Quectel LC79D

GNSS Module Series
LC79D Hardware Design
LC79D_Hardware_Design 3 / 42
Contents
About the Document .................................................................................................................................. 2
Contents ...................................................................................................................................................... 3
Table Index .................................................................................................................................................. 5
Figure Index ................................................................................................................................................ 6
1 Introduction ......................................................................................................................................... 7
1.1. Safety Information ...................................................................................................................... 7
2 Product Concept ................................................................................................................................. 8
2.1. General Description ................................................................................................................... 8
2.2. Product Variants ......................................................................................................................... 9
2.2.1. UDR Technology ............................................................................................................. 9
2.3. Key Features ............................................................................................................................ 10
2.4. Block Diagram .......................................................................................................................... 11
2.5. Evaluation Board ...................................................................................................................... 12
2.6. Supported Protocols ................................................................................................................ 12
3 Application Interfaces ...................................................................................................................... 14
3.1. Pin Assignment ........................................................................................................................ 14
3.2. Pin Description ......................................................................................................................... 15
3.3. Power Supply ........................................................................................................................... 18
3.4. Operation Modes ...................................................................................................................... 19
3.4.1. Full on Mode.................................................................................................................. 19
3.4.2. Sleep Mode ................................................................................................................... 20
3.4.3. Standby Mode ............................................................................................................... 20
3.5. UART Interface ........................................................................................................................ 21
3.6. SPI Interface ............................................................................................................................ 22
3.7. I2C Interface* ........................................................................................................................... 23
3.8. Boot Interface ........................................................................................................................... 24
4 Antenna Interfaces ............................................................................................................................ 26
4.1. Antenna Specifications ............................................................................................................ 26
4.2. Recommended Antenna Reference Designs .......................................................................... 27
4.2.1. Antenna Selection Guide .............................................................................................. 27
4.2.1. Active Antenna Reference Design ................................................................................ 27
4.2.2. Passive Antenna Reference Design ............................................................................. 28
5 Electrical, Reliability and Radio Characteristics ........................................................................... 30
5.1. Absolute Maximum Ratings ..................................................................................................... 30
5.2. Operating Conditions ............................................................................................................... 31
5.3. Current Consumption ............................................................................................................... 31
5.4. ESD Protection ......................................................................................................................... 31
6 Mechanical Dimensions ................................................................................................................... 33