but this is the circuit used in das1307 module, so I do not think they have put these components without reason.
Thank you I will try with removing those resistances.Hi,
So you think they know better than the manufacturer of the DS1307?
As a professional electronics designer - I can´t comprehend this behaviour to rather rely on on crappy cheap tinkerers schematics than the information of the original manufacturer.
I mean - simply the fact that it does not work - should result in some skepsis.
From my decades of experience: Do it like the datasheet recommends and it will work reliably.
Klaus
It is OK with 3V as well as 5V. But I want it to continuous working by battery after disconnecting 3V. Based on datasheet ds1307 should work by battery after disconnecting 3vI agree, although I still think it is done in error but the modules your links point to just say "VCC" and I think it means 5V not 3.3V.
If you start with 5V, the diode and potential divider will produce around 3.3V at the battery, meaning no current is drawn from it while 5V VCC is present but if the 5V is removed, all it does is drain the battery faster.
Brian.
It´s not clear. Please use the same terminology as in the datasheet.It is OK with 3V as well as 5V. But I want it to continuous working by battery after disconnecting 3V. Based on datasheet ds1307 should work by battery after disconnecting 3v
Which "3V"?But I want it to continuous working by battery after disconnecting 3V. Based on datasheet ds1307 should work by battery after disconnecting 3v
I do not understand why you make the issue confusing. The question is simple, why this RTC does not work with CR2032 battery, based on this designed schematic for module.Hi,
It´s not clear. Please use the same terminology as in the datasheet.
* It is Ok with 3V as well as 5V --> what does "It" mean in this case?
VCC is specified for 4.5V .. 5.5V.
VBatt is specified for 2.0V .. 3.5V.
As soon as VCC is applied, then the current drawn at VBatt is negligible.
Which "3V"?
VCC is not 3V. It has to be 4.5V ... 5.5.V.
The battery is 3V, but if you disconnect the battery there is no 3V anymore.
Klaus
This question has been clearly answered multiple times by different posters.The question is simple, why this RTC does not work with CR2032 battery, based on this designed schematic for module.
You gave perfect informations.I do not understand why you make the issue confusing.
And thanks for your perfect solutions.Hi,
This question has been clearly answered multiple times by different posters.
You gave perfect informations.
It´s all my fault. Sorry for wasting your time. I will not bother you again.
Klaus
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