Unboxing and review of NUCLEO-F722ZET6 part 4 (the board was burned by me)

12738

Unboxing and review of NUCLEO-F722ZET6 part 4 (the board was burned by me) [Copy link]

 

To be honest, this should be the first board that died in my hands. The weather was sunny and I was about to debug the parameters of the motor driver. After uploading the results several times, it suddenly went out. Then I touched the board and felt that the chip had no temperature, but there was a place on the St link (the circle in the picture below) that was very, very hot.

The code seems to be fine, because it has run normally for several times. It suddenly stopped working the last time it ran. I don't know what the problem is, and I don't think I can fix it.

There is nothing much in the code, just a PWM output, an OLED driver, an ADC, and a Hall acquisition.

It uses the Hall sensor interface of the timer to collect the speed of the motor, and then compares it with the knob potentiometer signal collected by ADC, and then uses PWM output signal to the electric regulator to control the rotation of the motor, and then uses OLED to display the potentiometer signal and the measured speed.

It's too awful......

lugl4313820

If you are sure that there is no human damage, you can apply for after-sales service.

landeng1986

lugl4313820 posted on 2023-10-27 07:42 If you are sure that there is no human damage, you can apply for after-sales service.

Where to apply?

hjl2832

This U3 is an LDO at first glance. If it generates severe heat, then there must be a short circuit in the circuit behind it. The current is too large and causes heat. You can use a multimeter to measure the resistance of the output voltage (usually 3.3V) to the ground, and slowly find out the short circuit problem (if the chip is burned out, replace the chip)

wangerxian

Is it possible that the motor current is fed into the development board through the Hall?

吾妻思萌

Yours is more valuable. Please give your steps in detail to the other party's system engineer. Maybe they can find a reliability bug.

freebsder

Manual welder

12738

lugl4313820 posted on 2023-10-27 07:42 If you are sure that there is no human damage, you can apply for after-sales service.

Can I also apply for after-sales service for the boards that are returned for evaluation?

12738

hjl2832 posted on 2023-10-27 08:24 This U3 is an LDO at first glance. If it is seriously hot, then there must be a short circuit in the subsequent circuit. The current is too large to cause heating. You can use a multimeter to measure it...

Come back and measure

12738

wangerxian posted on 2023-10-27 09:12 Is it possible that the motor current is poured into the development board through the Hall?

This is impossible. The Hall power supply and the motor drive power supply are separate.

12738

Azuma Simeng posted on 2023-10-27 11:38 Yours is more valuable. Please give your steps in detail to the other party's system engineer. Maybe they have found a reliability bug.

How to contact them?

12738

freebsder posted on 2023-10-27 18:00 Manual welding worker

I removed a capacitor and replaced it but it didn't fix it

lugl4313820

12738 Published on 2023-10-28 08:19 Can I also apply for after-sales service for the boards that are returned for evaluation?

I don’t understand then. If it is a new board, you can apply for another one.

吾妻思萌

Azuma Simeng posted on 2023-10-27 11:38 Yours is more valuable. Please give your detailed steps to the other party's system engineer. Maybe they have found a reliability bug.

How to contact them?

I told the management that they have a connection with the manufacturer. The management of the forum is great.

数码小叶

It burned before, and I couldn't touch it with my hands, it was very hot, and then I replaced the power chip and it was fixed.

freebsder

12738 posted on 2023-10-28 08:21 I removed a capacitor and replaced it but it didn't fix it

If you have a fever, it is unlikely to be saveable.