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- Path: sparky!uunet!olivea!decwrl!access.usask.ca!kakwa.ucs.ualberta.ca!ersys!outlan!grant.ranson
- From: grant.ranson@outlan.ersys.edmonton.ab.ca (Grant Ranson)
- Newsgroups: sci.electronics
- Subject: Re: hex display
- Message-ID: <2740.140.uupcb@outlan.ersys.edmonton.ab.ca>
- Date: 30 Jul 92 17:13:00 GMT
- Reply-To: grant.ranson@outlan.ersys.edmonton.ab.ca (Grant Ranson)
- Organization: Outland BBS-UUCP
- Lines: 46
-
- TO:ALL
- FROM:grant.ranson@outlan.ersys.edmonton.ab.ca
-
- (I sent this message on July 28th, 1992, but it looks like my
- off-line reader nuked the last couple of sentences. Sorry for any
- confusion. Here we go again:) Grant.
-
- A further suggestion, regarding the hex display question
- mentioned below:
- >
- > In article <55066@mentor.cc.purdue.edu>
- >] falatic@mentor.cc.purdue.edu (MacGyver) writes: Hi! I am
- >] looking for a chip to convert BCD (actually, straight 4 bit
- >] binary) to Hexadecimal (A-F). I need something LIKE a 7447
- >] driver, but that one does not treat 10d-15d the way I need.
- >] Anyone who can help, please reply thru E-Mail if possible, or
- >] post here.
- >
- > How's your budget? :-) The IDEAL part is the HTIL311 display
- > from Texas Instruments. Inside the packeage are: a four bit
- > latch (tristate), BCD to display converter, LED drivers, and a 5
- > X 7 matrix of LEDs. Apply BCD data to the input pins, pulse the
- > DV ( data valid ) pin, and presto, hex code shows up on the
- > display.
- > I'm using these in a DTMF project I'm working on. Unfortunatly
- > the last time I dared to ask they cost about $13 each, but still
- > a cool part.
- > John
- >
- You might want to try programming a small EPROM (2708-style) with a
- table containing segment pattern info for each of the 16 possible
- inputs. Connect the incoming data to a0..a3 of the 2708, and feed
- its d0..d7 outputs to something like a 74LS244 for current drive.
- You didn't mention how many digits you require, but it would be fairly
- easy to add mux circuitry to this design.
-
- I realize that this suggestion is primitive compared to the fancy
- displays that John mentioned, but perhaps it will help in some way.
-
- Grant (grant.ranson@outlan.ersys.edmonton.ab.ca)
-
-
-
-
- ---
- ~ MMST 2.09 UnRegistered !Xa
-