GMM-U1 Datasheet, PDF (3/36 Pages) List of Unclassifed Manufacturers – GPS Module

GlobalTop Technology
Gmm-u1 Data Sheet
3 _{Ver. V0G}
Table of Contents
1. Functional Description ........................................................................................................... 4
1.1 Overview.......................................................................................................................4
1.2 Highlights and Features ................................................................................................5
1.3 System Block Diagram...................................................................................................6
2. Specifications ........................................................................................................................ 7
2.1 Mechanical Dimension .................................................................................................7
2.2 Recommended PCB pad Layout....................................................................................8
2.3 Pin Configuration ..........................................................................................................9
2.4 Pin Assignment ...........................................................................................................10
2.5 Description of I/O Pin .................................................................................................11
2.6 Specification List .........................................................................................................14
2.7 Absolute Maximum Ratings........................................................................................15
2.8 Operating Conditions..................................................................................................15
2.9 GPS External Antenna Specification (Recommended) ...............................................16
3. Protocols ..............................................................................................................................17
3.1 NMEA Output Sentences ............................................................................................17
3.2 MTK NMEA Command Protocols................................................................................22
3.3 Firmware Customization Services...............................................................................23
4. Reference Design ..................................................................................................................24
4.1 Reference Design Circuit.............................................................................................24
5. Packing and Handling............................................................................................................26
5.1 Moisture Sensitivity ....................................................................................................26
5.2 Packing........................................................................................................................27
5.3 Storage and Floor Life Guideline.................................................................................29
5.4 Drying..........................................................................................................................29
5.5 ESD Handling...............................................................................................................30
6. Reflow Soldering Temperature Profile ...................................................................................31
6.1 SMT Reflow Soldering Temperature Profile................................................................31
6.2 Cautions on Reflow Soldering Process........................................................................32
6.3 Manual Soldering........................................................................................................35
7. Contact Information..............................................................................................................36
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