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The DS3231 is a low-cost, extremely accurate I2C real time clock (RTC) with anintegrated temperature compensated crystal oscillator (TCXO) and crystal. Microprocessor interface is exclusively through an I2C bidirectional bus.

The device

• incorporates a battery input, and maintains accurate timekeeping when main power to the device is interrupted.
• maintains seconds, minutes, hours, day, date, month, and year information.
• automatically adjusts dates for months with fewer than 31 days, including corrections for leap year.
• operates in either the 24-hour or 12-hour format with an AM/PM indicator.
• includes two programmable time-of day alarms.
• has and frequency programmable square-wave output.

This library features access to all on-chip features

• Read and write clock time registers
• Read and write alarm registers and controls
• Read/write clock and alarm registers as RAM
• Control of square wave generator (on/off & frequency)
• Control of clock features (Square Wave type and on/off, 12/24H, day of week, etc)

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