CapSense Tuner Parameter change

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taas_3144281
Level 5
Level 5
Distributor - Marubun (Japan)
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Hi.

I use PSoC 4100S Plus.

I use CapSense Tuner.

I changed parameters on the tuner.

Sense clock frequency

6000kHz    =>    3000kHz

Then, the signal of the changed button did not rise.

However, this may or may not occur.

It does not occur in our own office, but it occurs in the office we visit.

The evaluation environment is on the desk.

Does the evaluation environment cause these problems?

Kit : CY8CKIT-149

Tool : PSoC Creator4.2

pastedImage_1.png

Sense clock frequency  6000kHz

pastedImage_2.png

Sense clock frequency    3000kHz

1 Solution

Asanuma-san,

Sorry I missed the previous question in response#2.

Jumping cables, especially communication/GND/Power cables may lead to system cp changed.

different desks: non-conductive desk(such as our office desk) is different with metal desks/Labs desk(Labs desks always has a overlay connected with ground for ESD protecton).

Best Regards,

Ryan

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6 Replies
RyanZhao
Moderator
Moderator
Moderator
250 sign-ins First question asked 750 replies posted

Asanuma-san,

The difference could be caused by evaluation environment, test method, or some parameters' changing.

About diff-count(signal) changing, Please refer Equation (1) or (3) in Optimize CapSense CSD Signal in Firmware - KBA226833

Check if any other paras in the equation changed then we can find the possible root cause.

Thanks,

Ryan

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taas_3144281
Level 5
Level 5
Distributor - Marubun (Japan)
25 sign-ins 50 replies posted 25 replies posted

Dear Ryan-san

Thank you for your answer.

Which parameters does the evaluation environment affect?

How is the touch sensor affected when using the board on a desk?

Best Regards,

asanuma

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taas_3144281
Level 5
Level 5
Distributor - Marubun (Japan)
25 sign-ins 50 replies posted 25 replies posted

Dear Ryan-san

 

I could do it without problems at my desk, but on purpose I made the evaluation environment worse.

The touch sensor was put on a plastic bottle and operated.

Changing the clock on Tuner and executing To Device confirmed that the Signal value did not increase.

However, after changing the clock and confirming that Signal did not rise, it was confirmed that pressing the reset button on the evaluation board rise the Signal.

What are the possible causes?

Best Regards,

asanuma

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Asanuma-san,

Have you checked the sensor cp of the sensor?

Before and after clock changed, did the cp change or not, no matter on the desk or on customer side?

Best Regards,

Ryan

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Asanuma-san,

Sorry I missed the previous question in response#2.

Jumping cables, especially communication/GND/Power cables may lead to system cp changed.

different desks: non-conductive desk(such as our office desk) is different with metal desks/Labs desk(Labs desks always has a overlay connected with ground for ESD protecton).

Best Regards,

Ryan

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taas_3144281
Level 5
Level 5
Distributor - Marubun (Japan)
25 sign-ins 50 replies posted 25 replies posted

Dear Ryan-san

Thank you for your answer.

I understand that changes in the evaluation environment cause changes in cp.

I will prepare the evaluation environment to operate CapSense.

Best Regards,

asanuma

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