Long touch with CY8C20xx7 and SmartSense_EMCPLUS UM

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Anonymous
Not applicable

 Hello,

   

I'm developing a 4 key capsense PCB with CY8C20447S (with shield and guard)

   

I'm testing the SmartSense_EMCPLUS User Module and it works well, but I can't detect a permanent touch (the detection goes OFF after some time, one-two seconds)

   

I'd like to know if it's a limitation of the UM or should I be able to achive a long lasting touch.

   

Thanks.

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ETRO_SSN583
Level 9
Level 9
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Consider posting your project here to be looked at by Forum members.

   

If you are uncomfortable with that extract a subset from project that

   

just covers the problem and post.

   

 

   

Google Chrome is apparently a problem when uploading, use Firefox, IE

   

to post project.

   

 

   

Regards, Dana.

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Anonymous
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 Hi Dana,

   

 

   

thanks for your answer. There's no secret in the implementation: it's an example from the CY8C20xx7_S design guide.

   

Attatched you'll see the schematic.

   

In the next post there's a layout (very similar) to the actual layout.

   

Has anyone used this module with long touchs?

   

Regards

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Anonymous
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Anonymous
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 Here the layout implemented

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Anonymous
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 Hi,

   

Cypress solved my problem in a Case:

   

Please check the autoreset parameter in the UM is enabled or not.If enabled,the baseline will update continuously and make the difference count zero.

   

Thanks

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Hi,

I have same problem. I am working with CY8C20180 Express Cap sense controller.I don't have auto reset enable still after 2 sec baseline will jump to high value and make diff count 0.

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