The DS3231M is a low-cost, extremely accurate, I2C real-time clock (RTC). The device incorporates a battery input and maintains accurate timekeeping when main power to the device is interrupted. The integration of the microelectromechanical systems (MEMS) resonator enhances the long-term accuracy of the device and reduces the piece-part count in a manufacturing line. The DS3231M is available in the same footprint as the popular DS3231 RTC.

The RTC maintains seconds, minutes, hours, day, date, month, and year information. The date at the end of the
month is automatically adjusted for months with fewer than 31 days, including corrections for leap year.
The clock operates in either the 24-hour or 12-hour format with an AM/PM indicator. Two programmable time-ofday alarms and a 1Hz output are provided. Address and data are transferred serially through an I2C bidirectional bus. A precision temperature-compensated voltage reference and comparator circuit monitors the status of VCC to detect power failures, to provide a reset output, and to automatically switch to the backup supply when necessary. Additionally, the RST pin is monitored as a pushbutton input for generating a microprocessor reset. See the Block Diagram for more details.

Timekeeping Accuracy Q5ppm (Q0.432 Second/ Day) from -40NC to +85NC Battery Backup for Continuous Timekeeping Low Power Consumption Footprint and Functionally Compatible to DS3231 Complete Clock Calendar Functionality Including Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Up to Year2100 Two Time-of-Day Alarms 1Hz and 32.768kHz Outputs Reset Output and Pushbutton Input with Debounce Fast (400kHz) I2C-Compatible Serial Bus +2.3V to +5.5V Supply Voltage Digital Temp Sensor with Q3NC Accuracy -40NC to +85NC Temperature Range 8-Pin or 16-Pin SO (300 mils) Packages Underwriters Laboratories (UL) Recognized	Temperature operating range: -40°C to +125°C Package/case: 8-SOIC
Power Meters Industrial Applications