Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
09/14/10 05:54
Modified:
  09/14/10 06:29
Read: times


 		 #178554 - Scope time!
Responding to: ???'s previous message
How do you actually "turn off" the power?

You need to get a scope and see what's actually happening when you "turn off" the power:

  • Are there any spikes or glitches on the processor's power pins?
  • How does the supply voltage decay?
  • What happens at the reset pin?

    Probably easiest if you use a Storage scope...

    • List of 81 messages in thread
    TopicAuthorDate
    strange behaviour in serial communication            01/01/70 00:00      
       Slow VCC Decay            01/01/70 00:00      
          Get rid of the crappy R/C reset circuit            01/01/70 00:00      
       try this experiment...            01/01/70 00:00      
          totally irrelevant            01/01/70 00:00      
             thanks all            01/01/70 00:00      
                if you are running 5V ....            01/01/70 00:00      
                   I agree            01/01/70 00:00      
             What's irrelevant is..            01/01/70 00:00      
                Not irrelevant to evaluate before buying            01/01/70 00:00      
                if this refer to my post ....            01/01/70 00:00      
                   I am glad i started such a healthy discussion :)            01/01/70 00:00      
                      not start but restrart            01/01/70 00:00      
                         Will be more threads            01/01/70 00:00      
                   to Gary Peek            01/01/70 00:00      
          I doubt that will help            01/01/70 00:00      
       bad news            01/01/70 00:00      
          time to show ...            01/01/70 00:00      
             Oh My Gosh            01/01/70 00:00      
                I do not know to which extent ...            01/01/70 00:00      
                   A number of short forms are commonly accepted in formal text            01/01/70 00:00      
                      we are getting distracted here            01/01/70 00:00      
                   What I would like to outlaw            01/01/70 00:00      
                SMS? I think not. Just in a hurry to prove...            01/01/70 00:00      
             here is the code again            01/01/70 00:00      
                that code could not possibly produce            01/01/70 00:00      
                   but it is ...            01/01/70 00:00      
                      here are the screenshots from hyperterminal            01/01/70 00:00      
                         Still Seems Like...            01/01/70 00:00      
                         Could Also Be            01/01/70 00:00      
                         By the way...            01/01/70 00:00      
                            good advice and an addendum            01/01/70 00:00      
                               supervisor decoupling            01/01/70 00:00      
                                  But things are quite slow!            01/01/70 00:00      
                                     yes cutting of DC fixed the issue            01/01/70 00:00      
                                        Are you sure?            01/01/70 00:00      
                                        Oh no it hasn't!            01/01/70 00:00      
                                           ok I agree , lets discuss            01/01/70 00:00      
                                              It depends on what your goals are            01/01/70 00:00      
                                              "DNA scope"            01/01/70 00:00      
                                              The Thing Is            01/01/70 00:00      
                                                 Frequent examples            01/01/70 00:00      
       Scope time!            01/01/70 00:00      
          Would this sort of thing be at all helpful?            01/01/70 00:00      
             Quite possibly            01/01/70 00:00      
                I suspect they're all AC-coupled            01/01/70 00:00      
                   AC Coupled -- No Good            01/01/70 00:00      
                      More than DC power decay...            01/01/70 00:00      
                      Isn't there some way of conditioning the input?            01/01/70 00:00      
                         No DC Bandwidth            01/01/70 00:00      
                            No argument there ... but ...            01/01/70 00:00      
                               Do you really think...            01/01/70 00:00      
                                  Certainly, you're right ... however ...            01/01/70 00:00      
                                     Squeezing DC through AC Channel            01/01/70 00:00      
                                        and, for all practical purposes ...            01/01/70 00:00      
                                        How about this ... ???            01/01/70 00:00      
                                           Invert and add to subract the AC??            01/01/70 00:00      
                                              What about using other sampling hardware?            01/01/70 00:00      
                                                 making a scope (sampling or not) is fairly simple            01/01/70 00:00      
                                                    true enough ...            01/01/70 00:00      
                                                       USB modems really nifty            01/01/70 00:00      
                                                          Maybe the USB 'scopes are nifty ...            01/01/70 00:00      
                                                             USB 'scopes'            01/01/70 00:00      
                                                                for observing PSU behavior ...            01/01/70 00:00      
                                                                   making a scope (sampling or not) is fairly simple            01/01/70 00:00      
                                                                      Well, I haven't tried it            01/01/70 00:00      
                                                                         another approach            01/01/70 00:00      
                                                                            Using hardware as built ... as much as possible            01/01/70 00:00      
                                                                               SiLabs C8051F34x            01/01/70 00:00      
                                                                                  Which MCU is used doesn't matter ... yet            01/01/70 00:00      
                                                                                     But it does matter            01/01/70 00:00      
                                                                                        I agree, but ...            01/01/70 00:00      
                                                                            100MHz++ is nice but lots of areas are below 100kHz            01/01/70 00:00      
                                                                               While that works for some ...            01/01/70 00:00      
                                                                                  Different tools good at different times            01/01/70 00:00      
                                                                                     no argument from me            01/01/70 00:00      
                                                                                        For one so insistent on answering the question as asked...            01/01/70 00:00      
                                                                                           This should have been a new thread, eh?            01/01/70 00:00      
                                                                                              Yes!            01/01/70 00:00      
                                                       too new, but            01/01/70 00:00      
                                                    For crude display ...            01/01/70 00:00      

    Back to Subject List