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Pull down Analog Input of Fury


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I try to apply analog input to special condition (brake pressure sensor and DBW safety condition). 
I need to create possibility fault protection by Virtual Aux, ex An volt 1 < 0.5  or An volt 1 > 4.5.
I test the condition by putting  an on-off switch in line of An volt 1.
Noticeably, after cut off the switch of An volt 1, voltage of An volt 1 swings so long time and not below than 0.5.

I wound like to ask your help about external pull down resistor.
Is 100K or 1 M ohm ok for Fury without trouble to ECU and the sensor?
I knows output impedance of the brake sensor but i don't known input impedance of Analog channels.


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