Maestro A2200-A Bedienungsanleitung PDF herunterladen (Seite 35)

V1.0-Mar-14

User’s Manual

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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!

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Maestro A2200-A Bedienungsanleitung Seite 35