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10.6 Battery Back-up
This section describes how to back-up the RTC and the SRAM of the
GPS/GLONASS receiver module. The basics of the first example addresses
providing a back-up power supply by using a separate battery or a "Super cap".
While the "Super cap" is charged through the module during normal operation, the
battery (primary cell) is decoupled thru a diode!
Figure 16: Application note: Module back-up
An alternative to this solution is to switch the supply voltage from the Vcc pin to the
Vbak pin. Care needs to be taken that there is no voltage outage during the
switch-over phase!
V1.0-Mar-14
User's Manual
Page 35 of 43
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