User Guide

ME910G1 HW Design Guide
1VV0301593 Rev.7 Page 64 of 98 2021-02-02
8. GNSS SECTION
The ME910G1 module includes a state-of-art receiver that can simultaneously search
and track satellite signals from multiple satellite constellations. This multi-GNSS
receiver uses the entire spectrum of GNSS systems available: GPS, GLONASS, BeiDou,
Galileo, and QZSS.
GNSS Signals Pin-out
Table 29: GNSS Signals Pin-out
Warning: GNSS_1PPS is not currently supported by software and it will
be implemented in future SW releases.
RF Front End Design
The ME910G1 Module contains a pre-select SAW filter but does not contain the LNA necessary to
achieve the maximum sensitivity. Active antenna (antenna with a built-in low noise amplifier)
must be used and must be supplied with a proper bias-tee circuit.
Guidelines of PCB line for GNSS Antenna
• Make sure that the antenna line impedance is 50ohm.
• Keep the antenna line on the PCB as short as possible to reduce the loss.
• The Antenna line must have uniform characteristics, constant cross section, avoid
meanders and abrupt curves.
• If possible, keep one layer of the PCB used only for the Ground plane.
• Surround (on both the sides, above and below) the antenna line on PCB with
Ground, avoid having other signal tracks facing directly the antenna line of track.
• The ground around the antenna line on PCB must be strictly connected to the
Ground Plane by placing vias once per 2mm at least.
• Place EM noisy devices as far as possible from antenna line.
• Keep the antenna line far away from power supply lines.
Pin
Signal
I/O
Function
Type
R9
ANT_GNSS
I
GNSS Antenna (50 ohm)
R7
GNSS_LNA_EN
O
GNSS External LNA Enable
CMOS 1.8V