Check the chip model, which is printed on the back of the chip.2 Go to ic37 and other websites to find the chip information.3 Find the corresponding pin, there is a point in the first pin position, and then count counterclockwise, 2,34 corresponding to the pin and data, according to the function of each pin, and then decide if to use the chip.
First confirm the chip model, the corresponding model to the official find datasheet, the above is very clear, pin role, maximum voltage, how to use and so on.