One 、 problem

STM32 Connected to motor drive ,12v Power supply （ DuPont line used ）, then 32 Your chip burned （ Several times ）

Two 、 Problem finding

This is a passage found on the Internet ：

Before welding STM32 In the case of chip, use a multimeter to measure 5V, And 3.3V The power output is normal . Fortunately, I bought an oscilloscope at home , Let's take the oscilloscope and see why . Connect the oscilloscope and be shocked . It turned out that just when the power was plugged in , And high voltage . The instantaneous fluctuation will disappear . Overjoyed , I thought I found the reason . The power supply is not good , In addition, I changed several power supplies , This is the case . A little confused .
Then go to the bread board power supply to experiment , It is also found that this situation occurs at the moment of insertion . But the bread board power supply has a switch , I turn off the switch , Turn on the switch again, but there is no instantaneous power fluctuation . Press the switch and plug the plug , The results are different , So carefully study the plug structure , Found this DC-005 Each time the plug is plugged in and out, it contacts the positive pole first , Then contact the negative electrode . See light suddenly . Be sure to connect the negative pole first and then the positive pole .
Next, three measures were taken to prevent STM32 Burnout ,1. Add a switch at the positive pole of the power supply .2. stay STM32 And 12V Drive module connection IO Add one to your mouth 1K resistance .3. stay STM32 Add a... At the positive power supply 150mA Self recovery insurance .（ The chip specification should say STM32 Maximum current 150mA）.
And then put STM32 The chip is soldered , Start the test . It never burned again STM32. I don't know which of the above three schemes has worked .

stm32 The power supply is 5V1A, There is no problem with the normal use of DuPont line power supply , But the driver has arrived 12V, Because the current is too large, then the circuit burns back .

summary

The feeling should be that the current bearing capacity of DuPont line is not enough , When supplying power to the drive, it should be replaced with red and black lines , DuPont line can be used for ordinary module power supply . Best in STM32 And 12V Drive module connection IO Add one to your mouth 1K resistance .