[time-nuts] [Solved] Looking for multiple PPS timestamp logging

Kevin Rosenberg kevin at rosenberg.net
Wed Oct 5 16:02:58 EDT 2011


On Oct 4, 2011, at 11:42 AM, Mark Sims wrote:
> Use an LM34 sensor,  not the LM35.  It has twice the resolution per volt since it outputs in degrees F,  not degrees C.

That's a good idea. That's one issue that I have with a 10-bit ADC common to many MCUs, is the
low voltage of 0.20 to 0.28 mV in the office.

> Better yet,  use the DS1620 (old revision) that is used on the Tbolt.  It has a digital interface.  It will give you around 0.01C res without any ADC conversion noise, etc.

That's a good idea. In fact, I saw that I have some DS1631 samples on the shelf.
I like that idea as that can be bit-banged by a simple, small MCU on same
board as the XO.

Thanks for the thoughts, Mark!

Kevin





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