Em 01/01/2013 13:01, Mark Hanchey escreveu:
> On 12/31/2012 7:12 PM, David Duffy (AVD) wrote:
>> Maybe using the GPS to correct an on-board RTC would be a better option?
>>
>> Some of the field units have GPRS  connectivity so I could maybe use
>> NTP, but a single solution for all of them would be nice.
>> David...
>>
>>
> Have you looked at any of the high accuracy RTC chips ? Intersil makes=20
> some that will auto calibrate based on the temperature and can run for=20
> years without losing time.
> http://www.intersil.com/en/products/timing-and-digital/rtcs/real-time-clo=
cks/ISL12022M.html
>
> Mark


Maxim's DS3231S is more precise, 2ppm from 0 to 40 celsius and 3.5ppm
from -40 to +85 celsius, against 5ppm of Intersil's part.
Isaac

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