User's Manual
Table Of Contents
- Contents
- Table Index
- Figure Index
- 1Introduction
- 1.1Product Outline
- 1.2Hardware Interface Overview
- 1.3Hardware Block Diagram
- 1.4Functional Overview
- 2Package Information
- 2.1.Pin Assignment Overview
- 2.2.Pin Description
- 2.3.Mechanical Information
- 2.4.Footprint Recommendation
- 3Interface Application
- 3.1Power Supply
- 3.3UART Interface
- 3.4USB Interface
- 3.5SIM Interface
- 3.6PCM Interface
- 3.7I2C Interface
- 3.8SPI Interface
- 3.9Network status
- 3.10ADC interface
- 3.11LDO output
- 3.12USB_BOOT Interface
- 3.13GPIO Interface
- 3.14 RF control Interface
- 3.15Force USB Download Interface
- 4RF Specifications
- 4.1LTE RF Specifications
- 4.2LTE Antenna Design Guide
- 4.3GNSS
- 4.4RF traces note
- 5 Electrical Specifications
- 5.1Absolute maximum ratings
- 5.2Operating conditions
- 5.3Operating Mode
- 5.4Current Consumption
- 5.5ESD Notes
- 6 SMT Production Guide
- 6.1Top and Bottom View of SIM7090G
- 6.2Label Information
- 6.3Typical SMT Reflow Profile
- 6.5Baking
- 6.6Stencil Foil Design Recommendation
- 7 Packaging
- 7.1Tray packaging
- 8 Appendix
- 8.1Coding Schemes and Maximum Net Data Rates over Air
- 8.2Related Documents
- 8.3Terms and Abbreviations
- 8.4Safety Caution
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4.3.2. GNSS Application Guide
Users can adopt an active antenna or a passive antenna to SIM7090G. The following figures are the
reference circuits.
Figure 26: Active antenna circuit
Figure 27: Passive antenna circuit (Default)
In the above figures, components C1, L1 and L2 are used for antenna matching. Usually, the value of the
component can only be obtained after the antenna is tuned, and is usually provided by the antenna supplier.
C2 is used for DC blocking. The active antenna's VDD requires an external power supply and should be
considered according to the characteristics of the active antenna. It is recommended to use LDO/DCDC to
turn off the active antenna when GNSS is not working to reduce current consumption.
GNSS can be tested through the NMEA port. NMEA sentences can be obtained automatically via UART or
USB. NMEA sentences include GSV, GGA, RMC, GSA and VTG. Before using GNSS, users should
configure SIM7090G to the correct working mode through AT commands. For more information, please
refer to the relevant documentation. SIM7090G can also obtain location information directly through AT.