Have you used the '7219. I read the datasheet and thought Yes! this is
just what I want to drive one of those little 8 digit "bubble" display
that the older members of this list may remember in LED calculators.
(pass my walking stick, it's over by my pensioners bus pass).

I got it to work, eventually but it was difficult. In the end I had
to run it at 4V - any higher and the internal oscillator would stop
and freeze the display. In a moment of doubt, I actually thought there
was a bug in my code :-)

Got it to work, and it now has pride of place in a microsecond resolution
stopwatch using a 16c84. Code available on request - but I'm not very
proud of it

Pete

..............................................................................
. Never trust a man who, when left alone in ....... Pete Lynch               .
. a room with a tea cosy, doesn't try it on ....... Marlow, England          .
..........Billy Connolly. ......................... pic@beowulf.demon.co.uk ..


On Thu, 16 Jul 1998, Steve Lawther wrote:

>      Ali,
>
>      So its 24 off 7 seg + d.p displays?
>
>      Seems a job for 3 off MAX7129 (I think that's the number) three
> wire
>      bus to 8 x 7 seg + d.p displays driver controller or for 2 off
> Texas
>      Inst. TLC5920 16x8bit LED driver controller.
>
>      As for availability - both devices are in production, but I
> remember a
>      while back people has problems getting the maxim device quickly,
> and
>      I've only learnt about the TI device this week. The TI data says it
>
>      has been in production from nov '97 at least.
>
>      Hope it helps,
>
>                 Steve Lawther
>
>
>
> ______________________________ Reply Separator
> _________________________________
> Subject: LED Display driving
> Author:  Ali Haydar GOKTOGAN [SMTP:ali@DYNAMITE.COM.AU]  at UKExchange
> Date:    16/07/98 15:46
>
>
> Hi,
>
> In a PIC based project I need to drive 3 groups of 8 digits 7+1
> segment (including decimal point) LED displays.
>
> Any suggession will be appreciated..
>
> Thanks...
>