STM32F446 - STM32U5A5 I2C Problem?

inancmert · ‎2025-08-19

Hello,

I’m using a CAT24C32-D EEPROM. It works on our STM32F446-based PCB, but I can’t get it to work on our STM32U5A5-based PCB. I’m encountering both write and read errors. I’m using the same driver/library on both MCUs, and the hardware is identical except for the MCU itself.

What could be causing this? Why am I seeing these issues on the STM32U5A5 while the STM32F446 works fine? Any help would be appreciated.

TDK · ‎2025-08-19

You probably have a code bug. You should debug your program to find the source of the issue. Consider using a logic analyzer on the SDA and SCL lines to confirm what is happening on the bus.

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Saket_Om · ‎2025-08-20

Hello @inancmert

Any update on this thread?

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Saket_Om