The comparator is a good choice.. I my last design i was using the comparator pins, so i use a lm311 connected to INT pin... You should use an osciloscope to confirm if you'll have enough time to do what you want before the uC goes off... In my case i'm using a 1000uF cap. and i have 120ms to save the variables in eeprom... This time depends on your cap. size and your circuit... Bruno... --- In AVR-Chat@yahoogroups.com, John Samperi <samperi@...> wrote: > > At 12:01 PM 28/04/2008, you wrote: > >Use the ADC to measure the primary source voltage. > > I would use the comparator set at an appropriate > level so there isn't the need for software intervention > until the comparator's IRQ fires. > > Regards > > John Samperi > > ******************************************************** > Ampertronics Pty. Ltd. > 11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA > Tel. (02) 9674-6495 Fax (02) 9674-8745 > Email: john@... > Website http://www.ampertronics.com.au > *Electronic Design * Custom Products * Contract Assembly > ******************************************************** >
Message
Re: EEPROM write and power failure
2008-04-28 by Bruno