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09/01/05 12:30
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 		 #100410 - Philips chips use reset as an OUTPUT whe
Responding to: ???'s previous message
Laurent Rabatel said:
BTW... an application engineer from our Philips distributor told us that we had to disable the brownout detect function in order to be able to use an external supervisor... and guess what? It's not working any better!

Jan:
Hummm I am would expect that - contrary, I would expect that the brownout ON would help (but again only those who know the internals of the chip could tall for sure)...

My guess is that since the recent Philips chips use reset as an OUTPUT when e.g. the internal puppy bites, the reason for the disable is that if brownout AND the external supervisor did not "agree" one would be fried.

Now, here is another thought: what if using an external super has lead to a "fight" that damaged something in the LPC ?

Erik



List of 75 messages in thread
TopicAuthorDate
LPC900 (932) series how reliable?            01/01/70 00:00      
   LPC reliability.            01/01/70 00:00      
      there was never a problem with reliabil            01/01/70 00:00      
      Power cycling not below 0.20V ?            01/01/70 00:00      
         I do not know this for a fact, but my im            01/01/70 00:00      
         VPOR            01/01/70 00:00      
            POR and other things            01/01/70 00:00      
               That's an absurd behaviour            01/01/70 00:00      
                  Yea.            01/01/70 00:00      
                  Why not an external supervisor.            01/01/70 00:00      
                     use of an external reset            01/01/70 00:00      
                  only an issue for the internal reset            01/01/70 00:00      
                  Exactly            01/01/70 00:00      
                     yes, we understand            01/01/70 00:00      
                        most companies I know have "idiots" to a            01/01/70 00:00      
                        Very good to hear!            01/01/70 00:00      
                           other plans            01/01/70 00:00      
                              rumors            01/01/70 00:00      
                                 its not a rumor anymore !            01/01/70 00:00      
                                    and for those of you that need .1" pin s            01/01/70 00:00      
                                    How about a USB version?            01/01/70 00:00      
            Power Supervisors.            01/01/70 00:00      
               Handling 932 devices            01/01/70 00:00      
                  Could 3V devices have these problems?            01/01/70 00:00      
                     I have used both the LPC and the SILabs            01/01/70 00:00      
                     Reset post-production            01/01/70 00:00      
                        I have no doubt that marketing forced th            01/01/70 00:00      
                     why not the 5V devices?            01/01/70 00:00      
   LPC9xx Reset Conclusion            01/01/70 00:00      
      A very good question!            01/01/70 00:00      
         I have had zero problems, but am, for ot            01/01/70 00:00      
         Our solution            01/01/70 00:00      
            Pinch circuit            01/01/70 00:00      
            Pich Circuit.            01/01/70 00:00      
               Curing the symptoms!            01/01/70 00:00      
                  once more            01/01/70 00:00      
                     How " proper" is proper?            01/01/70 00:00      
                        maybe            01/01/70 00:00      
                           I thought so too            01/01/70 00:00      
               I haven't forgotten..            01/01/70 00:00      
                  We are waiting desperately            01/01/70 00:00      
                     Simple, but current consuming            01/01/70 00:00      
                        Space consuming & Costly.            01/01/70 00:00      
                           Availability...            01/01/70 00:00      
                              Already using in a product.            01/01/70 00:00      
                                 Tomas Stein has more experience with LPC            01/01/70 00:00      
                              Excellent statement!            01/01/70 00:00      
                        Is it foolproof.            01/01/70 00:00      
                           Active low for the duration of reset            01/01/70 00:00      
                              Re: Active low            01/01/70 00:00      
      Problems with LPC922 at start-up            01/01/70 00:00      
         not at all, what they (try to) say is th            01/01/70 00:00      
            Quartz            01/01/70 00:00      
         glitch?            01/01/70 00:00      
            Factory mode            01/01/70 00:00      
               more factory modes            01/01/70 00:00      
                  Factory mode : Perhaps...            01/01/70 00:00      
                     I was just guessing...            01/01/70 00:00      
                        Philips chips use reset as an OUTPUT whe            01/01/70 00:00      
                           reset OUTPUT?            01/01/70 00:00      
                              I did not look and thus I stated " My gu            01/01/70 00:00      
                        It's worth a try...            01/01/70 00:00      
                           It may be an idea to e-mail Bauke Sideri            01/01/70 00:00      
                              No contact available...            01/01/70 00:00      
                                 Their e-mail must have been abused, it u            01/01/70 00:00      
         btw.            01/01/70 00:00      
   Supervisor & Watchdog ?            01/01/70 00:00      
      a watchdog is not needed to ensure a rel            01/01/70 00:00      
         Purchased another 20 Nos of LPC921            01/01/70 00:00      
             Now, if you have trouble getting it, ho            01/01/70 00:00      
               Already tried that...            01/01/70 00:00      
                  Because some app engineer tries to make            01/01/70 00:00      
                     Adding more devices for reliablity            01/01/70 00:00      
                        Where is the connction?            01/01/70 00:00      
                           Sorry!            01/01/70 00:00      

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