RX8901CE

Built in frequency adjusted 32.768 kHz crystal unit and DTCXO.
Interface Type : I²C-Bus interface
Low backup current : 240 nA Typ. / 3 V
Auto power switching function : Automatically switches to backup power supply by monitoring the VDD voltage
Time stamp function : 32 times max. stamped from year to 1/1024 seconds.
Time update interruption : Hourly, minutely, and secondly
Alarm interruption in Day, date, hour, minute, second
Auto repeat wakeup timer interruption
Self-monitoring interruption : Crystal oscillation stop. V_BAT low, V_DD low.