Features 1 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 improve long term accuracy of the device and reduces the number of components of the production line the ds3231 is available in commercial and industrial temperature ranges using a 16 pin 300mil so package 2 rtc maintains seconds minutes hours day date month and year information less than 31 days of the month the end date will be automatically adjusted including corrections for leap year the clock operates in either the 24 hours or band am pm indication of the 12 hour format provides two configurable alarm clock and a calendar can be set to a square wove output address and data are transferred serially through an i2c bidirectional bus 3 a precision temperature compensated voltage reference and comparator circuit monitors the status of vcc to detect power failures provide a reset output and if necessary automatically switch to the backup power supply in addition rst pin is monitored as generating p reset manually 4 save time and high precision addition ds3231 also has some other features that extend the system host of additional features and a range of options the device integrates a very precise digital temperature sensor through the i2c interface to ac
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