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Driver for common cathode matrix

Abel Valero
Prodigy 230 points
Other Parts Discussed in Thread: TLC5927, TLC59213, TLC5917

Hi all,

I've been working for a long time with common anode RGB LED Matrix displays using different drivers from TI.

Now I'm researching about the common cathode matrix for RGB LED displays. Has Texas Instruments any driver to work in under this configuration?

Thanks and regards

  • 0
    TI__Genius 14890 points

    Abel,

    The TLC59213 can be used with other devices (like the TLC5917 or TLC5927) to create a matrix.  Figure 4 in the TLC59213 datasheet can give some insight as to how the configuration would work.

    Is this the type of source driver you are looking for?

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Prodigy 230 points

    Hi Dick,

    I've been checking the datasheets of these devices but I do not really understand how a RGB Matrix will work in common cathode.

    In common anode is really simple, we have just the MOSFET working as switchs for the common anode rows and the columns (cathodes) connected to the drivers. Do you a small schematic of how do I have to connect it?

    Another question is that the RGB led matrix display is for video and I've seen that the clock of the TLC59213 is only 1 MHz of speed. The drivers that I normally use are above 20 MHz...it will work?

    Thanks very much and regards

  • 0 in reply to Abel Valero
    TI__Genius 14890 points

    Abel,

    I'm not sure if this is what you're looking for.  Does this help?  It shows two sets of LEDs (3 per column, 8 columns) that are used in a matrix.  Additional sets of 8 could be added for the additional 6 channels of the TLC59213.  Each set is enabled by the TLC59213 and when enabled, the outputs of the TLC5917 will turn on whatever channel that are programmed.  In this way, the TLC59213 is operating at 1/8 the speed of the TLC5917.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Prodigy 230 points

    Hi Dick,

    with this schematic I can understand the configuration quite better. So the idea is to use this configuration and to have one TLC59213 and other tlc5917 per colour.

    This way should be easier to build a RGB LED multiplexed matrix.

    Another question is if using the serial colour signal that works in a common anode configuration (for example the one we use for the TLC58293) will work also here for this drivers.

    Thanks a lot Dick

  • 0 in reply to Abel Valero
    TI__Genius 14890 points

    Abel,

    Yes, you can use a different TLC5917 for each color as needed.  The configuration could easily have been set for 2 or 3 or 4 TLC5917 devices running from the same TLC59213.

    I do not understand you question on the serial colour signal.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Prodigy 230 points

    That's perfect, now I understand it perfectly.

    The question regarding the colour signal is that normally we use a TLC5917 per colour channel. I have a scan board that generate CLK, LAT, R, G, B and other signals to display the video signal on the matrix.

    So the question is that if I could use the same signals in a common cathode configuration.

    Thanks a lot

  • 0 in reply to Abel Valero
    TI__Genius 14890 points

    Abel,

    If I understand your application correctly, yes, this will work well.  It is now all about synchronizing the enabled strings with the correct data and based on your previous information, I expect you have that covered well.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Prodigy 230 points

    Sure Dick,

    that's all.

    Thanks very much for your attention and kind regards!