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Input analog signal (negative)

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Mr HG

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Hello,

I am working on a project using STM32 microcontroller.

According the datasheet of the microcontroller STM32F10 and Fio std board, the input signal (in C3 for example) must be between 0 and 3.3V. It is normal that is -163mV (signal which came from a pressure sensor) ?? It can damage the microcontroller ??

Thank you :)
 
hi HG,

On PIC/MCU's the inputs have clamp diodes to +V and 0V on their input pins, so I would say -0.163V will not damage the pin input.

You should be able to find on the d/s, a reference note regarding diodes on the STM32F10

E

EDIT: Extract from d/s
 

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Won't damage the input, but will not read the value correctly; likely will read it as 0000
 
Perhaps you could add a known DC offset voltage to the pressure signal so that the MCU input is always positive?
 
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