| ??? 08/03/06 15:58 Read: times |
#121623 - Statistically or not Responding to: ???'s previous message |
Some faults have a random nature, others do not. In general software bugs will always show up in the same circumstances because code execution is predictable. If anyone every writes any bug free code, it wont fail unpredictably.
Hardware failures usually contain an unpredicatable element, and the MTTF of a design can be estimated from known failure rates. The PCB I'm currently working on has over 3100 solder joints, and we will be making over 300 per year. If the soldering yield is only 99.99993%, there will be a 50:50 chance of getting a bad board. Our assembly house expects us to design boards where every net is testable, so every net has an NRE cost. |
| Topic | Author | Date |
| reduced pin count multiplexing | 01/01/70 00:00 | |
| with e.g. ST2221A you need 3 pins | 01/01/70 00:00 | |
| No you are right Erik | 01/01/70 00:00 | |
| Well | 01/01/70 00:00 | |
| the wiring is simpler with ST2221A (equivalent) | 01/01/70 00:00 | |
| was it somone named Charlie ... | 01/01/70 00:00 | |
| ??? | 01/01/70 00:00 | |
| check out the appnote.. | 01/01/70 00:00 | |
| Reading the appnote always helps | 01/01/70 00:00 | |
| anyway | 01/01/70 00:00 | |
| who is he? | 01/01/70 00:00 | |
| walking through the description give you a charlie | 01/01/70 00:00 | |
| Small but real benefit | 01/01/70 00:00 | |
| who does your soldering? | 01/01/70 00:00 | |
| A billion dollar assembly house | 01/01/70 00:00 | |
| very small compared to | 01/01/70 00:00 | |
| Statistically or not | 01/01/70 00:00 | |
| I strongly disagree | 01/01/70 00:00 | |
| blah | 01/01/70 00:00 | |
| deterministic vs predictable | 01/01/70 00:00 | |
| and i know | 01/01/70 00:00 | |
| yes, but I am not talking about kettles | 01/01/70 00:00 | |
| just a minute, there, pilgrim ... | 01/01/70 00:00 | |
does not matter when they will happen eventhough ' | 01/01/70 00:00 |