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STM32F3 NRST pin slowly pulls low

Question asked by Bence Péceli on May 1, 2018
Latest reply on May 2, 2018 by AvaTar

Hello, I have an STM32F3 built into an application. I managed to upload a very simple code and run it, but something weird is happening. After about 20-30 seconds the mcu turns off. I measured the voltage at the NRST pin and after powering the device it slowly starts to decrease. After about 20-30 seconds it reaches 1.3-1.5 V and the mcu turns off. It keeps decreasing and stops at about 0.8-0.9 V. I desoldered most components, including the reset button, hoping one of them was faulty, but it didnt help. Now this part of the circuit consists of only the mcu NRST pin and a pull up resistor (10k). What could cause such a problem? Thank you in advance

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