Brooke Clarke wrote:
Hi Bruce:
If a square meter of Styrofoam is 1.5 deg C/W then a cubic inch would be
39.37 * 39.37 * 1.5 or 2,325 deg C/W
The DS3231 dissipates about 1 mw when running. I'm not sure how to come
up with an allowable temp increase, but suspect it's based on not
exceeding the max allowed operating temp. But for this part the Temp
vs. freq curve is flattest at room temp so best to minimize the temp rise.
So: (1 deg C) / (0.001 W) = 1000 deg C/W, the same number you had.
That requires 185 g of Aluminum or about 69 cc volume or 4.25 cubic
inches. That's a block about 1.62" on a side.
How does that look?
you can also use U.S. R-values.. BTU/hr/ft^2/deg F.
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