PSOC 4 waterproof cap touch button size related problem

[LiFi_1601451]

I am using CY8C4125PVS-482Z  for waterproof cap touch button design. It is a single button. The button width and length is 11mm. Cypress cap touch design guide specify that the button to guard clearance should be at lease 10mm and the guard thickness should be 2mm. Because our cap touch button has limited size. Can we reduce the button to guard clearance and reduce the guard thickness. Please recommend a minimum button to guard clearance and minimum guard thickness. Besides, Can we remove the outer shield surrounding the guard ring to reduce the size. What is the negative effect by removing outer shield

[BragadeeshV · Accepted solution]

Hello Lin,

1. We have recommended a clearance of 10 mm between the guard and the sensor just to make sure that you don't accidentally trigger the guard sensor. There is nothing wrong in reducing the clearance, but make sure that you don't trigger the guard sensor while touching the button sensor.

2. Yes, you can also reduce the guard sensor thickness. In that case you need to manually tune your sensor in a suitable manner.

Instead of reducing the clearance and thickness of guard, can you try to reduce the button size? We recommend a minimum button size of 5 mm .

Hope this helps!

Regards,

Bragadeesh