characteristic

 Can measure seconds, minutes, hours, days of the week, days, months and years based on 32.768kHz crystal

 With century mark

Wide operating voltage range: 1.5～5.5V

 Low sleep current: typical value is 0.25μA (VDD=3.0V, TA=25℃)

 I2C bus slave address: read, 0A3H; write, 0A2H

 Programmable clock output frequency: 32.768kHz, 1024Hz, 32Hz, 1Hz

 Alarm and timer

 Power-off detector

 Internally integrated oscillation capacitor

 Packaging form: SOP8/MSOP8/TSSOP8

 Open-drain interrupt pin