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There is now a 17cm3 atomic clock chip on the market for about $2300, well under the price of a high-end watch. I'm surprised nobody's made a wristwatch with t
by daniel-cussen 13y ago
There is now a 17cm3 atomic clock chip on the market for about $2300, well under the price of a high-end watch. I'm surprised nobody's made a wristwatch with that.
The chip: CSAC SA.45s.
- userbinator 13y agoGiven that they're advertising military applications, I wouldn't be surprised if there are export regulations on such components.
- mseebach 13y agoBecause a >>$2300 wristwatch is a piece of jewelry, not a way to tell accurate-to-the-second time. Typically, it will have an intricate mechanical movement and be almost as accurate as a $5 quartz-driven electronic watch from the gift shop.
- tesseract 13y agoAt that price point it's all about being unique. A quartz watch isn't unique - but a watch based on a $2300 atomic-clock-on-a-chip sure would be.
- iamben 13y agoAbsolutely. See Slyde watches: https://www.slyde.ch/ https://www.slyde.ch/ $5k+ for a watch with an LCD screen you can update via software. I appreciate they use high materials in the construction, but the profit margin on these must be huge.
- danpat 13y agoDatasheet 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 wristwatch.
- sbierwagen 13y ago120mW, 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 13y agoPerhaps 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 13y agoYeah, but lithium coin cells are $5 each when your end user buys them at the grocery store.
- danpat 13y agoGood point, that totally kills the economics of this project.
- __alexs 13y agoThey have. http://www.ablogtowatch.com/bathys-hawaii-cesium-133-atomic-wrist-watch-accurate-second-1000-years/ http://www.ablogtowatch.com/bathys-hawaii-cesium-133-atomic-...