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DS3231 Real-time clock module RTC
Highly Accurate RTC Completely Manages All Timekeeping Functions
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
Accuracy ±2ppm from 0°C to +40°C
Accuracy ±3.5ppm from -40°C to +85°C
Digital Temp Sensor Output: ±3°C Accuracy
Register for Aging Trim
RST Output/Pushbutton Reset Debounce Input
Two Time-of-Day Alarms
Programmable Square-Wave Output Signal
Simple Serial Interface Connects to Most Microcontrollers 2
Fast (400kHz) IC Interface
Battery-Backup Input for Continuous Timekeeping
Low Power Operation Extends Battery-Backup Run Time
3.3V Operation