Created Friday 27 January 2017
Extremely Accurate I²C-Integrated RTC/TCXO/Crystal
The DS3231 is a real-time clock (RTC), with an integrated temperature compensated crystal oscillator and crystal.
The DS3231 has a fixed I2C address of 0x68, and contains 19 indexed registers.
The first 7 registers are for time and date keeping, followed by 7 registers for two alarms, 3 registers for status and control of the chip, and 2 registers for temperature.
It's the continous monitoring of temperature that allows this chip to be exceedingly accurate.
It compensates its oscillator circuit based on the current temperature.
DS3231 - Maxim Integrated