Big big big memory or tiny SDs!


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  1. #1
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    Default Big big big memory or tiny SDs!

    Okay, here's a good one. I need to store some .bmp files for retreival and display on an OLED display. Each file is 48KB, can't be compressed, and I will need at least 25 of them. The largest serial flash memory seems to be around 2 Meg. I'd like at least 8 Meg but I don't want it removable. Any ideas, or will I have to go SD?
    And... On that note, has anyone got a line on micro SD card sockets?
    Thanks,
    Ron

  2. #2
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    No need for flash card, M25P16 will be more than enough. 16Mb and SPI. No need for extra annoying socket. small, cheap and reliable.

    http://www.st.com/stonline/books/pdf/docs/10027.pdf
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

  3. #3
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    also W25P16VSFIG.
    http://www.winbond-usa.com/products/...P80-16-32j.pdf

    Both above are supported in my BKPrecision 844A.

    Never used them so far.
    Last edited by mister_e; - 24th May 2007 at 22:43.
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

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    Thanks Steve,
    I have a 1 MByte chip from ST, but I would really like some acreage! How about the memory inside the thumb drives?

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    Thumb drive? USB ones? If so you should have a look to MAX3421E, this should do the trick. Nice reference http://www.ghielectronics.com/details.php?id=13

    Those are in stock here... never had any time to play with...

    SD card pinout
    http://pinouts.ru/Memory/sdcard_pinout.shtml
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

  6. #6
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    Quote Originally Posted by Ron Marcus View Post
    Thanks Steve,
    I have a 1 MByte chip from ST, but I would really like some acreage! How about the memory inside the thumb drives?
    How about the Atmel DataFlash chips? They're gettin' big these days (big as in good capacity)

    I played with this awhile back, converted it to PBP (which was a piece of cake). A bit on the slow side, could've had faster transfers had I used the SPI module on the PIC itself.

    http://www.emesystems.com/BS2flash.htm
    http://www.digikey.com/scripts/DkSea...463292&Site=US

    $2.37USD each at Digikey.

  7. #7
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    Quote Originally Posted by skimask View Post
    How about the Atmel DataFlash chips? They're gettin' big these days (big as in good capacity)
    I've also used the Atmel Dataflash (AT45DB321C (32MB)). Worked well with Shiftin/Shiftout. Also worked with the Hardware SPI, just a little harder to setup.

    The hardest part is finding a supplier with some in stock. I think I got some obsolete SOIC parts from Arrow, but it's been a while. Digi-key lists all of there compenents as Non-Stock, but you might give them a call.

    SteveB

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    I found a supplier for the micro SD sockets. I was thinking of breaking out the old "FAT" code and installing it permanently on the board. For my proto, I will more than likely use the ST part. The down side to the SD card is the power consumption...but you can't beat the $15.- price!
    Thanks for the leads,
    Ron

  9. #9
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    Quote Originally Posted by SteveB View Post
    The hardest part is finding a supplier with some in stock. I think I got some obsolete SOIC parts from Arrow, but it's been a while. Digi-key lists all of there compenents as Non-Stock, but you might give them a call.

    SteveB
    I just checked Digikey. Searched for 'Atmel Dataflash' and clicked 'Items in Stock'. I get 42 results for parts in stock, ranging from 1Mbit up to 64Mbit parts.

  10. #10
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    Quote Originally Posted by skimask View Post
    I just checked Digikey. Searched for 'Atmel Dataflash' and clicked 'Items in Stock'. I get 42 results for parts in stock, ranging from 1Mbit up to 64Mbit parts.
    Yep. I must have narrowed my previous search too much. 16Mb SOIC for $2.37.

    SteveB

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