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LP5810: LP5810 led driver - internal programme memory

Maxime Charrière
Prodigy 10 points
Part Number: LP5810
Other Parts Discussed in Thread: LP5562

Tool/software:

Hello,

I would like to use the new LP5810 to drive an RGB LED as well as an independent green LED.

However, I need a particular functionality and I am not sure if it is available:

  • I would like to "program" the driver so that at startup, in standalone mode without MCU intervention, we can preprogram the LED output (for example: RGB off / green LED on only). When the system is completely reset, the pre-programmed settings will be available directly.

It seems to have programmable internal memory according to the Texas Instruments search tool, but I am not sure about the possibility of this functionality.

Could you confirm this for me?

Thank you and best regards,

Maxime

  • 0
    TI__Genius 15205 points

    Hi Maxime,

    LP5810 does have the internal pre-programmed setting for the animation setting, but it needs the power from VCC.

    Based on your description, I think the function you need is that when the system startup, the LED will be lighting even if the MCU is not ready yet. Am I right?

    BR, Jared

  • 0 in reply to Jared Zhou
    Prodigy 10 points

    Hi Jared,

    Thanks for your quick reply. Yes, that's exactly it, the LED will be lighting even if the MCU is not ready yet.

    "LP5810 does have the internal pre-programmed setting for the animation setting, but it needs the power from VCC."

    => So it's possible to pre-programme, for example, the switching on of a single LED, which will be ON when the power from VCC is switched on?

    I also saw that the LP5562 has an internal SRAM that could be pre-programmed. Is it the same in LP5810?

    Thanks again,

    Maxime

  • +1 in reply to Maxime Charrière
    TI__Genius 15205 points

    Hi Maxime,

    I got it. For both LP5810 and LP5562, if you want to light a LED when the system start up, both they need a specific command from MCU, then the LED can be lighted up. So, I don't think they can satisfy your requirement.

    Can I know what's your application, end equipment and project schedule? Since we have a new device which can meet your requirements is in the development.

    BR, Jared

  • 0 in reply to Jared Zhou
    Prodigy 10 points

    Hi Jared,

    Okay, I understand. I think it has to do with the “CHIP_EN” command.

    It's not too so important, I think I can do it differently with an green LED directly on the main power supply, and the RGB afterwards with the LP5810, which starts with the MCU afterwards.

    I can't say too much about the application and end equipment. It's simply a status RGB, and a simple green LED for the power supply state on an embedded system. However, we'd like to have the first MVP prototypes up and running by the end of the year.

  • 0 in reply to Maxime Charrière
    TI__Genius 15205 points

    Hi Maxime,

    Got it! Glad to hear that you are still willing to use our device LP5810.

    The new product which can support the above function is expected to be RTM in the end of year. And for the device LP5810, please free to contact me via email (jared-zhou@ti.com) if you have any questions.

    BR, Jared

  • 0 in reply to Jared Zhou
    Prodigy 10 points

    Thank you Jared,

    I really appreciate the quickness and quality of your answers,

    BR, Maxime