Smart Machine Smart Decision
SIM5360_Hardware Design_V1.06
2016-11-17
52
80
MODULE
79
GNSS_ANT
GND
78
GND
Matching circuit
GPS/GLONASS
antenna
L1
C1
VDD
10 ohm
C2
L2
47nH
33pF
Figure 37: Active antenna circuit
80
MODULE
79
GNSS_ANT
GND
78
GND
Matching circuit
GPS/GLONASS
antenna
L1
C1
L2
Figure 38
:
Passive antenna circuit (Default)
In above figures, the components C1 and L1, L2 are used for antenna matching, the values of the
components can only be obtained after the antenna tuning usually, and they are provided by antenna
vendor.C2 in Figure 36 is used for DC isolation. In active antenna circuit, users must use an external
LDO/DCDC to provide VDD voltage whose value should be taken according active antenna characteristic,
and VDD can be shut down to avoid consuming additional current when not being used.
GNSS can be used by NMEA port. User can select NMEA as output through UART or USB. NMEA
sentences are automatic and no command is provided. NMEA sentences include GSV, GGA, RMC, GSA,
and VTG. Before using GNSS, user should configure SIM5360 in proper operating mode by AT command.
Please refer to related document for details. SIM5360 can also get position location information through
AT directly.
Note:
GNSS is closed by default, it could be started by AT+CGPS. The AT command has two parameters,
the first is on/off, and the second is GNSS mode. Default mode is standalone mode.
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