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PICList Thread
'dot matrix led driver'
1997\02\05@164825 by Philippe TECHER

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On Wed, 5 Feb 1997, Scott wrote:

>I would like to drive (4 (or more)) 5x7 dot matrix type LED displays using
>a PIC.  All I've ever done before are 7 segment which seem relatively easy
>using latching decoders, etc.  I'd like to be able to update the display
>(visually) at least once per second (not a clock but I need to display
>information that could change once every second).

Try the SAA1064 chip, it's a 7 Segment driver with an I2C bus interface.
SAA1064 can drive 4 display which are multiplexed. In addition, there is
possibility to adjust luminosity by simply setting a register (there is
8 value to adjust led current). If you need more than 4 displays, you can
add another SAA1064 on the I2C bus and that's all.

Regards,
       Philippe (spam_OUTP.TECHERTakeThisOuTspaminsat.com)

1997\02\05@195348 by Tony Matthews

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Philippe TECHER wrote:
>
> On Wed, 5 Feb 1997, Scott wrote:
>
> >I would like to drive (4 (or more)) 5x7 dot matrix type LED displays using
> >a PIC.  All I've ever done before are 7 segment which seem relatively easy
> >using latching decoders, etc.  I'd like to be able to update the display
> >(visually) at least once per second (not a clock but I need to display
> >information that could change once every second).
>
> Try the SAA1064 chip, it's a 7 Segment driver with an I2C bus interface.
> SAA1064 can drive 4 display which are multiplexed. In addition, there is
> possibility to adjust luminosity by simply setting a register (there is
> 8 value to adjust led current). If you need more than 4 displays, you can
> add another SAA1064 on the I2C bus and that's all.
>
> Regards,
>         Philippe (.....P.TECHERKILLspamspam@spam@insat.com)
Try using portb buffered if you need the current as row drivers and
shift out via the a port to N (serial in parallell out) shift registers
also buffered. Tony M.

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