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Active high signal

Discussion in 'Microcontrollers, Programming and IoT' started by Rajinder, Nov 6, 2019.

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  1. Rajinder


    Jan 30, 2016
    Hi all,
    I have an active high signal on an IC. This puts the IC into shut down mode. It is connected to an I/O line of a PIC.
    Can i connect the shut down pin to OV via a 10K pull down resistor, this makes the IC active. Then output a logic 1 from the PIC to enable shut down i.e. making it high Does that seem correct?
    Thanks in advance
  2. Alec_t


    Jul 7, 2015
    That should work.
  3. Nanren888


    Nov 8, 2015
    What are the positive power supplies on the PIC and the IC?
    Are they on the same board? Sharing the same negative rail?
  4. Rajinder


    Jan 30, 2016
    Yes, they share the same 3V3 line and OV.
  5. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    You'll have to consider the startup phase of the PIC: does it output the correct signal during startup (boot) when the software has not not yet completely initialized the prot pins (direction, level)? If the defualt state of the I/O pin during startup fits into the behaviour of your circuit, then you are set. Otherwise you'd have to find a way to guarantee correct behaviour during that phase.
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