[time-nuts] Maxim DS1342

[Bob Camp]

Hi

In volume a 32KHz crystal is a sub 5 cent item. In high volume very sub 5 cents. The RTC chips are *way* more expensive.

Bob

On Nov 11, 2013, at 8:06 PM, Russ Ramirez <russ.ramirez at gmail.com> wrote:

> Hi Didier,
> 
> True this could be done in SW, and I should have mentioned that I
> considered that in my post. However, these chips offer several other
> functions that would add complexity to the code, and I've been looking for
> a reason to do a simple HW project and open source it through OSH Park
> anyway. I'm not looking to do this for just myself.
> 
> Looking across the TI and Microchip lines a bit, it strikes me as odd that
> more micros supporting integrated RTCs actually use two I/Os for a 32 kHz
> crystal option. Why they support an RTC is not mysterious at all, but why
> not the option at to drive the 1 Hz clock directly rather than dividing 32
> kHz down to 1 Hz and using an extra I/O is odd when these I/Os are usually
> configurable anyway.
> 
> Russ
> 
> 
> You want to drive the RTC with an external PPS to get time/date into an
>> Arduino?
>> Why not feed the PPS to the Arduino and have it compute date and time?
>> 
>> It is really not that hard to count seconds. You don't really need an
>> external chip to do that.
>> 
>> Didier KO4BB
>> 
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