I have a question about ADuM5412. What are electrical specifications (Vih, Vil, input current, any pull-up or pull-down) for PDIS input pin? I just don't understand if PDIS input powered from VDD1 or VDDP.
Anton: The electrical specs (Vih, Vil, input current) for PDIS are in the DC electrical specs table 6 shown below. The PDIS has a pull-down internally, but a pull up or pull down resistor would be good if in an electrically noisy environment. PDIS is normally powered from VDDP, which for most applications VDD1 is connected to VDDP.
I don't understand. Table 6 shows that Vih = 0.7 * VDD1 and you say that "PDIS is normally powered from VDDP". What do you mean "normally powered"? VDD1 is independent of VDDP and operates between 1.7 V and 5.5 V. That is I can connect VDDP to 5V and VDD1 to any voltage from (1.7...5.5)V. Is that correct?