I have a question regarding the STM32L083CZT6 microcontroller. I have designed a custom board using this microcontroller, but it's not working!! Do you have any tips?

AHamz.2 · ‎2022-06-22

I have tested the microcontroller with different boards and all have the same problem.

I have noticed that the voltage across the NRST is 0V, which I think means that the microcontroller is damaged (There is no short circuit in the system).

I have connected the microcontroller to the PC through a serial wire debugger (using STLINK-V3MINI) and it says MC not found.

I have designed a custom board using STM32F4 before and I didn't have a problem before.

Do you have any tips to find the problem?

Thanks

Here is the Circuit design

AHamz.2 · ‎2022-06-23

You are right, I didn't connect the STM32 to the target voltage because it didn't make a difference in the past.

Now, I have just connected it, but still the same error

AHamz.2 · ‎2022-06-23

When I measure the voltage across the NRST and the ground, it is 0 V

Andrew Neil · ‎2022-06-23

@AHamz.2 "I have just connected the VDDA/VSSA as well as the VDD_USB"

and you've probed at the device pins to ensure that all the supply pins (both VDD and GND) are at the correct levels?

AHamz.2 · ‎2022-06-23

Yes, they are