PSoC5LP Regarding CapSense CSD Auto tuning (Smart Sense) parameters

MiNe_85951 · ‎Feb 03, 2019

Hi,

We are designing multiple CAPS buttons with PSoC 5LP.
When auto tuning was performed, only one button is set to be too sensitive than other buttons.

Cp is lower than other buttons because buttons with too high sensitivity are in the vicinity of the device.

And yet,

Resolution of one button: 16 bits
Resolution of other buttons: 13 to 14 bits

Why is such parameter setting done?

Is it correct to change the above "Sensitivity" parameter and adjust it?

ShanmathiN_06 · ‎Feb 04, 2019

Hi,

I assume that by design (hardware), certain sensors are more sensitive than others.

If the tuning is selected as auto, then the resolution is set for each sensor depending on the sensitivity parameter set in the CapSense customizer GUI.

So, answering to your question, yes, you are correct. You need to adjust the sensitivity according to the finger capacitance.

In other words, if you desire highly sensitive sensors (high resolution), then set the sensitivity value to a lower value and vice-versa.

You could refer to the CapSense component datasheet for more details on the sensitivity parameter. (https://www.cypress.com/documentation/component-datasheets/psoc-3psoc-5lp-capacitive-sensing-capsens... )

I hope this helps.

Thanks,

Shanmathi

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PSoC5LP Regarding CapSense CSD Auto tuning (Smart Sense) parameters

PSoC5LP Regarding CapSense CSD Auto tuning (Smart Sense) parameters

Re: PSoC5LP Regarding CapSense CSD Auto tuning (Smart Sense) parameters