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

FHopp.1
Associate III

‎2021-02-03 3:27 AM

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?

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11 REPLIES 11
Uwe Bonnes
Principal III

‎2021-02-03 5:15 AM

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

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FHopp.1
Associate III
In response to Uwe Bonnes

‎2021-02-05 3:17 PM

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

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