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how to use the trig of LP55231 and sync the LED Brightness

Other Parts Discussed in Thread: LP55231

hi all 

1.如下圖,黃色是camera strobe 訊號, 紅色為LED 訊號

   我將LP55231 的Trig 接上strobe(120hz) ,但出來還是沒有LED 紅色訊號同步

   請問一下,是要再做甚麼設定嗎?

2. 想問說LP55231 的INT pin 跟 Trig  這兩根的定義是甚麼? 怎麼用?

    感覺這兩根很像.可以解釋一下嗎?

Thanks