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PSoC 5, 3 & 1 MCU

Anonymous
Not applicable

Hi,

   

 

   

I'm using the CY8C21534 and have a few questions about the tuning process of the capsense CSD user module. Can someone help me with these?

   

- in the tuning process flowchart ( CY8C21x34/B CapSense® Design Guide page 32 )  it is stated that the SNR should be between 5 and 8. In all other documentation I only found that the minium is 5 with no maximum given. What is the problem if the SNR is higher then 8?

   

- in that same flowchart the Ref Value is set to 2. In what case should this value be changed to an higher value?

   

 

   

Thanks.

   

 

   

Danny

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Yuva
Moderator
Moderator

Hi Danny,

   

If the SNR is above 8 the sensor may be over sensitive and may trigger even if the finger is up a distance. Also it  increases in power consumption. And varying the Ref Value changes the rawcount but generally Rb is changed to tune the rawcount.

   

Thanks,

   

Yuva.

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