Need a 7 seg display driver with hex capability - Electronic Circuits Projects Diagrams Free

ljcox · 21st February 2008, 05:26 AM

Does anyone know if there is a 7 segment display driver available that can output hexadecimal digits, ie. 0 ~ F?

I can only find them with 0 ~ 9.

Any advice will be appreciated.

Pommie · 21st February 2008, 06:13 AM

It would probably be easier to use a pic. Ambient recently posted this thread.

There was also a recent thread that used a 16F628 to do the same thing. I.E. take two 4 bit numbers and display them on a dual hex display.

Mike.

blueroomelectronics · 21st February 2008, 06:17 AM

If you're lucky you might be able to score a handful of TIL311 displays off eBay.

Torben · 21st February 2008, 08:51 AM

All the ones I can find so far seem to be either out of production or maybe overkill. I think the ICM7212 can do what you want (but I've only take a quick look at the datasheet)--but if you need only one digit, the 40-pin count and ~$6/unit price (at DigiKey) might be a problem. Maybe a sample?

Torben

ljcox · 21st February 2008, 11:16 AM

Quote:

Originally Posted by Pommie

It would probably be easier to use a pic. Ambient recently posted this thread.

There was also a recent thread that used a 16F628 to do the same thing. I.E. take two 4 bit numbers and display them on a dual hex display.

Mike.

Thanks Mike, a PIC would make it very easy. But, the person I'm helping lives far away and has very limited electronics knowledge.

So I doubt if he would want to use a PIC given the learning curve and the need for a programmer etc.

ljcox · 21st February 2008, 11:17 AM

Quote:

Originally Posted by Torben

All the ones I can find so far seem to be either out of production or maybe overkill. I think the ICM7212 can do what you want (but I've only take a quick look at the datasheet)--but if you need only one digit, the 40-pin count and ~$6/unit price (at DigiKey) might be a problem. Maybe a sample?

Torben

Thanks Torben, I'll have a look at the DS.

on1aag · 21st February 2008, 12:32 PM

Hi Len,

Avago still has some but actually getting them might be an entirely
different ballgame.

http://www.avagotech.com/products/pa...lel_interface/

on1aag.

Papabravo · 21st February 2008, 04:05 PM

Max6954

Icm7218

Mike, K8LH · 21st February 2008, 08:28 PM

Would something like this work? It outputs '0' through '9', 'A', 'b', 'C', 'd', 'E', and 'F' characters.

This is pretty much a finished PIC project (except I think we might have added a pull-down resistor on the base of the 2nd transistor). The code is posted further down in the first page of the following thread;

dual 7-segment display controller

Regards, Mike

Dean Huster · 22nd February 2008, 05:17 AM

There are 2 or 3 CMOS D/Ds that output hex. The older 9368 was another wonderful one and used constant current outputs so that you didn't need current limiting resistors. The TIL311, even back when they were more easily available, would usually set you back about $10 or more EACH!

Dean

Hero999 · 23rd February 2008, 11:45 AM

Why not use good old fashioned CMOS combinational logic?

It's pretty much your only solution if you don't want to program anything or spend loads of money on a specialised display.

EDIT:
What about the DM9368 or the MC14495?

blueroomelectronics · 23rd February 2008, 04:40 PM

There you go, like Hero999 said the MC14495 should be perfect.

Mike, K8LH · 24th February 2008, 12:59 AM

Is there another part number? Just tried searching for MC14495 on Jameco, Digikey, and Mouser and none of them turned up a product match.

blueroomelectronics · 24th February 2008, 03:31 AM

Probably been discontinued for years. Seems some TTL & CMOS chips are becoming harder to find.

That said, your 16F628A solution is probably cheaper too.

ljcox · 24th February 2008, 08:36 AM

Thanks for the responses.

A PIC solution would be perfect if I was doing it myself. The whole system could be done by a PIC with a few sundry components around it.

But the op I'm helping has very limited electronics knowledge and no PIC knowledge. So the learning curve for him would be very steep.

At the moment, I have suggested a decimal (BCD) solution in lieu of the hex one.

He initially rejected the BCD one but I think his reasoning is flawed.

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21st February 2008, 05:26 AM	(permalink)
ljcox	Need a 7 seg display driver with hex capability Does anyone know if there is a 7 segment display driver available that can output hexadecimal digits, ie. 0 ~ F? I can only find them with 0 ~ 9. Any advice will be appreciated. __________________ Len

21st February 2008, 06:13 AM	(permalink)
Pommie	It would probably be easier to use a pic. Ambient recently posted this thread. There was also a recent thread that used a 16F628 to do the same thing. I.E. take two 4 bit numbers and display them on a dual hex display. Mike.

21st February 2008, 06:17 AM	(permalink)
blueroomelectronics	If you're lucky you might be able to score a handful of TIL311 displays off eBay. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com Last edited by blueroomelectronics; 21st February 2008 at 06:23 AM.

21st February 2008, 08:51 AM	(permalink)
Torben	All the ones I can find so far seem to be either out of production or maybe overkill. I think the ICM7212 can do what you want (but I've only take a quick look at the datasheet)--but if you need only one digit, the 40-pin count and ~$6/unit price (at DigiKey) might be a problem. Maybe a sample? Torben

21st February 2008, 12:32 PM	(permalink)
on1aag	Hi Len, Avago still has some but actually getting them might be an entirely different ballgame. http://www.avagotech.com/products/pa...lel_interface/ on1aag.

21st February 2008, 04:05 PM	(permalink)
Papabravo	Max6954 Icm7218 __________________ We never have time to do it right; but we always have time to do it over.

21st February 2008, 08:28 PM	(permalink)
Mike, K8LH	Would something like this work? It outputs '0' through '9', 'A', 'b', 'C', 'd', 'E', and 'F' characters. This is pretty much a finished PIC project (except I think we might have added a pull-down resistor on the base of the 2nd transistor). The code is posted further down in the first page of the following thread; dual 7-segment display controller Regards, Mike Last edited by Mike, K8LH; 21st February 2008 at 08:31 PM.

22nd February 2008, 05:17 AM	(permalink)
Dean Huster	There are 2 or 3 CMOS D/Ds that output hex. The older 9368 was another wonderful one and used constant current outputs so that you didn't need current limiting resistors. The TIL311, even back when they were more easily available, would usually set you back about $10 or more EACH! Dean __________________ Dean Huster, Electronics Curmudgeon Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines). R.I.P.

23rd February 2008, 11:45 AM	(permalink)
Hero999	Why not use good old fashioned CMOS combinational logic? It's pretty much your only solution if you don't want to program anything or spend loads of money on a specialised display. EDIT: What about the DM9368 or the MC14495? __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez

23rd February 2008, 04:40 PM	(permalink)
blueroomelectronics	There you go, like Hero999 said the MC14495 should be perfect. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

24th February 2008, 12:59 AM	(permalink)
Mike, K8LH	Is there another part number? Just tried searching for MC14495 on Jameco, Digikey, and Mouser and none of them turned up a product match.

24th February 2008, 03:31 AM	(permalink)
blueroomelectronics	Probably been discontinued for years. Seems some TTL & CMOS chips are becoming harder to find. That said, your 16F628A solution is probably cheaper too. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

24th February 2008, 08:36 AM	(permalink)
ljcox	Thanks for the responses. A PIC solution would be perfect if I was doing it myself. The whole system could be done by a PIC with a few sundry components around it. But the op I'm helping has very limited electronics knowledge and no PIC knowledge. So the learning curve for him would be very steep. At the moment, I have suggested a decimal (BCD) solution in lieu of the hex one. He initially rejected the BCD one but I think his reasoning is flawed. __________________ Len