04-20-2021, 05:48 PM
(This post was last modified: 04-20-2021, 05:51 PM by dsimic.
Edit Reason: Wording cleanups
)
If you don't need the actual RTC backup functionality and you want to avoid applying hardware modifications to your Clusterboard, you could connect an external regulated 3.3 V DC power supply to the two pins of the battery holder, with a mandatory Schottky diode "inside" the "+" wire that connects the "+" of the external power supply to the "+" pin of the battery holder. The purpose of the additional diode is to ensure that no current will flow from the PMICs on the SOPine modules into the external power supply, which would be really bad.
Even in this case, you'd need to solder two wires to the battery holder pins, or to somehow affix the wires reliably to the battery terminals inside the battery holder.
Even in this case, you'd need to solder two wires to the battery holder pins, or to somehow affix the wires reliably to the battery terminals inside the battery holder.