If you've read up on my notes thus far, you'll know that I am half expecting the SEPS525 to perform at 10 MHz. However, most datasheets document the serial speed as 16.667 MHz. Based on that, I decided to try and run my SPI bus as close to this frequency as possible.

Side note. I love accurate time. 0.5 second accuracy is a personal minimum requirement when working with various elements of my computers. I'm a photographer as well so tenths of a second and faster mean a world of difference for me. It bugs when My atomic wrist watch doesn't sync each night as it likes to skip ahead ~1 second per day. Thanks to our wonderful benefactors here at HaD, a few select articles, and Dave Jones' two talks, I knew I had a bit to learn in order to pick out a suitable oscillator.

Why does this matter? D-DAQ has a logging function. By nature of this, I want accurate time. I had to determine stability vs cost. I settled on a spec of no greater than 10 ppm and a frequency as close to a power of 2 as I could get. I ended up settling on a MEMS oscillator, the ASVMB-16.384MHZ-XY-T, initially. I may switch over to the XTC7009, but, though its a snippet, I don't want to have to add code to have it track time properly.

So, I have 2 options:

• High precision and lessor accuracy that requires manual correction
  
• High accuracy and poor precision requiring code to correct precision