GNSS Module Series
LC79D Hardware Design
LC79D_Hardware_Design 18 / 42
1. Please keep unused and RESERVED pins open.
2. “*” means under development.
3.3. Power Supply
VCC supplies power for BB, RF, flash and RTC domains. The load current of VCC varies according to the
VCC voltage level, processor load and satellite acquisition.
It is recommended to select an LDO with minimum output current of 100mA as the power supply, and add
a decoupling capacitor combination (10μF and 100nF) as well as a TVS near the VCC pin. It is strongly
discouraged to use a pulse frequency modulation regulator for power supply.
PMU
VCC
10μF
100nF
Module
TVS
ESD5651N
Figure 3: VCC Input Reference Circuit
ready for
communication
with the AP
when AP_REQ is
driven high.
Low level: the
module is in sleep
mode and is not
ready to
communicate with
the AP.
High level: the
module is awake and
ready to
communicate with
the AP.
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