The following shows the diagram for a sensing and filtering input of a break wire alarm. The logic input is held low by the break wire and goes high once the wire is broken. The triggering voltage for the logic high is around 6V. R2 needs to be very high ( min 1M ) to minimise the current consumption, the R1 makes a low pass filter combined with C1. Once the wire is broken, the voltage on C1 needs to be as high as possible ( over VT+ 6v) to maximise reliability. Considering TVS has 1uA leakage, how would you choose R1 and R2?
IC is CD4093BE with Schmitt trigger.
Kindest regards
IC is CD4093BE with Schmitt trigger.
Kindest regards