Active high signal

[Rajinder]

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

 

[Alec_t]

That should work.

 

[Nanren888]

What are the positive power supplies on the PIC and the IC?
Are they on the same board? Sharing the same negative rail?

 

[Rajinder]

Yes, they share the same 3V3 line and OV.

 

[Harald Kapp]

Then output a logic 1 from the PIC to enable shut down i.e. making it high Does that seem correct?

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.