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RTCEval

This is a long-term experiment running thirteen RTCs for some time in order to see how they live up to their specifications.

Ground truth is delivered by a DCF77 receiver and the deviation is measured in msecs every day at midnight. In addition, temperature is measured every hour. All that is stored in a serial EEPROM with space for 1024 days. The plan is to let the experiment for a year or two.

The RTCs that will participate are:

  • DS1307,

  • DS1337,

  • DS3231SN,

  • DS3231M,

  • MCP79410,

  • PCF8523,

  • PCF8563,

  • RS5C372,

  • RV-3028,

  • RV-3032,

  • RV-8523,

  • RV-8803, and

  • SD2405.

This is how it looks before I started to connect the RTCs to the I2C multiplexers and the MCU.

start