Several causes of single chip microcomputer burning out

1. The power supply voltage is too high. Generally speaking, a little higher than 5V will not burn out.

2. The power supply is reversed. This kind of situation often occurs when doing experiments on the universal board or bread board, so you must check whether the polarity of the power supply is reversed before connecting the power supply.

3. A brother said that the current is too large, but it is actually because of reverse connection or over-high voltage that the current is too large. If it is connected correctly, there will be no excessive current. For example, the single chip microcomputer is connected to a 5V8MA DC power supply and a 5V2A DC power supply. As long as you connect it correctly, the single chip microcomputer can work normally, and the 5V2A power supply will not burn out the single chip microcomputer.

4. When the load is loaded, if the working current of the load is large, there should be a corresponding driving circuit instead of being directly connected to the single chip microcomputer.

5. The last possibility is static electricity, and this possibility cannot be ignored. Static electricity is easily generated in a dry environment, especially in winter in the north. First, the weather is dry, and second, the clothes you wear are mostly wool, so your body will generate static electricity. But now the anti-static ability of many single-chip computers has improved a lot.