I2C SD2405 RTC Module Interrupt

Hi,

I'm trying to setup the countdown timer of the SD2405 RTC Gravity module to generate interrupts. I followed the instructions of the datasheet to set it up, but no interrupt is generated. Moreover, I checked the register corresponding to the countdown interrupt flag (INTDF), but it remains at 0.
I think that I forgot something in the register configuration.
Do you have an example code that I could use to configure it ?

Thanks in advance,

Alex