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LP8556 / adaptive control

K.Yaita
Guru 29720 points
Other Parts Discussed in Thread: LP8556

Hi Team,

I would like to ask two questions about LP8556.

1)
The datasheet page.14 shows "Only LED strings that are enabled are monitored and PS_MODE field determines which LED strings are enabled." as the following.




If I disable LED strings by LED_EN (16h, D5:D0) instead of PS_MODE(A5h, D6:D4), could I also disable LED strings?
I believe it but would like to confirm just in case.

2)
If an application require 2 strings only, does PS_MODE[2:0] should be "100"?

Best Regards,
Yaita / Japan disty

  • 0
    TI__Expert 4565 points
    Hi,

    LED_EN and PS_MODE settings are AND'ed in terms of string enable, so you can use either one to just enable/disable each LED string, but PS_MODE decides phase shift operation depending on string count enabled.
    LED_EN decides which LED strings are enabled. With the information from both registers, LED phase shift can work correctly.
    In order to use 2 strings only, LED_EN[5:0] = 000011(LED ch 0 and 1 enabled), and PS_MODE[2:0] = 100 can be used.
    Hope this helps,