DS1307 issues

I posted a few days ago about a stock DS1307 design I used in a '328P clock display circuit.

The source of the problem was found - my customer was testing with 4.7 ohm I2C pullup resistors, and not 4.7K ohm I had in the parts list. So while my properly equipped test board worked fine, his would drain a coin cell dead in 24 hours.

I don't understand the path for that to happen within the DS1307, but happen it did.

That sh*t does seem to happen now and then.

Thanks for the followup.

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The price you pay for a "strong" pullup ; )