4 ms·

Datasheet here: http://www.chronos.co.uk/files/pdfs/sym/sa.45s.pdf http://www.chronos.co.uk/files/pdfs/sym/sa.45s.pdf 120mW, 3.3V? Totally doable as a wristw

• sbierwagen 12y ago
  120mW, 3.3V? Totally doable as a wristwatch. I guess this is sarcasm? Typical quartz wristwatch power consumption is closer to .01mW. You could do it with a rechargeable battery, like a smartwatch, though you'd be recharging it every night, like your phone.
  • danpat 12y ago
    Perhaps I should've said "wristwatch formfactor", you're right, battery performance would not approach cheap digital watch, not by a long shot. But at at 120mW, you'd be able to get a few hours out of it with a CR2032 cell, which is better than useless. Garmin made GPS wrist units that up until recently have done no better than this, although admittedly, there's probably more utility in having a GPS on your wrist than an atomic clock. Your could write "HOURS AND HOURS OF BATTERY LIFE!!" on the packaging.
    • sbierwagen 12y ago
      Yeah, but lithium coin cells are $5 each when your end user buys them at the grocery store.
      • danpat 12y ago
        Good point, that totally kills the economics of this project.