Shop OBEX P1 Docs P2 Docs Learn Events
Keypad Encoder — Parallax Forums

Keypad Encoder

VladimirVladimir Posts: 64
edited 2006-04-21 21:50 in BASIC Stamp
Any of you guys know any Keypad encoders that I can use on the keypad?

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Thanks,

Vladimir
·

Comments

  • PJAllenPJAllen Banned Posts: 5,065
    edited 2006-04-20 01:37
    74C922 is a 16-key decoder.· 74C923 is a 20-key decoder.
  • VladimirVladimir Posts: 64
    edited 2006-04-20 02:12
    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

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Thanks,

    Vladimir
    ·
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2006-04-20 02:34
    · 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.
    · [noparse][[/noparse]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
    922.JPG
    330 x 268 - 14K
    922.JPG 13.9K
  • Mohamed RefkyMohamed Refky Posts: 47
    edited 2006-04-21 21:50
    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.

Sign In or Register to comment.