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What EEPROMS can you use with the prop? — Parallax Forums

What EEPROMS can you use with the prop?

labsmokelabsmoke Posts: 38
edited 2008-03-22 00:32 in Propeller 1
Naturally, the 24LC256 works fine with the prop. But is there any other kind of eeproms with different sizes that can be used. the reason i ask is because i can not seem to buy the 24LC256 here in sweden. (or maybe im looking·at the wrong places)

ive tried the 24LC02, witch is a 256k eeprom with the exact same pinout and interface. But i get "Failed to verify"

Maybe its a stupid question like always, and maybe im just tired and crossed some wires but..

Is there anyone who has used different eeproms or is there a documented cross reference list of some sort.

thanks anyway!

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Comments

  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2008-03-21 11:41
    Seems like you got 2k of storage rather than 256k of storage. You can use larger than 256k, but smaller just won't work.

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  • labsmokelabsmoke Posts: 38
    edited 2008-03-21 12:11
    24LC02B is a 256kBx8 eeprom...doesent make sense i know..but its true.

    I was tired allright!! freaked.gif

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    Sometimes you have to rest your persuit of happiness and just be happy.

    Post Edited (labsmoke) : 3/21/2008 1:23:47 PM GMT
  • william chanwilliam chan Posts: 1,326
    edited 2008-03-21 12:44
    No. 24c02 is 2k bits = 256 bytes of eeprom only. Not 256K.
    I think you can get 24LC256 OR 24LC512 from Farnell.

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  • Bob Lawrence (VE1RLL)Bob Lawrence (VE1RLL) Posts: 1,720
    edited 2008-03-21 13:13
    From the data sheet: 24AA02/24LC02B
    2K I2C™ Serial EEPROM

    (24XX02*) is a 2 Kbit Electrically Erasable PROM.

    The device is organized as one block of 256 x 8-bit memory

    Source:

    ww1.microchip.com/downloads/en/devicedoc/21709c.pdf

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    Aka: CosmicBob

    Post Edited (Bob Lawrence (VE1RLL)) : 3/21/2008 1:18:18 PM GMT
  • labsmokelabsmoke Posts: 38
    edited 2008-03-21 13:20
    now i see..i missed that extra K when looking in the catalog...thats just bonkus...and embarrassing..

    but is there any other eeprom other than the 24LC256(512) that can work?

    not that i dont order from farnell from time to time but...

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    Sometimes you have to rest your persuit of happiness and just be happy.
  • Mike GreenMike Green Posts: 23,101
    edited 2008-03-21 14:27
    Atmel also makes EEPROMs with a 24C256 / 24C512 part number and these can be used as well.
  • crgwbrcrgwbr Posts: 614
    edited 2008-03-22 00:32
    Also, make sure the EEProms you choose can operate with all 3 address pins pulled low. I bought several 512K chips, but soon learned that they only worked when one on the address pins was pulled high. Not sure why they would design a part like this, but the Prop Tool couldn't see it.

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    Craig

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