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Old 28 October 2010, 23:49   #17
Loedown
Precious & fragile things

 
Join Date: Feb 2009
Location: Victoria, Australia
Posts: 1,946
Quote:
Originally Posted by orange View Post
@brett

that's why some say we should use Schottky diode. the specs for RTC chip say minimum voltage is 2,2V (IIRC) but I think it can use even lower. I never had problems with ordinary diodes, they worked for years.
With a standard silicon diode the theoretical voltage drop still keeps the RTC at 2.6V assuming perfect battery condition, those button cells usually slowly drift down to around 2.9 and then when they are spent quite rapidly drop towards zero. Changing the battery and resetting the clock isn't a massive task.
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