ZED-F9R-Integration manual
• Ensure RF trace is tuned for 50 Ω to ensure adequate bandwidth and power matching.
4.9.5 Ground pads
Ensure the ground pads of the module are connected to ground.
4.9.6 Schematic design
For a minimal design with the ZED-F9R GNSS modules, consider the following functions and pins:
• Connect the power supply to VCC and V_BCKP.
• V_USB: If USB is used it is recommended V_USB is to be powered as per USB self-powered mode
specification.
• If USB is not used connect V_USB to ground.
• Ensure an optimal ground connection to all ground pins of the ZED-F9R GNSS module.
• Choose the required serial communication interfaces (UART, USB, SPI or I2C) and connect the
appropriate pins to your application.
• If you need hot or warm start in your application, connect a backup battery to V_BCKP.
4.9.7 Layout design-in guideline
• Is the receiver placed away from heat sources?
• Is the receiver placed away from air-cooling sources?
• Is the receiver shielded by a cover/case to prevent the effects of air currents and rapid
environmental temperature changes?
• Is the receiver placed as recommended in the Layout and Layout guidance?
• Assure a low serial resistance on the VCC power supply line (choose a line width > 400 um).
• Keep the power supply line as short as possible.
• Add a ground plane underneath the module to reduce interference. This is especially important
for the RF input line.
• For improved shielding, add as many vias as possible around the micro strip/co-planar
waveguide, around the serial communication lines, underneath the module, etc.
UBX-20039643 - R06
4 Design Page 104 of 119
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