GNSS Module Series
LC79D Hardware Design
LC79D_Hardware_Design 19 / 42
The construction of the module’s internal power system is illustrated as below.
VCC(1.7~1.9V)
LNAs PMU
CPU RTC logic Flash
VCC_RF
LC79D (A) only
Figure 4: Internal Power System Construction
3.4. Operation Modes
3.4.1. Full on Mode
Full on mode comprises tracking mode and acquisition mode. In acquisition mode, the module starts to
search satellites, and to determine the visible satellites, coarse carrier frequency as well as code phase of
satellite signals. When the acquisition is completed, it will automatically switch to tracking mode. In tracking
mode, the module tracks satellites and demodulates the navigation data from specific satellites.
When the module is powered on, it will enter full on mode automatically and follow the default
configurations as below.
Table 7: Default Configurations
GGA, RMC, GSA and GSV are the output types of NMEA messages supported by LC79D:
GGA: Global Positioning System Fix Data
RMC: Recommended Minimum Specific GNSS Data
GGA, RMC, GSA, GSV, GLL and VTG
GPS+BeiDou+GLONASS
+Galileo+QZSS+IRNSS
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