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LM3435: I2C Operation during LM3435 Disabled with EN pin

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Replies: 4

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Part Number: LM3435

[ LM3435 ] I2C Operation during LM3435 Disabled with EN pin

Hi,

As my understanding, the I2C function block of LM3435 is suspended during LM3435 is in SHUTDOWN mode with EN = Low.
Is that true?

My customer would like to turn on and off LED with register information is maintained.
In order to support this, I have two ideas.

1: Using RCTRL, GCTRL, BCTRL pins to control output channels

2: Setting LED current registers to zero through I2C

Do you have any other ideas to support customer system configuration?

Thank you for your support in advance.
Regards,
Ken

  • Hi Ken,

    I am sorry for my late reply due to business travel and schedule.

    LM3435 shutdown disabled I2C.
    If your customer wants no light output, I would suggest to pull all controls, i.e. RCTRL, GCTRL and BCTRL to logic "0" (ground).

    Thank you!

    Best Regards,

    Issac Hsu <issac.hsu@ti.com>

    Lighting Power Products, PSIL, APP

  • In reply to Issac Hsu:

    Hi Issac,

    Thank you for your support!
    Let me ask one more quick question.

    We have a similar LED driver, LM3549. With this LM3549, when EN is low, I2C is also disabled.
    Correct?

    Thanks,
    Ken

  • In reply to Kenichiro:

    Hi Ken,

    I am sorry that I don't know if LM3549 has its I2C disabled while EN is low.
    LM3549 was designed by another group. I don't have enough information on their designs.

    Thank you!

    Best Regards,

    Issac Hsu <issac.hsu@ti.com>

    Lighting Power Products, PSIL, APP

  • In reply to Issac Hsu:

    Issac, Thank you, I see.

    I would open new thread!

    Regards,
    Ken 

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