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Thread: Keypad Encoder

  1. #1

    Default Keypad Encoder

    Any of you guys know any Keypad encoders that I can use on the keypad?

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    Thanks,

    Vladimir
    Last edited by ForumTools; 09-30-2010 at 11:05 AM. Reason: Forum Migration

  2. #2
    PJ Allen's Avatar
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    74C922 is a 16-key decoder. 74C923 is a 20-key decoder.
    Last edited by ForumTools; 09-30-2010 at 11:05 AM. Reason: Forum Migration

  3. #3

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    According to the data sheet provided, it requires so many other additional devices. is there an easier way

    data sheet found on: http://pdf1.alldatasheet.co.kr/datasheet-pdf/view/9283/NSC/74C923.html

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    Thanks,

    Vladimir
    Last edited by ForumTools; 09-30-2010 at 11:05 AM. Reason: Forum Migration

  4. #4
    PJ Allen's Avatar
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    What are you talking about? A couple of capacitors?
    What are you looking at, the'Block Diagram' (that's the internal workings, explained)?
    It's pretty danged easy. 4 or 5-bit output (depending which is used) and optional use of the 'Data Available' output. If this is "complicated" then you're in for a shock.
    [The inverter shown is not necessary, just keep OE at GND, it's OK.]

    Post Edited (PJ Allen) : 4/20/2006 2:40:52 AM GMT
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    Last edited by ForumTools; 09-30-2010 at 11:05 AM. Reason: Forum Migration

  5. #5

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    EDE 1144 - 4x4 Keypad Encoder IC

    The EDE1144 Keypad Encoder IC is designed to interface a matrix-type 4 row x 4 column (16 key or less) keypad to a microcontroller or other host processor. A one-wire serial or four-wire parallel interface returns the keypress data and can be used in conjunction with a 'data valid' signal for polled or interrupt-driven applications. The EDE1144 provides enhanced keypad features such as contact debouncing and key auto-repeat in an easy-to-use package that will lower software overhead in the host microcontroller and reduce the I/O pin requirements from eight to one, frequently resulting in the use of a less costly host microcontroller in your design.

    Last edited by ForumTools; 09-30-2010 at 11:05 AM. Reason: Forum Migration

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