[time-nuts] Maxim DS1342

[Robert LaJeunesse]

Many times the 32KHz oscillator is just used for ultra-low power rudimentary CPU timing, not so much for a "time of day" clock. The crystal gives more reliable timing than an RC delay, and the low power works fine for a "press to wake up" type application.

Bob LaJeunesse



>________________________________
> From: Russ Ramirez <russ.ramirez at gmail.com>
>To: time-nuts at febo.com 
>Sent: Monday, November 11, 2013 8:06 PM
>Subject: Re: [time-nuts] Maxim DS1342
> 
>
>Hi Didier,
>
>...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
>