General DescriptionThe DS3231 is a low-cost, extremely accurate I2C realtimeclock (RTC) with an integrated temperaturecompensatedcrystal oscillator (TCXO) and crystal. Thedevice incorporates a battery input, and maintains accuratetimekeeping when main power to the device is interrupted.The integration of the crystal resonator enhancesthe long-term accuracy of the device as well as reducesthe piece-part count in a manufacturing line. The DS3231is available in commercial and industrial temperatureranges, and is offered in a 16-pin, 300-mil SO package.The RTC maintains seconds, minutes, hours, day, date,month, and year information. The date at the end of themonth is automatically adjusted for months with fewerthan 31 days, including corrections for leap year. Theclock operates in either the 24-hour or 12-hour formatwith an AM/PM indicator. Two programmable time-ofdayalarms and a programmable square-wave outputare provided. Address and data are transferred seriallythrough an I2C bidirectional bus.A precision temperature-compensated voltage referenceand comparator circuit monitors the status of VCCto detect power failures, to provide a reset output, andto automatically switch to the backup supply when necessary.Additionally, the RST pin is monitored as apushbutton input for generating a reset externally.
Features♦ Accuracy ±2ppm from 0°C to +40°C♦ Accuracy ±3.5ppm from -40°C to +85°C♦ Battery Backup Input for ContinuousTimekeeping♦ Operating Temperature RangesCommercial: 0°C to +70°CIndustrial: -40°C to +85°C♦ Low-Power Consumption♦ Real-Time Clock Counts Seconds, Minutes,Hours, Day, Date, Month, and Year with Leap YearCompensation Valid Up to 2100♦ Two Time-of-Day Alarms♦ Programmable Square-Wave Output♦ Fast (400kHz) I2C Interface♦ 3.3V Operation♦ Digital Temp Sensor Output: ±3°C Accuracy♦ Register for Aging Trim♦ RST Input/Output♦ UL Recognized
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