MPX5100

[ed1]

While there is nothing about the sensor and the output that leads us to believe the voltage output readings are inaccurate, before we go to market, we'd like to independently verify the sensor output.

We've spent much effort already on conducting an independent validation, but each approach we use, we find a flaw in the approach.

How would one go about independently verifying the voltage output given the pressure input on the sensor? What tools are needed? It seems like we need to know the volume of the sensor chamber. Is this on the data sheet?

Thank you for any insight you may be able to provide.

[reyes]

Hi,

Unfortunately, we do not have any white paper or any other document about how to verify the sensor output.

It is normal to have a small difference between different sensor reading the same pressure, this offset errors are typically caused due to device to device offset variation (trim errors), mechanical stresses (mounting stresses), shifts due to temperature and aging. Performing auto-zero will greatly reduce these errors.

I recommend you to check the Application Note AN1636 “Implementing Auto-Zero for Integrated Pressure Sensors” for more detailed information about this topic: https://www.nxp.com/docs/en/application-note/AN1636.pdf

As a test if you don't know the pressure of the chamber, after the auto-zero calibration process you can use different pressure sensors and all of them should read the same pressure.

Have a great day,
Jose

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[ed1]

Hi Jose,

Thank you for your response. I'm still at a loss as to how to verify the sensor output and what tools and process I would need to do so. If anyone else has ideas and would like to weigh in, please do so. 

It seems like the sensor manufacturer had to do this verification at some point during the sensor development. Having their materials would go a long way toward answering this question.

Again, thank you,

Ed