DESCRIPTION

    The AT8337 serial real-time clock is a low-power clock/calendar with two programmable time-of-day alarms and a programmable square-wave output. Address and data are transferred serially through an I²C bus. The clock/calendar provides 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 AM/PM indicator.

    The device is fully accessible through the serial interface while V_CC is between 1.8V and 5.5V. I²C operation is not guaranteed below 1.8V. Time  keeping operation is maintained with V_CC as low as 1.3V.

APPLICATIONS

    Handhelds (GPS, POS Terminal, MP3 Player)

    Consumer Electronics (Set-Top Box, VCR/Digital,Recording)

    Office Equipment (Fax/Printer, Copier)

    Medical (Glucometer, Medicine Dispenser)

    Telecommunications (Router, Switch, Server)

    Other (Utility Meter, Vending Machine, Thermostat, Modem)

FEATURES

    Completely Manages All Timekeeping Functions

    -Real-Time Clock (RTC) Counts Seconds,

     Minutes, Hours, Day, Date, Month, and Year with Leap-Year Compensation Valid Up to 2100

    -Two Time-of-Day Alarms

    -Programmable Square-Wave Output

    -Defaults to 32kHz on Power-Up 

    Interfaces with Most Microcontrollers 

    -I²C Serial Interface

    Surface-Mount Package with an Integrated Crystal (AT1337C) Saves Additional Space and Simplifies Design

    40°C to +85°C Industrial Temperature Range

    Supports Operation in a Wide Range of Applications

TYPICAL OPERATING CIRCUIT