1. 1 Hz output pin SQW.
2. 32 KHz output pin 32K.
3. Voltage Supply: 2.2 V ~ 5.5 V (for RTC).
4. Time Format: HH: MM: SS (12/24 hr).
5. Date Format: YY-MM-DD-dd.
6. DS 3231 based RTC with 2032 Battery Holder.

DS3231 is a low-cost, extremely accurate I2C real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. Real time clock generator seconds, minutes, hours, day, date, month and year timing and provide valid until the year 2100 leap year compensation DS3231 available in commercial and industrial temperature ranges, using a 16-pin 300mil SO package.

1. Two Time-of-Day Alarms.
2. Digital Temp Sensor Output.
3. Register for Aging Trim.
4. DS 3231 RTC with 2032 Battery Holder.
5. Highly Accurate RTC Completely Manages All Timekeeping Functions.
6. Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year, with Leap-Year Compensation Valid Up to 2100.
7. Configurable I2C device Address for AT24C32 using SMD jumpers on PCB (A0, A1, A2).
8. Programmable Square-Wave Output Signal.
9. Battery-Backup Input for Continuous Timekeeping.
10. Low Power Operation Extends Battery-Backup Run Time.