The TIL311 is a hex display, with a driver circuit able to accept 4 bit
binary data.  Data can be latched.


Pin 1   LED supply voltage (+5V)
Pin 2   Latch data input B (Weight = 2)
Pin 3   Latch data input A (Weight = 1)
Pin 4   Left decimal point cathode (you need a series resistor to
        limit current)
Pin 5   Latch strobe input (High = inputs latched, Low = follow input data)
Pin 7   Common Ground
Pin 8   Blanking input (High = blank display.  You can pulse this input for
        LED intensity control)
Pin 10  Right decimal point cathode (you need a series resistor to limit
        current)
Pin 12  Latch data input D (Weight = 8)
Pin 13  Latch data input C (Weight = 4)
Pin 14  Logic supply voltage,Vcc (+5V)


Hope this helps,

-Randie Ohtsji
rohtsji@glenayre.com




> From elimar@BIGFOOT.COM Wed Sep 10 12:11:52 1997
> Encoding: 110 TEXT
> Date:         Wed, 10 Sep 1997 11:05:13 -0400
> From: "Martin R. Green" <elimar@BIGFOOT.COM>
> Subject:      FW: [OT] 7 Segment LED
> To: PICLIST@MITVMA.MIT.EDU
>
> Correction, when I reread the original post, I realized that I had spouted
> crap, sorry.  The TIL311 was a single digit, 7 segment device as you
> stated, but it did in fact have an on-chip BCD to 7seg decoder/latch.
>
> As I said, I will try to find the specs on this for you.
>
> Martin R. Green
> elimar@bigfoot.com
>
> ----------
> From:   MARTIN Green
> Sent:   Wednesday, September 10, 1997 11:01 AM
> To:     'pic microcontroller discussion list'
> Subject:        RE: [OT] 7 Segment LED
>
> If I remember correctly (and I might not) the TIL311 is a smart LED, with a
> 4 character addressable latch.  I think these devices were actually 15
> segment devices, allowing display of the complete ASCII set.  The logic
> circuits are 5V TTL.  I will check at home to see if I still have info on
> these useful, but way expensive devices.
>
>
> CIAO - Martin R. Green
> elimar@bigfoot.com
>
> ----------
> From:   Jacques Vrey[SMTP:jvrey@IT.NEW.ISCORLTD.CO.ZA]
> Sent:   Wednesday, September 10, 1997 4:30 AM
> To:     PICLIST@mitvma.mit.edu
> Subject:        Re: [OT] 7 Segment LED
>
> >
> > Hi,
> >
> >    Sorry I don't have a diagram for you, but I have a suggestion.
> >
> > Have you tried putting one of them in a breadboard, and using a 3V supply
> > and a 200R resistor to check out the pins. Connect a random pin to ground
> > then connect each pin in turn through the resistor to +3V.
> >
> > These are the possible outcomes.
> >
> > Common cathode, gnd not connected to cathode - no segments light up.
> Connect
> > +ve through resistor to pin and probe for cathode.
> >
> > Common cathode, gnd connected to cathode - lots of segments light up in
> turn
> > (bingo) start writing down pin allocations.
> >
> > Common anode, gnd connected to anode - no segments light up. Connect +ve
> > through resistor to pin and start writing down segmemnts.
> >
> > Common anode, gnd connected to segment - only one segment lights up.
> Connect
> > +ve to pin which lights segments and start writing down pin allocations.
> >
> > There may be some pins which are not connected, or which are bridged
> > together. If you have a meter in series with the 3V supply it's easy to
> see
> > which ones these are.
> >
> > Hope this is some help,
> >
> >                         Keith.
> > ------------------------------------------------------------
> > Keith Dowsett         "Variables won't; constants aren't."
> >
> > E-mail: kdowsett@rpms.ac.uk  or kdowsett@geocities.com
> >
> > WWW: http://kd.rpms.ac.uk/index.htm
> >      http://www.geocities.com/CapeCanaveral/Lab/8979
> >
> >
> Hi there..again
>
> In response..
> That was the first thing I tried and all I managed to locate was the
> dp's.
> This 7seg has a small chip in it that appears to do some decoding as
> each segment actually consists of four individual LED's as such:
>
> +--\/----\/--+   +------------+
> |            | 14|0          0|1
> |  o o o o   |   |            |
> |  o     o   | 13|0          0|2
> |  o     o   |   |      T     |
> |  o o o o   | 12|0     I    0|3
> |  o     o   |   |      L     |
> |  o     o   |   |      3    0|4
> |o o o o o o |   |      1     |
> |            | 10|0     1    0|5
> |   +---+    |   |            |
> |   |IC |    |   |            |
> |   |   |    |   |            |
> |   +---+    |  8|0          0|7
> +-----/\-----+   +------------+
>
> Maybe this will shed some light on the problem.
> Thanks anyway.
> Regards
> Jacques Vrey
> Iscor Steel Profile Products
> Newcastle
> South Africa
> Tel: +27 (0)3431 48759
> jvrey@it.new.iscorltd.co.za
>