An rtc module keeps real date and time through power loss with battery backup. The main differences are interface, voltage fit, and drift tolerance, not just the chip name. DS3231 is the accuracy-first option at ±2 ppm, about 1 minute per year; DS1307 is the budget family but commonly drifts 20–60 seconds per month; DS1302 is not I2C and uses a 3-wire interface.
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