Capsense Key sense problem for device CY8C24994

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Capsense Key sense problem for device CY8C24994

Postby anandkalode » Mon Apr 11, 2011 10:45 pm

Dear All,
I am using Cypress device CY8C24994 for sensing 39 keys. I am facing problem to sense all 39 keys.

when i configure device for 27 keys using CSD method. then i can sense 27 keys properly with 3 mm thick acrylic material. As soon as i increase the no of keys form 27 to 28, i can't sense 28th key. i have total 39 keys on my keyboard. when i configure another 27 keys then i can sense another 27 keys without any problem with 3 mm thick resistive material. means my hardware is ok. no issue in hardware.

Another thing is that, when i write a code for 39 keys. without the 3 mm thick resistive material, then i can sense all 39 keys properly.But this dont work with acrylic.

But as soon as i use 3 mm thick resistive material on the keyboard. then i can sense first 27 keys only.

Can anybody please help me. to resolve this problem, and scan all 39 keys with 3 mm thick resistive (acrylic) material.
waiting for reply.

Anand kalode.
Posts: 1
Joined: Mon Apr 11, 2011 10:15 pm

Re: Capsense Key sense problem for device CY8C24994

Postby graaja » Tue Apr 12, 2011 4:01 am

This will need some debugging of the capsense data. If you have the I2C-USB bridge, you can easily analyze the raw counts using the charting tool. In case, you do not have the I2C-USB bridge, then I would suggest you use a TX8SW user module and transmit the data like Raw Counts, Difference Counts etc and observe on Hyperterminal.
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