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 <[email protected]> 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 >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
