DS3231SN#

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1. Description

The DS3231SN# is a low-cost, extremely accurate I2C real-time clock (RTC) with an integrated temperaturecompensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, and maintains accurate timekeeping when main power to the device is interrupted. The integration of the crystal resonator enhances the long-term accuracy of the device as well as reduces the piece-part count in a manufacturing line. The DS3231SN# is available in commercial and industrial temperature ranges, 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 the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with an AM/PM indicator. Two programmable time-of day alarms and a programmable square-wave output are provided. Address and data are transferred serially through an I2C bidirectional bus. A precision temperature-compensated voltage reference and comparator circuit monitors the status of VCC to detect power failures, to provide a reset output, and to automatically switch to the backup supply when necessary. Additionally, the RST pin is monitored as a pushbutton input for generating a μP reset.

2. Feature

    1. High-precision RTC comprehensively manages everything timing function

        - Real-time clock counts seconds, minutes, hours, day of month, month, day of week and years, leap year compensation is valid until 2100

        - Accuracy of ±2ppm from 0°C to +40°C

        - Accuracy of ±3.5ppm from -40°C to +85°C

        - Digital temperature sensor output: ±3°C accuracy

        - RST output/button reset debounced input

        - Two time alarms

        - Programmable square wave output signal

    2. Simple serial interface to connect to most microcontroller

        - Fast (400kHz) I2C Interface

    3. Backup battery input for continuous timekeeping

        - Low power operation extends battery backup run

        - 3.3V operation

    4. Operating temperature range: commercial (0°C to +70°C) and Industrial (-40°C to +85°C)

    5. Underwriters Laboratories® (UL) Recognized

3. Applications

    1. Servers

    2. Telematics

    3. Utility Power Meters

    4. GPS