| ??? 05/20/05 06:22 Read: times |
#93627 - A bit vague Responding to: ???'s previous message |
James Krushlucki said:
Hi, I am having a problem with my 89C2051 circuit and cool temperatures. When temperatures close to freezing ocurr the unit doesn't work. Are you sure it's (just) temperature that's your problem? Could it (also) be humidity/condensation? What exactly do you mean by, "doesn't work?" Describe exactly what does & does not happen. It is a simple signal generator circuit that flashes an led before it breaks into the main code. Different people have different ideas as to what constitutes "simple" You need to post a full schematic. Are you sure that there's nothing external to your circuit that's causing this; eg, power supply or batteries? I first suspected the crystal oscillator but upon checking the datasheet its operating temperature doesn't seem to be the issue. Have you checked that it actually is working? Even though it's within spec, other factors in your circuit may be affecting it - just one example of why we need to see a schematic. |
| Topic | Author | Date |
| Temperature and 89C2051 | 01/01/70 00:00 | |
| Chip Grade? | 01/01/70 00:00 | |
| A bit vague | 01/01/70 00:00 | |
| oscillator? | 01/01/70 00:00 | |
| Built-in Pierce oscillators ARE reliable | 01/01/70 00:00 | |
| Freeze spray | 01/01/70 00:00 | |
| Overheated parts, too hot soldering? | 01/01/70 00:00 | |
| I have my doubts | 01/01/70 00:00 | |
| What about this? | 01/01/70 00:00 | |
| has happened | 01/01/70 00:00 | |
| Re: has happened | 01/01/70 00:00 | |
| Microwave oven | 01/01/70 00:00 | |
| not microwave, but toaster oven | 01/01/70 00:00 | |
| Thanks for replies | 01/01/70 00:00 | |
| How about this | 01/01/70 00:00 | |
| Wait a minute... | 01/01/70 00:00 | |
| Improvements | 01/01/70 00:00 | |
| resist | 01/01/70 00:00 | |
| Quartzes, etch resist | 01/01/70 00:00 | |
| Quartz Crystals | 01/01/70 00:00 | |
| Quartz crystals | 01/01/70 00:00 | |
no problem | 01/01/70 00:00 | |
| Maybe! | 01/01/70 00:00 | |
| Maybe! | 01/01/70 00:00 | |
| LED temperature rating? | 01/01/70 00:00 |