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 keep showing my age. I keep using a DS1307
Charles Linquist
|
With an accuracy of..??Originally Posted by mackrackit
Better or worse than a good crystal? (10-20ppm?)
Just curious, but too tired to go hunt up the 1337 data sheet...
steve
|
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
Members who have read this thread : 1You do not have permission to view the list of names.
Posting Permissions
Bookmarks