| ??? 05/24/10 20:11 Read: times |
#176161 - Probably bad design or bad workmanship Responding to: ???'s previous message |
A bad serial cable should not manage to heat the poor little MAX232. The best way to get it hot is probably (as already mentioned) to supply the wrong polarity or having the chip turned 180 degrees. Is it socketed? Or is there any solder problems around the chip? It really helps to have a diode on the power supply line since evaluation boards are not always sent to the most experienced users. And it isn't uncommon that the power adapter gets lost and people pick up whatever they have around.
If your power supply has wrong polarity and there is no diode to protect, then I would have expected more than the MAX232 to get hot. The processor is most definitely not designed to survive reversed polarity. |
| Topic | Author | Date |
| please help | 01/01/70 00:00 | |
| Some answers | 01/01/70 00:00 | |
| not a micro job | 01/01/70 00:00 | |
| two programming suggestions | 01/01/70 00:00 | |
| Inclined to Agree | 01/01/70 00:00 | |
| Probably bad design or bad workmanship | 01/01/70 00:00 | |
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| Books for you to study | 01/01/70 00:00 | |
| making progress | 01/01/70 00:00 | |
| bible time | 01/01/70 00:00 | |
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| 8052.com instruction set pages | 01/01/70 00:00 | |
why not the whole story? | 01/01/70 00:00 |