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DS1339 - I2C Serial Real-Time Clock

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.

Key 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 Time o Automatic Power-Fail Detect and Switch Circuitry o Trickle-Charge Capability.
  • Underwriters.

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Other Datasheets by Maxim Integrated (now Analog Devices)

Part Number Description
DS1339A Serial Real-Time Clock
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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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.