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Additional 24LC256 ? — Parallax Forums

Additional 24LC256 ?

Areal PersonAreal Person Posts: 197
edited 2006-12-21 16:20 in Propeller 1
Ok, I have one 24LC256 working. I currently have A0, A1, A2 and VSS grounded.

How do I hookup the second 24LC256 so I can have 2 for a total of 64k ?

I read the 24LC256 datasheet, but all it sayes is that it can be done.

I dont know where to put the wires.

-Areal



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I have a tree growing out of my head, but

what do you expect ? I'm a programmer.

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2006-12-21 03:26
    The A0,A1,A2 connections determine what addresses the EEPROM will respond to.
    They are binary as follows with 0=ground, 1=Vdd.

    0 - A2=Gnd, A1=Gnd, A0=Gnd
    1 - A2=Gnd, A1=Gnd, A0=Vdd
    2 - A2=Gnd, A1=Vdd, A0=Gnd
    3 - A2=Gnd, A1=Vdd, A0=Vdd
    4 - A2=Vdd, A1=Gnd, A0=Gnd
    5 - A2=Vdd, A1=Gnd, A0=Vdd
    6 - A2=Vdd, A1=Vdd, A0=Gnd
    7 - A2=Vdd, A1=Vdd, A0=Vdd

    The other pins of the EEPROM are connected the same as the first one
    (Vdd, Gnd, SCL, SDA, WP).
  • Areal PersonAreal Person Posts: 197
    edited 2006-12-21 03:54
    Mike, I wish I new 10% of what you·know about electronics hop.gif

    Your great ! Thank you, Thank you, Thank you ! and also to everyone !

    Looks like I just sequence vdd &·gnd to specific pins of A0, A1 & A2·as I go from·chip 0 - 7.

    Soon, I'll be ready to start programming with spin ! I cant wait !

    I wish I knew how to read datasheets of·different chips, understand

    and know how to hookup the pins of the chip in order to use it correctly.

    Things like multipul banks (for RAM memory etc.) Strobe,· CAS, CLK etc. etc.

    I need to learn these things·so I can better use my Propeller chip. I have a ways to go.

    Any advise on reusable fundamentles on how to do this or tutorials/advise

    is welcome, and much needed.

    Thank You,

    -Areal·Person (Mark)

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    I have a tree growing out of my head, but

    what do you expect ? I'm a programmer.
  • parts-man73parts-man73 Posts: 830
    edited 2006-12-21 14:38
    How bout just using 1 - 24AA512 instead of 2 - 24LC256's ?

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    Brian Meade

    "They who dream by day are cognizant of many things which escape those who dream only by night" - Edgar Poe
  • Areal PersonAreal Person Posts: 197
    edited 2006-12-21 16:20
    Thanks for the advise.

    However, I going to be going to a FM24C512 (Ramtron FRAM) 5v (64kbytes)
    I'll be installing 4

    I'm just using what I have right now until my other parts come in in a week or so.

    Then I'll be building a 5v voltage circuit to drive the bigger FRAM chips.

    I'm also going to be hooking up a FM18L08-70-PG256K (FRAM) Thanks to IAI-Captains
    wonderfull instructions ! given in this thread.

    http://forums.parallax.com/showthread.php?p=621957

    -Thanks
    -Areal

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    I have a tree growing out of my head, but

    what do you expect ? I'm a programmer.

    Post Edited (Areal Person) : 12/21/2006 4:37:37 PM GMT
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