I2C Serial Real-Time Clock
GENERAL DESCRIPTION
The DS1339 serial real-time clock (RTC) is a lowpower clock/date device with two programmable timeof...
Description
GENERAL DESCRIPTION
The DS1339 serial real-time clock (RTC) is a lowpower clock/date device with two programmable timeof-day alarms and a programmable square-wave output. Address and data are transferred serially through an I2C bus. The clock/date 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 DS1339 has a built-in powersense circuit that detects power failures and automatically switches to the backup supply, maintaining time, date, and alarm operation.
APPLICATIONS
Handhelds (GPS, POS Terminals) Consumer Electronics (Set-Top Box, Digital
Recording, Network Appliance) Office Equipment (Fax/Printers, Copier) Medical (Glucometer, Medicine Dispenser) Telecommunications (Routers, Switches, Servers) Other (Utility Meter, Vending Machine, Thermostat,
Modem)
Pin Configurations appear at end of data sheet.
DS1339 I2C Serial Real-Time Clock
BENEFITS AND FEATURES Completely Manages All Timekeeping
Functions o Real-Time Clock Counts Seconds,
Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100 o Two Time-of-Day Alarms o Programmable Square-Wave Output o Oscillator Stop Flag
Interfaces to Most Microcontrollers o I2C Serial Interface
Low-Power Operation Extends Battery Backup Run Tim...
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