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3.3 V Logic interface to stamp? — Parallax Forums

3.3 V Logic interface to stamp?

ArchiverArchiver Posts: 46,084
edited 2001-02-27 17:56 in General Discussion
3.3 V Logic interface to stamp?

Hi!

I am wondering if anyone knows of an easy way to interface 3.3 volt logic with the stamp.· Is this possible?

Thanks!

--Scott

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2001-02-27 17:13
    At 08:36 AM 2/27/01 -0800, you wrote:

    >Hi!
    >
    >I am wondering if anyone knows of an easy way to interface 3.3 volt logic
    >with the stamp. Is this possible?
    >
    >Thanks!
    >
    >--Scott
    >
    >Your use of Yahoo! Groups is subject to the
    ><http://docs.yahoo.com/info/terms/>Yahoo! Terms of Service.


    Try something like this....

    2.2K 4.7K
    Stamp I/O <<<--o--/\/\--o--/\/\---->>> GND
    | |
    | | 220
    o---|<---o--/\/\---->>> 3.3V I/O
    generic







    Beau Schwabe IC Mask Designer
    National Semiconductor Network Products Division
    500 Pinnacle Court, Suite 525 Mail Stop GA1 Norcross, GA 30071
  • ArchiverArchiver Posts: 46,084
    edited 2001-02-27 17:37
    RE: [noparse][[/noparse]basicstamps] 3.3 V Logic interface to stamp?

    This circuit looks good.· I am hoping for some kind of a bus-interface type of chip that would have 5V logic on one side and 3.3 V logic on the other.· I'm want to use nearly all of the datalines on the stamp to access low-voltage logic and a circuit with discrete components would require a very large part count.· Would a wide-voltage CMOS buffer work?

    Scott


    Try something like this....

    ·················· 2.2K···· 4.7K
    Stamp I/O <<<--o--/\/\--o--/\/\---->>> GND
    ··············· |······· |
    ··············· |······· |· 220
    ··············· o---|<---o--/\/\---->>> 3.3V I/O
    ················· generic







    Beau Schwabe·················· IC Mask Designer
    National Semiconductor········ Network Products Division
    500 Pinnacle Court, Suite 525· Mail Stop GA1··· Norcross, GA 30071








    ·

    Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
  • ArchiverArchiver Posts: 46,084
    edited 2001-02-27 17:48
    I am not absolutely shure but to input 3.3.logic into Stamp it should'nt
    be a problem but the from reverse direction may be.
    ACJacques

    Scott Winn wrote:
    >
    > Hi!
    >
    > I am wondering if anyone knows of an easy way to interface 3.3 volt
    > logic with the stamp. Is this possible?
    >
    > Thanks!
    >
    > --Scott
    >
    > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
  • ArchiverArchiver Posts: 46,084
    edited 2001-02-27 17:56
    >This circuit looks good. I am hoping for some kind of a
    >bus-interface type of chip that would have 5V logic on one side and
    >3.3 V logic on the other. I'm want to use nearly all of the
    >datalines on the stamp to access low-voltage logic and a circuit
    >with discrete components would require a very large part count.
    >Would a wide-voltage CMOS buffer work?
    >
    >Scott
    >
    >
    >Try something like this....
    >
    > 2.2K 4.7K
    >Stamp I/O <<<--o--/\/\--o--/\/\---->>> GND
    > | |
    > | | 220
    > o---|<---o--/\/\---->>> 3.3V I/O
    > generic


    Pericom offers a lot of inter-bus chips:
    http://www.pericom.com/products/index.html

    It could be a lot simpler if each line will be either an input or an
    output, but not both. Beau's clever circuit does both.

    -- Tracy
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