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LP5569: Regarding the method of analog dimming

Kyohei
Expert 1871 points
Part Number: LP5569


Tool/software:

Hi team,

My customer is considering the LP5569.

Since it is used at the sensor input location, it will be used with analog dimming by adjusting the current value instead of PWM control.

Is the following method correct?

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The LP5569 can be used with analog dimming by adjusting the current value instead of PWM control by setting the Chip_en bit in the CONFIG register to LOW,

as described in section 8.3.1.2.3.1 PWM Master Fader on EN/PWM Pin of the datasheet.

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Best regards,

Kyohei

  • +1
    TI__Expert 6600 points

    Hi Kyohei,

    No, set chip_en to low, the LP5569 will stay in standby mode when there is not output. And the PWM master fader is still PWM dimming method.

    Actually, each output of LP5669 supports both PWM dimming and analog dimming. In direct control mode, the output PWM is controlled by the LEDx_PWM register, and the analog output is controlled by the LEDx_CURRENT.

    So, you can set all the LEDx_PWM as 0xFF (100% PWM), then use the LEDx_CURRENT register to do the individual analog dimming.

    Best regards,

    Felix