Capsense as a capacitance to digital converter

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Dirk_6716
Level 2
Level 2
10 sign-ins 10 replies posted 10 questions asked

I was wondering if I could use capsense as a high resolution capacitance to digital converter.

The range of the measurements would be below 45 pF, but I would need a measurement resolution of approximately 1fF.

Is it possible to achieve such a resolution with capsense? If not, what kind of resolution/range can I achieve?

1 Solution
LinglingG_46
Moderator
Moderator
Moderator
500 solutions authored 1000 replies posted 10 questions asked

If you use the component function: Enable self-test library.

pastedImage_2.png

You can get the capacitance in the pin :

*  Component configuration does not influence measurement. It is done with the following

*  parameter settings:

*  - Modulator clock frequency - as high as possible

*  - Sense clock source - Direct

*  - IDAC sensing configuration - IDAC sourcing

*  - Compensation IDAC - Disabled

*  - Resolution - 10 bits

And, you only can get the resolution of approximately 1pf, not 1fF.

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1 Reply
LinglingG_46
Moderator
Moderator
Moderator
500 solutions authored 1000 replies posted 10 questions asked

If you use the component function: Enable self-test library.

pastedImage_2.png

You can get the capacitance in the pin :

*  Component configuration does not influence measurement. It is done with the following

*  parameter settings:

*  - Modulator clock frequency - as high as possible

*  - Sense clock source - Direct

*  - IDAC sensing configuration - IDAC sourcing

*  - Compensation IDAC - Disabled

*  - Resolution - 10 bits

And, you only can get the resolution of approximately 1pf, not 1fF.