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Protect the MCU without making hardware changes.

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Wadeva
Associate III

‎2024-09-27 02:44 AM

Hello everyone,

I’m facing an issue described in this link: My STM32 device is overheating and has malfunctioned.

My STM32G070CBT MCU has been damaged, specifically from the PC6 pin, which wasn’t in use. Unfortunately, the pin is connected to another device that is shorted to the chassis, and this is a finished product that has already been released. Here’s what I cannot do:

  • I cannot modify the PCB design.
  • I cannot add protection diodes.
  • I cannot cut the cable.

Given these constraints, is there a way to protect the MCU without hardware changes? For instance, could setting PC6 to pull-down mode or output mode help mitigate the issue?

Thanks!

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Andrew Neil
Evangelist III
In response to Wadeva

‎2024-09-30 01:50 AM - edited ‎2024-09-30 02:26 AM

@Wadeva wrote:

Hello, I’m a bit confused.  

Likewise!

Pulling an unused pin to ground shouldn't cause any problems at all - in fact, it is a common practice to do so!

AndrewNeil_0-1727686155877.png

https://www.st.com/resource/en/application_note/an5096-getting-started-with-stm32g0-series-hardware-development-stmicroelectronics.pdf 

 

The only problem would be when it is configured as an output and driven high.

Or left unconfigured and floating.

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