GPS receiver A1080-A
10.6 Battery Back-up
This application note describes on how to back-up the RTC and the SRAM of the
GPS receiver module. The basic of the first examples is to provide a back-up by a
separate battery or a “supercap”.
While the “supercap” is charged thru the module during normal operation, the bat-
tery (primary cell) is decoupled thru a diode!
Figure 15: 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 the there is no voltage outage during
the switch-over phase!
V2.3 - 07/07
User’s Manual
Page 27 of 31
