ME310G1 Hardware Design Guide
1VV0301588 Rev. 16
Page 57 of 95
2021-10-27
Not Subject to NDA
8
GNSS SECTION
The ME310G1 module includes a state-of-the-art receiver capable of simultaneously
searching and tracking satellite signals from multiple satellite constellations. This multi-
GNSS receiver uses the entire spectrum of available GNSS systems, such as GPS,
GLONASS, BeiDou, Galileo, and QZSS.
8.1
GNSS Signals Pin-out
Table 38: GNSS Signals Pin-out
Warning: GNSS_1PPS is not currently supported by software and it
will be implemented in future SW releases.
8.2
RF Front End Design
The ME310G1 module does not contain the LNA required to achieve maximum sensitivity.
The active antenna (antenna with a built-in low noise amplifier) must be supplied with a
proper bias-tee circuit.
8.2.1
PCB Guidelines for GNSS Antenna
•
Make sure the antenna line impedance is 50ohm.
•
The antenna line on the PCB should be as short as possible to reduce the loss.
•
The antenna line must have uniform characteristics, constant cross-section
without meanders, or sharp curves.
•
If possible, keep one layer of the PCB used only for the Ground plane.
•
Wind (on both sides, above and below) the antenna line on the PCB with the Ground
plane, make sure the other signal tracks are not directly facing the antenna line.
•
The ground around the antenna line on the PCB must be firmly connected to the
Ground plane by placing vias at a minimal of each 2mm.
•
Place EM noisy devices as far as possible away from the antenna line.
Pin
Signal
I/O
Function
Type
E19
ANT_GNSS
I
GNSS Antenna (50 ohm)
H18
GNSS_LNA_EN
O
GNSS External LNA Enable
CMOS 1.8V
G16
GNSS_1PPS
O
1 Pulse per Second
CMOS 1.8V