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An Arduino compatible library for ISL1208 RTC IC from Intersil.
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.vscode Updated example, updated some functions May 25, 2019
LICENSE Update Jun 16, 2019


An Arduino compatible library (will support ESP8266, ESP32 or pretty much any other boards with Arduino support) for Intersil ISL1208 real-time clock IC available in MSOP-8 package. Following are its features.

  • Real Time Clock/Calendar
    • Tracks Time in Hours, Minutes, and Seconds
    • Day of the Week, Day, Month, and Year
  • 15 Selectable Frequency Outputs
  • Single Alarm
    • Settable to the Second, Minute, Hour, Day of the Week, Day, or Month
    • Single Event or Pulse Interrupt Mode
  • Automatic Backup to Battery or Super Capacitor
  • Power Failure Detection
  • On-Chip Oscillator Compensation
  • 2 Bytes Battery-Backed User SRAM
  • I2C Interface
    • 400kHz Data Transfer Rate
  • 400nA Battery Supply Current
  • Same Pin Out as ST M41Txx and Maxim DS13xx Devices
  • Small Package Options
    • 8 Ld MSOP and SOIC Packages
    • 8 Ld TDFN Package
  • Pb-Free Available (RoHS Compliant)

Link to datasheet :


A full tutorial of this library is available at my project website -

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