[time-nuts] Ultra low power RTC
Bob kb8tq
kb8tq at n1k.org
Thu Mar 8 00:38:03 UTC 2018
Hi
> On Mar 7, 2018, at 6:33 PM, Mike Cook <michael.cook at sfr.fr> wrote:
>
>
>> Le 7 mars 2018 à 11:10, Attila Kinali <attila at kinali.ch> a écrit :
>>
>> On Tue, 6 Mar 2018 21:57:32 -0500
>> Bob kb8tq <kb8tq at n1k.org> wrote:
>>
>>> Assuming you are going to run it off a battery. What’s the self discharge
>>> rate on a reasonable battery?
>>
>> With supply currents below 100nA you can assume that you are likely
>> to be limited by the self-discharge using coin sized LiMnO2 cells
>> (e.g. a CR2032 is specced in the order of 100-300nA self-discharge).
>> For the smaller cells, you have to check which one is larger, but
>> they are of the same order of magnitude.
>
> This is interesting. When you talk of self discharge, is there any way of harnessing that. Is that what the chip manufactures are doing?
Self discharge = current flowing through the internal elements of the cell (plus
other long term degradation effects).
Bob
>
>>
>>
>> Attila Kinali
>> --
>> It is upon moral qualities that a society is ultimately founded. All
>> the prosperity and technological sophistication in the world is of no
>> use without that foundation.
>> -- Miss Matheson, The Diamond Age, Neil Stephenson
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