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My first prototype used a ST M24LR-Discovery board where some traces were cut and the M24LR was connected to a Arduino Uno. This was an advanturous construction and not very solid. So I decided to use a ST X-NUCLEO-NFC02A1(https://www.st.com/content/st_com/en/products/ecosystems/stm32-open-development-environment/stm32-nucleo-expansion-board… ) which can be stacked on an Arduino.   Unfortunatelly on this board ST connected the IOREF pin directly to the 3.3V rail:   On the Ar ...