I have a question about specifications. To have the DS3231 RTC in the lowest current consumption mode it must run on battery with its I2c inactive, see Maxim Integrated page 3 section VBAT Current Consumption. The definition of what an inactive I2C interface is is not clear specified in the specifications.
I use the chip as a watch dog to periodic power up a system using its Int/SQW open collector output activating a Pmosfet which acts as a switch to the system to be power up. In a power off mode the DS3231 I2C interfaces is unpowered and down/low including, the RTC chip receives only power using a battery. Is in this state, the I2C considered inactive and so the current consumption 2uA.?
Is the definition of an inactive I2c interface in this specification one with inactive not changing SCL and SDA pins independent of the voltage levels high or low at these pins, in my case active low because of the lac of VCC at the microcontroller.
Hope someone can clear this up.