[PDM 25] Pull-up Resistor Visibility & Activation
We are configuring an input for Active Low (Ground Switching from a FuelTech ECU). We cannot find a visible option to enable the Pull-up Resistor in the Inputs tab or the General settings. Does the PDM 25 V3 automatically enable the Pull-up resistor when Active Level: Active Low is selected? If not, where is this hardware setting located?
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The inputs on this PDM25 V1 have a built in 200K pull up and a 40K pull down always enabled. This will settle the input voltage at around 1.5V. You can then use a low side signal to trigger it with the active low setting enabled.
If the FT loads down the input to the PDM, you may need to add an additional stronger pull up resistor of around 10K. Alternatively you can use the high side output on the FT if you have any spare.