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Cap backup of real time clock

 
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treitmey



Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA

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Cap backup of real time clock
PostPosted: Tue Jul 12, 2005 10:51 am     Reply with quote
Has anyone made a circuit that uses a 1F supercap to backup/keep running
a M41T80M6E Real time clock? I was thinking of using a
panasonic EEC-S5R5V105 Super cap. Vertical mount.

I just want to keep the clock going for 4-5 days with out power,.. and then start back up when power is applied, and have the right time.

I've read the apnotes and such, I just don't have a part to proto-type, and I wanted to know if this has worked for someone.

Last edited by treitmey on Tue Jul 12, 2005 1:12 pm; edited 2 times in total
MikeValencia



Joined: 04 Aug 2004
Posts: 238
Location: Chicago

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PostPosted: Tue Jul 12, 2005 11:12 am     Reply with quote
I did a google search for "Supercapacitor" and "RTC" and found the following on Maxim:

http://www.maxim-ic.com/appnotes.cfm/appnote_number/3517/ln/en

They even show a supercap calculator in the site.
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