The RTC EEPROM Module DS3231 is a high accuracy real-time clock with battery backup, 4k x 8-bit EEPROM and I2C interface.
Features:
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Highly accurate timekeeping with temperature compensation
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Provides seconds / minutes / hours / date / day of week and year with leap-year compensation
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12 / 24 hour formats
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Two programmable time-of-day alarms
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Programmable square wave output
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Digital temperature sensor
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AT24C32 4K x 8-bit EEPROM non-volatile memory
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CR2032 battery backup (included)
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I2C interface
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Power LED
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3.3 and 5V compatible
Packing Includes:
1 X RTC EEPROM Module DS3231
Note: Battery is not included with the package. You have to buy it seperately from here.
Lithium Battery CR2025 (Japan)
Lithium Battery CR2025