The accuracy is not determined by the chip itself. The accuracy is determined by the crystal.
The accuracy is not determined by the chip itself. The accuracy is determined by the crystal.
Charles Linquist
The DS1337C has a built in OSC.
Saves you from setting up an accurate crystal.
Last edited by mackrackit; - 29th March 2010 at 03:34. Reason: To many 3s
Dave
Always wear safety glasses while programming.
I guess it is about the same as a good crystal.
DS1337C ONLY
The DS1337C integrates a standard 32,768Hz crystal in the package. Typical accuracy at nominal VCC and +25°C is approximately +10ppm. Refer to Application Note 58 for information about crystal accuracy vs. temperature.
Dave
Always wear safety glasses while programming.
Well, without reading AN58, it sounds comparable to a decent crystal.
Or is it..?at nominal VCC and +25°C
Sigh... so many data sheets, so little time...
steve
Ok, I don't know why I thought it was the chip datasheet that claimed a certain degree of accuracy.
If you want precise time keeping, an idea would be to use a cheap GPS module with PPS signal output (1 pulse per second).
Ioannis
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