So the battery backup voltage does not go to module Vcc (doh) and so the internal 4.7K pull-up is acting as a pull-down when Vcc is unpowered and tied to ground. Have I got it right ?
If so then what use is the “battery backup mode that enables this output when an external source of power is not present, so that the module can still be used for timekeeping” ? If I had a relay to open Vcc from the RTC’s Vcc, would that work ? Or will the unpowered circuitry of the RTC pull Vcc to ground and give us the pull-down situation ? Is the only way that function is useful is to have a strong external pull-up, thus negating (somewhat) the low power advantage ?
THX for the info !