| 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 |
| Topic | Author | Date |
| 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 |



