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LM3492 COMM pin 使用問題

Other Parts Discussed in Thread: LM3492

依照LM3492 spec上, 我想使用COMM pin取得IOUT的电压状况. 电路上的Rcomm阻值使用52.3K欧姆, Vcc为12V. 

我在DIM1/CLK pin 输入clk讯号, 量测COMM pin的讯号始终为高电位, 无法得到下图的讯号. 

我也依照spec 章节8.5.2. 在EN pin接上GND, DIM1/CLK pin 输入clk讯号, 讯号变为始终低电位. 请问该如何使用COMM pin读取IOUT是否为overvoltage/undervoltage的bit pattern