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STM32 NUCLEO-L476RG OPAMP Output not below 1.4 V

Question asked by Alex Wagner on Mar 26, 2018
Latest reply on Apr 7, 2018 by waclawek.jan

Hey guys,
i am right now working on the Nucleo L476 RG Board. I generated source code with STM32CubeMX (v4.25). I am using the internal opamp in "Follower" mode and reading the output with the on-board adc. VCC is 3.3 V.

 

When applying different voltage levels to the input of the internal opamp i have seen that the opamp output  never goes below 1.4 V even when i directly short the input to GND. Above 1.4 V everything works like expected.

 

Does anyone have a clue what is going wrong/missing in the code to make it work over the full spectrum?

 

Thank you and best regards,

 

Alex

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