Em 12/1/2011 20:06, Dwayne Reid escreveu:
> At 12:56 PM 1/12/2011, Gordon Williams wrote:
>
>> The question is the best way to get an accurate clock over this temperat=
ure
>> range.  I'm looking for something in the 4 to 10 Mhz range.  In past PIC
>> projects I've used in internal oscillator and don't have any experience =
with
>> crystals.
> Maxim makes a 32KHz stabilized module that is relatively=20
> inexpensive.  We use them here as intermediate standards for=20
> calibrating our other 32KHz crystal-based units.
>
> These units from Maxim are really rather good.  Sorry - don't recall=20
> the exact part number or price.
>
> dwayne

I use the DS3231 from Maxim. It is an I2C serial RTC with internal
crystal and temperature compensated (it uses a temperature sensor to
compensate for temperature changes, not keeping the temperature stable
like in an oven, and so it consumes very low power).
According to their data, it is stable to 2ppm.

Isaac

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