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Broken DS1302 — Parallax Forums

Broken DS1302

HumpeHumpe Posts: 10
edited 2008-01-01 20:23 in BASIC Stamp
I managed to brake my DS1302 Clock.

I wanted to have some sort of power backup, didnt have a battery so i connected a capacitor to it.

Didnt really know what i did :-) Just thought it would work :-) (Yes, im a real newbie). It work for a while but when I turned off and on my lab board the clock stopped to work.

Could someone have a look at my scheme and let me now were i went wrong and maybe give a comment on how i should have done it.
DS1302.GIF
576 x 500 - 4K

Comments

  • Twisted PairTwisted Pair Posts: 177
    edited 2007-12-30 16:46
    Humpe
    It is my understanding that you can't have Vdd running to both Vcc1 & Vcc2. It must be one or the other. See the attached PDF regarding battery backup. You also may have damaged the chip. Remove the wiring and capacitor that you added and power up the circuit to see if the clock is working. If not, replace the chip and follow the guidelines in the PDF.

    Twisted Pair....

    Post Edited (Twisted Pair) : 12/30/2007 4:52:48 PM GMT
    pdf
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    ds1302rtc.pdf
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    ds1302.pdf
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  • HumpeHumpe Posts: 10
    edited 2008-01-01 13:45
    Thanks for putting me in the right direction. I actually thought that i had to "load" the capacitor from Vdd but it apperantly loads from the Vcc1 pin. It now works as i want. (The DS1302 wasnt broken, just i bit tired).
  • Twisted PairTwisted Pair Posts: 177
    edited 2008-01-01 20:23
    Glad that you got it to work Humpe. This Forum is usually more responsive with help but I guess that because of the holiday's, the knowledgable ones were spending time with their families. The Parallax web-site has a lot of information regarding all kinds of topics and best of all, the downloads are free....

    Twisted Pair....
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