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Tuning of CY8C21534 CSD user module | Cypress Semiconductor

Tuning of CY8C21534 CSD user module

Summary: 1 Reply, Latest post by Yuva Vignesh Muruganandam on 06 Jan 2016 07:24 AM PST
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DVDBE's picture
11 posts



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?





yuva's picture
Cypress Employee
21 posts

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.



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