figure 4: A1084 tape specifications (3)..............10 Figure 5: Minimum configuration A1084-A with continued Vcc supply ....12 Figure 6: Minimum configuration A1084-A with Vbak..........13 Figure 7: RS232 level shifter for minimum configurations ........14 Figure 8: Mechanical outline component side A1084-A/-B........