capacitive touch not working in class

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RARA_2227736
Level 2
Level 2

Hi I am using CY8C4014SXI-421,  CY8C4024AZI-S413 controller for capacitive touch application. i am using 4 to 7 mm Class overlay. in this 4 mm is class and 3 mm is light guide for LED.   in the transparent class its working as per the expectation. actually this has to go for mirror. in the  mirror coated area its not working. the coating may less than 0.2mm. actual app its engraved  in the mirror in the capacities touch switch area. could you please help on this.

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1 Solution
VenkataD_41
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hi,

Please note that the mirror coating should be non-conductive. if it is non-conductive, we think 7mm thickness is high for the sensor area that you have. Please attach some images of your board as well as sensors to understand the real situation.

What is the value of SNR you are getting for your sensors? If it is less than 5, you have to manually tune your sensors following the procedure mentioned in section 5.3 of the PSoC 4 and 6 CapSense Design guide.

https://www.cypress.com/file/46081/download

You can use CapSense Tuner to measure the SNR and to tune the sensors. Please refer CapSense component datasheet to see the steps required for Tuning.

Please update the thread if you have any queries.

Thanks

Ganesh

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1 Reply
VenkataD_41
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hi,

Please note that the mirror coating should be non-conductive. if it is non-conductive, we think 7mm thickness is high for the sensor area that you have. Please attach some images of your board as well as sensors to understand the real situation.

What is the value of SNR you are getting for your sensors? If it is less than 5, you have to manually tune your sensors following the procedure mentioned in section 5.3 of the PSoC 4 and 6 CapSense Design guide.

https://www.cypress.com/file/46081/download

You can use CapSense Tuner to measure the SNR and to tune the sensors. Please refer CapSense component datasheet to see the steps required for Tuning.

Please update the thread if you have any queries.

Thanks

Ganesh

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