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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.
Features:
- 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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