Shop OBEX P1 Docs P2 Docs Learn Events
DS1302 battery backup — Parallax Forums

DS1302 battery backup

jreevejreeve Posts: 6
edited 2007-09-05 16:08 in BASIC Stamp
Hello All. I want to use a DS1302 as a time-keeper for a Stamp project, and had a question about the battery backup. I'd like to use a small lithium battery (>3 V) as the backup, connected to Vcc1. If I'm reading the data sheets correctly, I need only connect the battery to Vcc1 and that's it. I don't need to enable trickle charging, set the number of diodes, resistor value, etc. because I'm not charging the lithium battery. When the main power (Vcc2) falls the chip will then automatically switch to battery power. Is it this simple??? Thanks for any help, John R.

Comments

  • NewzedNewzed Posts: 2,503
    edited 2007-09-05 00:19
    You got it right, John.· The solder-in battery is Digikey P191.· If you want to use a battery holder, it is Digikey 500K and the coin battery is Digikey P183.

    Sid

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Yesterday is history, tomorrow is a mystery, and today is a gift.

    That is why they call it the present.

    Don't have VGA?
    Newzed@aol.com
    ·
  • jreevejreeve Posts: 6
    edited 2007-09-05 16:08
    Thanks for the advice and info on the part numbers. Cheers, John
Sign In or Register to comment.