SMARC T335x Carrier Board Hardware Design Guide, Document Revision 1.2
3.2.2. RTC Battery Lifetime
The RTC battery lifetime determines the time interval between system
battery replacement cycles. Current leakage from the RTC battery circuitry
on the carrier board is a serious issue and must be considered during the
system design phase. The current leakage will influence the RTC battery
lifetime and must be factored in when a specific life expectancy of the
system battery is being defined.
In order to accurately measure the value of the RTC current it should be
measured when the complete system is disconnected from AC power.
3.3 Power Flow and Control Signals Block Diagram
Following figures shows the power flow and control signals block diagram.
Figure 38: Power Block Diagram
