Using NRST for system reset through hardware

[terence-b]

Posted on March 30, 2013 at 19:25

Hi

I would like to apply an automatic system reset in case a particular condition in my system is met. I already know how to apply a system reset through software. Now I want also to do it via hardware. If If I pull pin NRST high, will it have the same effect as when I press push button B2?Thanks,Terence

[Tesla DeLorean]

Posted on March 30, 2013 at 22:05

No, you'd want a pull up to hold in the normally high state, and then drive it LOW using an OD driver to reset it. You should not drive this pin high with a PP driver.

[terence-b]

Posted on March 31, 2013 at 23:14

Thanks for your reply; but can you please explain more clearly, as I cannot understand the terms OD and PP driver.

Thanks in advance Terence

[Tesla DeLorean]

Posted on April 01, 2013 at 02:49

OD - Open Drain

http://en.wikipedia.org/wiki/Open_collector

PP - Push-Pull

http://en.wikipedia.org/wiki/Push%E2%80%93pull_output

http://digital.ni.com/public.nsf/allkb/D9B4018C3E540CE4862570F30068C0DB