I’m not worried about losing the time when the battery is removed. If you remove the battery in your personal vehicle, you have to reset all the clocks. People are used to this fact, I think.
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I’m not worried about losing the time when the battery is removed. If you remove the battery in your personal vehicle, you have to reset all the clocks. People are used to this fact, I think.
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A voltage Regulator is probably overkill. A 3.3v Zener in series with a Resistor should suffice. Zeners are noisy, so a small Capacitor across it would keep the RTC happy, but you might not even need it. Actually, if you made it something like a 1uF, it probably would have enough charge to keep the RTC Backed-Up for an hour or more.
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"A 3.3v Zener in series with a Resistor should suffice."
In series?
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You should want to put it in parallel? A 3.3v Zener directly across a 12v car Battery is something you will only try once - Don't hold the Zener in your fingers when you do it!
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So to recap:
12V (battery) --> Resistor --> Zener K--> 1uF Cap --> DS1307
Both the Zener Anode and Cap get tied to Common.
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Yes, I think you've got it...
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Oh sure one up me with a picture.
Yeah thats what I had, we are both on the same page.
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