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DOUT voltage when not enabled

Kai Rasporich 1 year ago in Master modules / MC4x • updated 10 months ago • 2

Hello,

I am having some trouble with the Parker MC41. I have a display button on another MD4 that enables / disabled the output on Pin 45 (DOUT-HS). I am seeing a proper system voltage of 12.26V when the value is true, however when I set it to false Pin 45 goes to 11.68V. Is this normal behavior? Should I have some sort of diode in there to get the desired on/off I am expecting?

Thank you.

+1
Michael Carlyle 1 year ago

The leakage current for the MC4X's is very high to allow for error checking (open load etc.) If there's no load there - the leakage current will give you almost system voltage.  We had to use the HS+LS outputs for very low current (solid state devices) or use a high side and a low side output with opposite logic connected together (to ground the output when off) if you want to pass use an output to send to another computer system.

Kai Rasporich 10 months ago

Thanks for the information. I'm not able to figure out how to have an independent LS output on the MC41, is it not supported? 

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