The car's battery will be shut off (this is on a race-car, so rules =20
dictate that).

The clock will be used for a datalogger.

Cheers,
-Neil.




Quoting Ruben J=F6nsson <maxruben@rjjournal.net>:

>
>> What is the minimum current draw you can get on your PIC 18F* in 'RTC on=
ly'
>> mode?
>> You may want to use a CR2050 (same as CR2032 but thicker, higher capacit=
y).
>>
>
> Since it is automotive you can use the battery you already have. The car
> battery. The current consumption in off state should be way less =20
> than the self
> discharge rate of the battery.
>
> Also, the temperature swing could be very large in an automotive =20
> application so
> you have to take this into account when it comes to oscillator accuracy a=
nd
> drift.
>
> What is the clock going to be used for?
>
> /Ruben
>
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> Ruben J=F6nsson
> AB Liros Electronic
> Box 9124
> 200 39 Malm=F6 Sweden
> www.liros.se
> Tel +46 40142078
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>



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