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How to use the trig signal sync LED of LP55231?

Other Parts Discussed in Thread: LP55231

hi all 

請問一下 ,依照LP55231 公板的測試 控制 PWM可以調整亮度

如果我有一個camera exposure signal  ,當camera 開始曝光的時候, exposure signal pull high 

曝光結束pull low ,

如果LED 開始亮要同步 camera exposure signal ,

(0)有機會做到嗎?

(1)是要將 camera exposure signal 接到 LP55231 INT pin嗎?

(2)是要將 camera exposure signal 接到 LP55231 TRIG pin嗎?

(3) 電路上有建議怎麼接嗎?

Thanks