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AD采样口串限流电阻问题

Other Parts Discussed in Thread: CONTROLSUITE

controlsuite里F28069的原理图中AD口有限流电阻,F28377D的AD口没串限流电阻,查了一下资料,F28377D的AD口允许输入电流是20mA,请问F28377D怎么选取这个限流电阻?