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

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
Bruce Grenade
05/03/07 20:40
Read: 559 times
Mckinney


 
#138582 - Round 3 - Hopefully better
Responding to: Bruce Grenade's previous message
Ok, so lots of changes here based on the information you guys provided.

1) (S-R) latch schematic symbol updated (and more importantly I understand why).
2) As Eric pointed out, power-up is sort of a race condition. Although it's not a big deal in my app, I'm hoping my method would result in an off condition. I'm relying on the RESET input charging up slower than the SET latch. Whatcha think?
3) I've flipped the ON logic to the SET side of the latch. The old circuit I posted was actually from a previous project that used negative on logic.
4) I've removed the option for the microcontroller to force a turn-on. This isn't a feature i want or need. However, I should still be able to drive the latch off by applying a logic zero to FORCEOFF.
5) Similarlly to Michael's circuit, I now have a on\off button press detection and as such should be able to react accordingly (special modes or powering the device off).



Looking for any other ideas or suggestions. I certainly could have misunderstood something so any help is appreciated.

Bruce

List of 53 messages in thread
TopicAuthorDate
Momentary toggle soft switch with flip-flop?      Bruce Grenade      04/26/07 17:36      
   I don't like it.      Lynn Reed      04/26/07 19:58      
      How Bouncy      Bruce Grenade      04/27/07 06:52      
         what good does 'minimum' do you      Erik Malund      04/27/07 08:31      
   Schmidt trigger      Joseph Hebert      04/26/07 20:19      
      Tricky...      Sasha Jevtic      04/26/07 23:52      
         rail to rail bounce      Joseph Hebert      04/27/07 07:05      
      McKinney      Bruce Grenade      04/27/07 06:53      
   4013 FF toggle circuit      Charles Bannister      04/26/07 22:38      
      Values?      Bruce Grenade      04/27/07 06:55      
         Values of R1,R2 &R3? Look at PCB!      Charles Bannister      04/27/07 11:17      
            clocking a FF from an RC?      Andy Neil      04/27/07 11:51      
               Agreed      Bruce Grenade      04/29/07 13:45      
                  Follow the datsheet, that is design      Erik Malund      04/30/07 06:20      
                  Why dismissing the flip-flop?      Kai Klaas      04/30/07 07:02      
                     dismissing the flip-flop?      Erik Malund      04/30/07 07:47      
                        The CD4013 of Bruce's schematic      Kai Klaas      04/30/07 07:57      
                           The CD4013 of Bruce's schematic is shown as a f/f      Erik Malund      04/30/07 08:40      
                              I answered to Bruce...      Kai Klaas      04/30/07 09:07      
                  The circuit shown,,,,      Michael Karas      05/02/07 05:52      
                     Power Consumption      Bruce Grenade      05/02/07 14:08      
   Overlooking the obvious?      Sasha Jevtic      04/26/07 23:44      
      Simpler?      Andy Neil      04/27/07 00:24      
      Keymat      Andy Neil      04/27/07 09:16      
   Why not a hard switch?      Andy Neil      04/27/07 00:19      
      Requirements      Andy Neil      04/27/07 02:44      
      Industrial designers is why      Bruce Grenade      04/27/07 06:57      
         Fair enough!      Andy Neil      04/27/07 08:36      
   Let The Microconroller Decide        Michael Karas      04/27/07 03:27      
      dedicated microcontroller :-)      Jan Waclawek      04/27/07 05:11      
      Interresting no flip-flop      Bruce Grenade      04/27/07 07:04      
   dat is de bounce      Erik Malund      04/27/07 06:12      
   The 4013 needs steep edges      Kai Klaas      04/27/07 11:15      
      caps      Bruce Grenade      05/02/07 14:24      
      A Vauge Suggestion      Neil Kurzman      05/02/07 19:35      
   additional parts      Stefan Kanev      05/02/07 05:52      
      what pin of which chip in what package?      Erik Malund      05/02/07 06:35      
         chip on drawing in generic post      Stefan Kanev      05/02/07 06:44      
            slowig down the bugger is not going to make it clo      Erik Malund      05/02/07 07:46      
   What about this?      Bruce Grenade      05/02/07 14:17      
      what is 'SOFTSW"?      Erik Malund      05/02/07 15:49      
      Seems OK Except...      Michael Karas      05/02/07 16:01      
         nice to find a fellow "drawer of fuctions"      Erik Malund      05/02/07 16:05      
            I find it eaasier to just...      Michael Karas      05/02/07 16:14      
               We appreciate it      Bruce Grenade      05/03/07 18:27      
      Further Analysis....      Michael Karas      05/02/07 16:10      
      Would this work?      Kai Klaas      05/03/07 16:20      
      All comments noted      Bruce Grenade      05/03/07 17:20      
   Round 3 - Hopefully better      Bruce Grenade      05/03/07 20:40      
      Round 4 is the winner      Tomas Stein      05/04/07 11:10      
         Tomas?? Bruce?? Are you a schizo?      Kai Klaas      05/04/07 17:00      
            haha, yes      Bruce Grenade      05/05/07 00:03      
         A bit confusing...        Kai Klaas      05/05/07 08:46      

Back to Subject List