Raspberry Pi RTC DS3231 clock module DS 3231

Specification Accuracy 2ppm from 0C to +40C Accuracy 3.5ppm from -40C to +85C Battery Backup Input for Continuous Timekeeping Operating Temperature Ranges - Commercial: 0C to +70C, Industrial: -40C to +85C Low-Power Consumption Real-Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to 2100 Two Time-of-Day Alarms Programmable Square-Wave Output Fast (400kHz) I2C Interface 3.3V Operation Digital Temp Sensor Output: 3C Accuracy Register for Aging Trim RST Output/Pushbutton Reset Debounce Input Underwriters Laboratories (UL) Recognized