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STM32 with SPI 1.8V connected to 3.5V MAX31865 cuases not working communication

FHopp.1
Associate III

I have an 1.8V STM32 and an 3.5V MAX31865 which are connected via SPI, I used 10k Ohms pullups on data line to 3.5V. Now the problem is that communication dosen't work. When I increas STM32 voltage to 3.5 V everything is fine. Is there an limitation in logic high on STM32 side?

11 REPLIES 11
Uwe Bonnes
Principal III

On register level it is possible. Wheter Cube exposes this interface, I do not know.

Yes, that was the reason. If i set down voltage from 3.5 to 3.0 its working