Input analog signal (negative)

Mr HG

New Member

• Feb 14, 2014

• #1

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

 

ericgibbs

Well-Known Member

Most Helpful Member

• Feb 14, 2014

• #2

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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Last edited: Feb 14, 2014

Mr HG

New Member

• Feb 14, 2014

• #3

Thank you very very much

 

MikeMl

Well-Known Member

Most Helpful Member

• Feb 14, 2014

• #4

Won't damage the input, but will not read the value correctly; likely will read it as 0000

 

alec_t

Well-Known Member

Most Helpful Member

• Feb 14, 2014

• #5

Perhaps you could add a known DC offset voltage to the pressure signal so that the MCU input is always positive?

 

ronsimpson

Well-Known Member

Most Helpful Member

• Feb 14, 2014

• #6

You might also look at this:
https://www.electro-tech-online.com...to-possitive-without-vcc.139980/#post-1168070
This is probably the same thing.

 

Mr HG

New Member

• Feb 17, 2014

• #7

I isn't a problem because I solved it by the software

Thank you