The difference count always is greater than 250

[Anonymous]

Hi guys,

   

I use CY8CMBR3116, when setting the Thresholds for the button, The difference count always is greater than 250, no matter the Sensitivity Parameter is 100 fF or 400 fF, how to adjust the parameter to make the difference counts less than 250?

   

Here is the pictures, and description from User Guide.

   

If the difference count is greater than 255, it will be truncated to 255. In this case, threshold parameters
cannot be set properly. Increase the sensitivity parameter value until the difference counts is less than 255.
Ensure the SNR is greater than 5:1 after changing the sensitivity parameter value by following the procedure
explained in section 6.2.1

[Anonymous]

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The University of Edinburgh 

[Anonymous]

美国大学毕业证+认证Q微信181144918办理美国俄亥俄大学毕业证成绩单学历认证使馆认证文凭
Ohio University      
美国大学毕业证+认证Q微信181144918办理美国俄亥俄大学毕业证成绩单学历认证使馆认证文凭
Ohio University      

[Yuva]

Hi,

   

The 400 pF is the lowest sensitivity which can be achieved with this device. Let us know how you are testing the device and the overlay used. If you add more finger capacitance then there is be shoot in the rawcount (gets saturated). I would suggest you to reduce the finger capacitance (such increase overlay thickness) since this is a smartsense device.

       

Thanks

   

Yuva