Continuous Reboot Issue with STM32G070CBT6

[Aditech]

Hello,

We are currently using the STM32G070CBT6 microcontroller in one of our data logger devices, which operates on a three-phase power supply and is used in a transformer application. In our design, the microcontroller triggers a relay, and the relay controls a contactor.

We are facing an issue where the STM32G070CBT6 is continuously rebooting during normal operation, which is affecting the overall functionality and reliability of the product.

For your reference, we have attached the reset circuit schematic used in our design. We kindly request you to review the schematic and help us identify the possible causes of the continuous reboot behavior.

Please let us know if any additional information, measurements, or test data are required from our side to assist in the analysis.

Thank you for your support.

[mƎALLEm]

Hello,

You could be facing EMI or EMC issues. But you forgot to attach the schematics.

Better to attach the complete schematics instead of the reset part.

[TDK]

Read the RCC_CSR register to understand why the chip is resetting. Possibly a power issue. Ensure 0.1 uF cap is on NRST line.

[gbm]

My wild guess: insufficient separation between the relay drive and MCU power supply and/or incorrect PCB routing. Impossible to evaluate without schematic.

[STOne-32]

Dear @Aditech ,

I have seen in few cases, Watchdog is active either by options bytes or by software and not refreshed properly during execution and so reboot the system. 
Hope it helps ,

STOne-32

[Aditech]

 Hello Find the attached reset circuit that we have used.

[gbm]

And what happens if you remove R59? If the behavior doesn't change - see my previous post.

[STOne-32]

And also to remove R4 - 10K resistor .