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LP8860-Q1: How to turn off the LED

Part Number: LP8860-Q1

Hi team,

Please tell me the way to turn off the LED.

In the display mode, I think that I can stop using the VDDIO / EN pin, but what the best way to stop only one channel in the cluster mode?

I think that  there are the way PWM input as 0% duty, setting the brightness setting register to 0%, and so on.

Best regards,

Tomoaki Yoshida

  • Hi Yoshida-san,

    Turning off individual LED string on display mode is not supported. You will need to use cluster mode and control the clusterX brightness register to 0% to turn off that string.

    Using VDDIO/EN to turn off LEDs are not recommended at any modes as this will disable boost as well. Boost ramp up time will take 50~100ms depending on register settings, which will prevent fast LED on/off capability.

    PWM input and brightness register for Display/Cluster 1 will be applied to all LED channels on display mode, and cluster 1 channel on cluster mode.

    Hope this helps,

  • Hi Sung-san,

    Thank you for your support.

    Then, should I set the brightness register to 0% when turning off all the LEDs in the display mode?

    Or should I input 0% duty PWM input?

    Best regards,

    Tomoaki Yoshida

  • Hi Yoshida-san,

    On cluster mode, you need to use brightness registers for each string brightness control.

    On display mode, brightness input will depend on BRT_MODE[1:0] option to select input sources. You can use either PWM input(BRT_MODE = 00b) or brightness register(BRT_MODE = 10b) to control brightness

    Hope this helps,