When 3.3V_EN is disabled on a carrier board, won't this cause the RTC battery to attempt to backfeed any devices on 3.3V rail (including devices on the carrier board 3.3V)?
The MicroMod specs for RTC_3V say:
3V provided by external coin cell or mini battery. Max draw=100μA. Connect to pins maintaining an RTC during power loss. Can be left NC.The 3V3_LED on the carrier board by itself will exceed 100μA at 3V. Doesn't this violate the above spec for RTC_3V?