From: jeroen@nospam.please
On 11/26/25 18:00, john larkin wrote:
> On Wed, 26 Nov 2025 16:24:52 GMT, Jan Panteltje
> wrote:
>
>>> Bill Sloman wrote:
>>>> On 26/11/2025 8:16 pm, Jan Panteltje wrote:
>>>>> "Tom Del Rosso" wrote:
>>>>>> john larkin wrote:
>>>>>>
>>>>>> Good on-chip oscillators would be cool, on uPs and FPGAs.
>>>>>
>>>>> I have an electric oven that seems to use the on-chip oscillatior. The
>>>>> clock gains a few minutes a day. Thay could have omitted the clock and
>>>>> no one would miss it.
>>>>
>>>> On chip oscillators are temperature dependent
>>>
>>> But some more so that others. I had cheap Casio watch that I bought in
>>> the 1980's and it went through three lithium batteries until I managed
>>> to leave it in the washing machine a couple of years ago, which wrecked it.
>>
>> https://casiosupport.zendesk.com/hc/en-us/articles/3600001011
2-Quartz-movemCASIO AMERICA, INC. Watches Atomic/WaveCeptor
>> All Casio watches have Quartz movements.
>> Quartz-is powered by an electronic oscillator synchronized by quartz
crystal.
>> The electric current causes the quartz inside to pulsate with a precise
frequency
>
> Probably all watches now have an off-chip quartz tuning-fork
> resonator, usually 2^15 Hz. MEMS resonators are getting pretty good
> lately, and the resonator and the oscillator circuit can be on the
> same silicon chip, so I expect MEMS watches soon.
We had a problem with Apple phones here at CERN. People working
with helium found that their phone soon broke down. It turned out
that helium leaking into the (MEMS based?) resonator damped it
enough to kill the clock oscillator.
Jeroen Belleman
>
> Bulova once made a watch that used a low frequency tuning fork
> resonator that directly operated a tiny ratchet.
>
> Given that everybody carries a phone now, why have a watch?
>
>
> John Larkin
> Highland Tech Glen Canyon Design Center
> Lunatic Fringe Electronics
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