Specification: DS3231 is a low-cost, extremely accurate I2C real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, disconnect the main power supply and maintains accurate timekeeping. Integrated oscillator improves the long-term accuracy of the device and reduces the number of components
This is the DS1307 Real Time Clock The module comes fully assembled The DS1307 is accessed via the I2C protocol. Two wire I2C interface. Hour: Minutes: Seconds AM/PM. Day Month, Date – Year. DS1307 based RTC without LIR2032 battery 1Hz output pin. 56 Bytes of Non-volatile memory available to the