Free Elektor Article: The RV-3029-C2 “Swiss Clock”

Free Elektor Article: The RV-3029-C2 “Swiss Clock”

Off-air awfully accurate drop-in RTC & calendar on I²C

This RTC & Calendar board is built around Micro Crystal’s type RV-3029-C2 integrated circuit. The ‘3029 is a real-time-clock/calendar (RTC) cheerfully communicating via the I2C protocol. It offers good precision out of the box, and fine precision when tweaked.


  • Micro Crystal RV-3029-C2 RTC/Calendar chip
  • Battery backup
  • Selectable clock output
  • 6 ppm max. error default
  • 3 ppm error achievable with DTCXO tweaking
  • I2C connectivity
  • Free Arduino test & config utility
  • Drop-in module

Free Elektor Article: The RV-3029-C2 “Swiss Clock” – [Link]

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Mike is the founder and editor of, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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